RuPAC2016 - List of Keywords (electron)

Paper	Title	Other Keywords	Page
TUXMH01	The European XFEL - Status and Commissioning	linac, undulator, klystron, operation	11
	H. Weise DESY, Hamburg, Germany
	Funding: The European XFEL is funded by the respective funding agencies of the contributing countries. The European X-ray Free Electron Laser* in Hamburg, Germany, is being constructed by an international consortium. The facility is being built to offer photon beam of highest brilliance at wavelengths down to below 1 Angstrom. The accelerator complex with all its sections, the injector, the 17.5 GeV superconducting linac, bunch compressors, beam distribution systems etc. was built under the leadership of DESY. Seventeen European research institutes contributed to the accelerator complex and to the comprehensive infrastructure. DESY coordinates the European XFEL Accelerator Consortium but also contributes with many accelerator components, and the technical equipment of buildings, with its associated general infrastructure. With the finishing of the accelerator installation in autumn 2016, the first cool-down of the superconducting linac was started. Commissioning is next with the goal to demonstrate first lasing in spring 2017. Users are expected to use the first photon beams in 2017. A project overview and the status will be given illustrating the success of the collaborative work. * http://xfel.eu
	Slides TUXMH01 [48.625 MB]
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TUXMH02	Novosibirsk Free Electron Laser: Terahertz and Infrared Coherent Radiation Source	FEL, radiation, undulator, laser	16
	N.A. Vinokurov, V.S. Arbuzov, K.N. Chernov, I.V. Davidyuk, O.I. Deichuli, E.N. Dementyev, B.A. Dovzhenko, Ya.V. Getmanov, Ya.I. Gorbachev, B.A. Knyazev, E.I. Kolobanov, A.A. Kondakov, V.R. Kozak, E.V. Kozyrev, S.A. Krutikhin, V.V. Kubarev, G.N. Kulipanov, E.A. Kuper, I.V. Kuptsov, G.Y. Kurkin, L.E. Medvedev, S.V. Motygin, V.N. Osipov, V.K. Ovchar, V.M. Petrov, A.M. Pilan, V.M. Popik, V.V. Repkov, T.V. Salikova, M.A. Scheglov, I.K. Sedlyarov, S.S. Serednyakov, O.A. Shevchenko, A.N. Skrinsky, S.V. Tararyshkin, V.G. Tcheskidov, A.G. Tribendis, P. Vobly, V. Volkov BINP SB RAS, Novosibirsk, Russia I.V. Davidyuk, Ya.V. Getmanov, B.A. Knyazev, E.V. Kozyrev, S.S. Serednyakov, N.A. Vinokurov NSU, Novosibirsk, Russia A.G. Tribendis NSTU, Novosibirsk, Russia
	Funding: This work was supported by Russian Science Foundation (project N 14-50-00080). High-power free electron laser (FEL) facility NovoFEL has been created at Budker INP. Its wavelength can be tuned over a wide range in terahertz and infrared spectrum regions. As a source of electron bunches this FEL uses multi-turn energy recovery linac which has five straight sections. Three sections are used for three FELs which operate in different wavelength ranges (the first one - 90-240 microns, the second - 37-80 microns and the third - 5-20 microns). The first and the second FELs were commissioned in 2003 and 2009 respectively. They operate for users now. The third FEL is installed on forth accelerator track which is the last one and electron energy is maximal here. It comprises three undulator sections and 40 m optical cavity. The first lasing of this FEL was obtained in summer, 2015. The radiation wavelength was 9 microns and average power was about 100 watts. The designed power is 1 kilowatt at repetition rate 3.75 MHz. Radiation of third FEL has been delivered to user stations recently. The third FEL commissioning results as well as current status of the first and second FELs and future development prospects are presented.
	Slides TUXMH02 [26.379 MB]
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TUCAMH02	CW 100 mA Electron RF Gun for Novosibirsk ERL FEL	gun, cathode, cavity, radiation	24
	V. Volkov, V.S. Arbuzov, E. Kenzhebulatov, E.I. Kolobanov, A.A. Kondakov, E.V. Kozyrev, S.A. Krutikhin, I.V. Kuptsov, G.Y. Kurkin, S.V. Motygin, A.A. Murasev, V.K. Ovchar, V.M. Petrov, A.M. Pilan, A.V. Repkov, M.A. Scheglov, I.K. Sedlyarov, S.S. Serednyakov, O.A. Shevchenko, S.V. Tararyshkin, A.G. Tribendis, N.A. Vinokurov BINP SB RAS, Novosibirsk, Russia N.A. Vinokurov NSU, Novosibirsk, Russia
	Funding: Grant 14-50-00080 of the Russian Science Foundation Continuous wave (CW) 100 mA electron RF gun for injecting the high-quality 300-400 keV electron beam in Novosibirsk microtron recuperator (ERL) and driving Free Electron Laser (FEL) was developed, built, and commissioned at BINP SB RAS. The RF gun consists of normal conducting 90 MHz RF cavity with a gridded thermionic cathode unit. Bench tests of rf gun is confirmed good results in strict accordance with the calculations. The gun was tested up to the design specifications at a test bench that includes a diagnostics beam line. The rf gun stand testing showed reliable work, unpretentious for vacuum conditions and stable in long-term operation. The design features of different components of the gun are presented. Preparation and commissioning experience is discussed. The beam test results are summarized.
	Slides TUCAMH02 [2.764 MB]
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TUCBMH01	Status of the Kurchatov Synchrotron Light Source	controls, wiggler, synchrotron, vacuum	27
	A.G. Valentinov, A. Belkov, Y.A. Fomin, E.V. Kaportsev, V. Korchuganov, Y.V. Krylov, V.I. Moiseev, K. Moseev, N.I. Moseiko, D.G. Odintsov, S.G. Pesterev, A.S. Smygacheva, A.I. Stirin, V. Ushakov, V.L. Ushkov, A. Vernov NRC, Moscow, Russia
	The Kurchatov synchrotron light source operates in the range of synchrotron radiation from VUV up to hard X-ray. To improve facility capabilities in the last few years technical modernization of all facility systems is underway and new beam lines are constructed. In this report the present status and future plans of the Kurchatov synchrotron light source is presented.
	Slides TUCBMH01 [10.384 MB]
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TUCBMH02	Numerical Analysis of the Effective Width of the Spectrum of Synchrotron Radiation	radiation, polarization, synchrotron, synchrotron-radiation	30
	V.G. Bagrov, A.S. Loginov, A.D. Saprykin Tomsk State University, Tomsk, Russia D.M. Gitman, A.D. Levin IFUSP, Sao Paulo, Brazil
	A notation of an effective spectral width is introduced in the theory of synchrotron radiation, as an exact quantitative characteristic of the spectral properties. Within a classical theory, numerical calculations of the effective spectral width for polarization components of the synchrotron radiation have been carried out (for an effective width exceeding 100 harmonics). It is found how the effective spectral width and the initial harmonic change depending on the energy of the radiating particle.
	Slides TUCBMH02 [0.265 MB]
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WEXMH01	Feeding BINP Colliders with the New VEPP-5 Injection Complex	injection, positron, linac, damping	56
	F.A. Emanov, A.V. Andrianov, K.V. Astrelina, V.V. Balakin, A.M. Barnyakov, O.V. Belikov, D.E. Berkaev, M.F. Blinov, Y.M. Boimelshtain, D. Bolkhovityanov, A.G. Chupyra, N.S. Dikansky, A.R. Frolov, Ye.A. Gusev, G.V. Karpov, A.S. Kasaev, V.I. Kokoulin, A.A. Kondakov, I. Koop, I.V. Kuptsov, G.Y. Kurkin, R.M. Lapik, N.N. Lebedev, A.E. Levichev, P.V. Logatchov, Yu. Maltseva, P.V. Martyshkin, A.A. Murasev, D.A. Nikiforov, A.V. Pavlenko, V.M. Pavlov, A.V. Petrenko, V. Podlevskih, V.V. Rashchenko, S.L. Samoylov, S.V. Shiyankov, A.N. Skrinsky, A.A. Starostenko, D.P. Sukhanov, A.G. Tribendis, A.S. Tsyganov, S.V. Vasiliev, V.D. Yudin, I.M. Zemlyansky BINP SB RAS, Novosibirsk, Russia Yu. A. Rogovsky Budker INP & NSU, Novosibirsk, Russia A.L. Romanov Fermilab, Batavia, Illinois, USA
	VEPP-4 and VEPP-2000 e⁺e⁻ colliders are switching to feed from VEPP-5 Injection Complex via newly constructed K-500 beam transfer line. Since first operation of K-500 at the end of 2015 injection complex delivered e⁺ and e^- beams to VEPP-2000 facility and is getting ready to work with VEPP-4. Upgraded injection chain demonstrated ability to provide design luminosity toVEPP-2000 and techniques of reliable operation are now under development. The designand operation experience of Injection Complex and transfer lines will be presented.
	Slides WEXMH01 [6.228 MB]
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WECAMH04	Recent Experiments With High Energy Electron Cooler in COSY	proton, target, experiment, storage-ring	67
	V.B. Reva, M.I. Bryzgunov, V.V. Parkhomchuk, D.N. Skorobogatov BINP SB RAS, Novosibirsk, Russia V. Kamerdzhiev FZJ, Jülich, Germany I.N. Meshkov JINR, Dubna, Moscow Region, Russia
	The 2 MeV electron cooling system at COSY-Jülich started operation in 2013. The cooling process was observed in the wide energy range of the electron beam from 100 keV to 1.26 MeV. Vertical, horizontal and longitudinal cooling was obtained with bunched and coasting proton beam. This report deals with electron cooling experiments at COSY with proton beam at energy 1.66 and 2.3 GeV. The proton beam was cooled at different regimes: RF on and off, barrier bucket RF, and cluster target on and off.
	Slides WECAMH04 [11.045 MB]
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WECBMH01	First Cold Tests of the Superconducting cw Demonstrator at GSI	cavity, linac, ion, cryomodule	83
	F.D. Dziuba, M. Amberg, K. Aulenbacher, W.A. Barth, V. Gettmann, M. Miski-Oglu HIM, Mainz, Germany M. Amberg, M. Basten, M. Busch, H. Podlech, M. Schwarz IAP, Frankfurt am Main, Germany K. Aulenbacher IKP, Mainz, Germany W.A. Barth, M. Heilmann, S. Mickat, S. Yaramyshev GSI, Darmstadt, Germany W.A. Barth, S. Yaramyshev MEPhI, Moscow, Russia
	The future experimental program of super heavy element synthesis at GSI desires high intense heavy ion beams at or above the coulomb barrier, exceeding the capabilities of the GSI-UNILAC (Universal Linear Accelerator). Additionally, the existing GSI accelerator chain will be used as an injector for FAIR (Facility for Antiproton and Ion Research) primarily providing high power heavy ion beams at a low repetition rate. Due to this limitations a new dedicated superconducting (sc) continuous wave (cw) linac is proposed to keep the Super Heavy Element (SHE) research program at GSI competitive. The construction of the first linac section has been finished in the 3rd quarter of 2016. It serves as a prototype to demonstrate its reliable operability in a realistic accelerator environment. This demonstrator cryomodule comprises the sc 217 MHz crossbar-H-mode (CH) multigap cavity as the key component of the whole project and two sc 9.3 T solenoids. The performance of the cavity has been extensively tested at cryogenic temperatures. In this contribution the measurement results of initial cold tests will be presented.
	Slides WECBMH01 [4.677 MB]
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WECDMH01	Commissioning of High Efficiency Standing Wave Linac for Industrial Applications	klystron, gun, high-voltage, power-supply	99
	A.N. Ermakov, A.S. Alimov, V.V. Khankin, L. Ovchinnikova, N.I. Pakhomov, N.V. Shvedunov, V.I. Shvedunov SINP MSU, Moscow, Russia A.S. Alimov, A.N. Ermakov, V.V. Khankin, V.V. Klementiev, L. Ovchinnikova, N.I. Pakhomov, Yu.N. Pavshenko, N.V. Shvedunov, V.I. Shvedunov, A.S. Simonov LEA MSU, Moscow, Russia
	We present the results of the commissioning of the pulsed linear electron accelerator with beam energy of 10 MeV, developed with the participation of scientists and engineers of the SINP MSU, LEA MSU Ltd. and JSC "RPE "Toriy". The source of RF power for accelerator is a multibeam klystron KIU-147A operating at 2856 MHz with pulse output power 6 MW and an average power of 25 kW. As a result of commissioning we received at the output of accelerator scanning system an electron beam with an energy of 10 MeV and an average power of more than 15 kW. Capture ratio and electronic efficiency of 1.24 m long accelerating structure are greater than 65%.
	Slides WECDMH01 [7.123 MB]
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WECDMH03	A 5 to 20 MeV Electron Linear Accelerator for Metrology	radiation, vacuum, shielding, target	102
	Yu. Zuev, Z. Andreeva, M.A. Kalinichenko, A.P. Klinov, A.S. Krestianinov, O.L. Maslennikov, A.V. Tanchuk, V.V. Terentyev NIIEFA, St. Petersburg, Russia S.G. Trofimchuk, I.I. Tsvetkov VNIIM, St.Petersburg, Russia
	The paper outlines design parameters and construction features of an electron linear accelerator to be operated in the D.I.Mendeleyev Institute for Metrology (VNIIM). The accelerator system is intended to form electron and bremsstrahlung radiation fields of variable intensity. This shall extend characteristics of the National measurement standard to be used for calibration of a space monitoring equipment, embedded measuring means for industrial accelerator facilities and others. The accelerator system consists of an electron source, resonance accelerating structure, beam-bending magnet'separator and radiation head with a block of bremsstrahlung targets, foils and collimators. An important feature of the system is spatial steadiness of radiation field at energies varied from 5 to 20 MeV and more than tenfold variation of the accelerated particle current. The status of the project will be presented as well.
	Slides WECDMH03 [9.654 MB]
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THCAMH02	Electron Accelerators Series ILU and Prospects of Their Application in the Food Industry	radiation, acceleration, operation, high-voltage	108
	V.O. Tkachenko, V.V. Bezuglov, A.A. Bryazgin, B.L. Faktorovich, V.A. Gorbunov, M.V. Korobeynikov, V.E. Nekhaev, A.D. Panfilov, V.M. Radchenko, E.A. Shtarklev, A.V. Sidorov, A. YU. Vlasov, L.A. Voronin BINP SB RAS, Novosibirsk, Russia
	The report describes a series of industrial accelerators type ILU. Lists their basic parameters and characteristics. Presents data on their application in the cable industry, medicine and other fields. Reports on experiments with food products. Discusses the new features and technologes of the application of accelerators ILU in the food industry. Discusses problems in the Russian legislation related to the treatment of foodstuffs by ionizing radiation.
	Slides THCAMH02 [37.047 MB]
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THZMH01	SC and HTS-related Activity at IHEP	dipole, quadrupole, solenoid, superconductivity	128
	S. Kozub, A.I. Ageev, I. Bogdanov, E. Kashtanov, V.A. Pokrovsky, P.A. Shcherbakov, L.S. Shirshov, V.I. Shuvalov, I. Slabodchikov, V. Sytnik, L. Tkachenko, O.V. Trusov, S. Zinchenko IHEP, Moscow Region, Russia
	The SC program at IHEP of NRC Â“Kurchatov InstituteÂ” has been developed intensively in the 1980ies in the framework of the UNK project. More than a hundred of models of the SC magnets of various designs, and then the pilot batch consisting of 25 full-scale dipoles and 4 quadrupoles have been designed, manufactured and tested at IHEP. Two SC magnetic systems of Electron Lens for the Tevatron collider were developed, manufactured, shipped and successfully brought into operation. Development of fast-cycling SC magnets for the FAIR project is discussed. Racetrack coils from HTS-2G tape for electrical machines that were developed, manufactured and tested are reported. Test and trial results with HTS dipole magnets employing Bi2223 as well as second-generation HTS are also reviewed.
	Slides THZMH01 [6.546 MB]
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THCDMH02	Recent Optimized Design of ILC Cryomodule With Explosion Welding Technology	niobium, cryomodule, linear-collider, collider	141
	B.M. Sabirov JINR, Dubna, Moscow Region, Russia
	Primary purpose of this experiment is the development of techniques to simplify and make cheaper the construction of the cryomodules. In the current ILC TDR design the helium vessel and the connected pipes are made of expensive titanium. JINR in association with INFN several designs for these transitions have been produced and studied during the last years. The results of measuring microhardness by Vickers microindentation are issued of ~3.8 GPa and the breaking strength was 375 MPa. Helium leak measurements revealed no leaks at a background leak rate of 0.410^-10 atmcc/s. For imitation of use transition sample in real working position, connected with Nb cavity, Nb rings were joint with Nb pipe of samples by EBW. Superposition of all residual stresses may result plastic deformation, failure of welds, and consequently occurrence of a leak. Test result of thermocycles in LHe and in the LN ussued absence of leak at background leak rate ~0.510^-10 atmcc/sec. The results showed the full eligibility of suggested design Nb+Ti+SS transition sample not for only Linear Collider, but for any cryogenic systems.
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TUCASH02	Commissioning and First Tests of the New Standing Wave 10 Mev Electron Accelerator	linac, simulation, coupling, site	173
	S.M. Polozov, D.B. Bazyl, T.V. Bondarenko, M. Gusarova, Yu.D. Kliuchevskaia, M.V. Lalayan, V.I. Rashchikov, E.A. Savin MEPhI, Moscow, Russia M.I. Demsky, A.A. Eliseev, V.V. Krotov, D.E. Trifonov CORAD Ltd., St. Petersburg, Russia
	A new linear electron accelerator for industrial applications was developed by the joint team of CORAD and MEPhI. It is based on conventional biperiodical accelerating structure for energy range from 7.5 to 10 MeV and beam power up to 20 kW. The use of modern methods and codes for beam dynamics simulation, raised coupling coefficient and group velocity of SW biperiodic accelerating structure allowed to reach high pulse power utilization and obtain high efficiency. The first two accelerators with the new structure have been installed and tested.
	Slides TUCASH02 [4.924 MB]
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TUCASH06	Progress in CW Mode Electron Resonance Accelerator BETA-8 Development	cavity, resonance, operation, power-supply	185
	A.V. Telnov VNIIEF, Sarov, Russia
	This paper presents the status of powerful linear electron accelerator BETA-8 development. The accelerator is operating in CW mode and used for ionizing radiation research. The basic constituent of accelerator is coaxial half-wave resonator excited on T1 wave. Required electron beam energy is attained by multiple passing through central transversal plane of resonator. Electron beam iterative passing is realized by turning magnets located on resonator outwalls. The main parameters of the accelerator are: beam output energy 1.5 - 7.5 MeV, average power up to 300 kW, operating frequency 100 MHz. By now the main components of facility, namely, coaxial resonator, three HF generator units each with output power 180 kW, HF power summation device, the unit of power input (UPI) designed to transfer HF signal of 600 kW have been designed and manufactured. Electron beam transport system project consisting of up to five full sequential passes through accelerating resonator has been developed. Turning electromagnets have been designed and manufactured. HF parameters measurements for coaxial resonator assembled with UPI have been realized at low HF power level. All HF generator units and HF power summation devices have been tested. HF electron injector has been designed, manufactured and tested. The accelerator testing is supposed to be carried out in one HF generator unit supply mode.
	Slides TUCASH06 [2.798 MB]
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TUCASH07	HF Structure of BETA-8 Electron Resonance Accelerator	cavity, resonance, feedback, coupling	188
	M.L. Smetanin VNIIEF, Sarov, Russia
	BETA-8 is new powerful resonance electron accelerator designed in RFNC-VNIIEF to operate in continuous wave generating regime. The basic constituent of accelerator is half-wave coaxial resonator excited at T1 wave. The work presents the main approaches to numerical modeling of accelerator HF power system components. The results of computation of accelerating resonator with operating frequency of 100 MHz and inductive unit of HF power input (UPI) designed to transmit continuous HF signal at operating frequency with mean power level of 600 kW are reported. The transmitting coaxial waveguide connecting UPI with feeding HF generator has been computed, designed and manufactured. The calculated results have been tested by measurements of HF parameters of the resonator assembled with UPI and connecting waveguide. The possibility to locate indicating loop (a detector working in frequency feedback circuit of feeding HF generator) in transmitting feeder has been demonstrated. The method of calibration computation of measuring inductive loop that is an element of amplitude feedback circuit of HF generator is presented. The dual matched load necessary for preliminary adjustment of operating modes of feeding HF generator unit (with mean power up to 180 kW) and technological systems of accelerating complex has been computed, designed and put into operation.
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THXSH02	Three Transverse Deflecting Systems for Electron Beam Diagnostics in the European Free-Electron Laser XFEL	klystron, controls, diagnostics, high-voltage	196
	A.A. Zavadtsev RAS/INR, Moscow, Russia
	Funding: European XFEL GmbH, Ministry of Education and Science of Russia In frames of Russian in-kind contribution to Europe-an XFEL, INR in cooperation with DESY is responsible for Transverse Deflecting Systems (TDS) for special beam diagnostic in the XFEL linac. Three TDS have been developed: TDS INJ in the Injector, TDS BC1 in the Accelerator tunnel after Bunch Compressor 1 and TDS BC1 after Bunch Compressor 2. Each system in-cludes S-band disk-loaded deflecting structure (DLS), waveguide system, klystron, pulse transformer, modu-lator and control system. TDS INJ has been built, as-sembled in the Injector building and tested. It is used to monitor the bunch length, longitudinal phase space and slice emittance now. Exceptionally small, exceed-ing expectations, slice emittance of electron bunch was measured using TDS INJ during the XFEL Injector commissioning. Three structures for TDS BC1 and TDS BC2 as well as the waveguide systems have been built, tested and TDS BC2 part installed in the XFEL tunnel. On behalf of the joint XFEL TDS team
	Slides THXSH02 [16.400 MB]
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THCBSH01	INR RAS Instrumentation for Bunch Shape and Beam Cross-Section Monitoring	linac, diagnostics, ion, operation	204
	S.A. Gavrilov, A. Feschenko, P.I. Reinhardt-Nickoulin RAS/INR, Moscow, Russia
	Instruments for bunch shape and beam cross-section diagnostics at ion linacs are as important as complicated devices. Widespread Bunch Shape Monitors developed in INR RAS are used during a linac commissioning and optimization of beam dynamics. Beam Cross-Section Monitors implemented at INR RAS linac provide efficient non-destructive beam tuning and control. Features of both monitors investigated in simulations and beam tests are described. A variety of experimental results are presented.
	Slides THCBSH01 [12.054 MB]
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TUPSA006	Development of RF Accelerator on Parallel-Coupled Structure - Trend in Accelerator Technique	cavity, focusing, coupling, acceleration	219
	Y.D. Chernousov ICKC, Novosibirsk, Russia
	Development of parallel-coupled accelerating structure (PCS), creation of RF linier accelerator based on PCS is new and rapidly developing field of accelerator technology. Compared with conventional accelerating structures with serial communication - the standard traveling and standing waves structures, the PCS has a lot of features and advantages. There are many problems in the development of RF linear accelerators: breakdowns at high power levels, the destruction of the structure due to overheating, the excitation of higher-order mode, the decline of field strength along the structure, transients, beam loading, beam focusing, multipactor, radiation accelerator cleanliness, etc. PCS - the best accelerating structure for solving these problems.
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TUPSA007	New Experimental Results on RF Accelerator with Parallel-Coupled Structure and RF Controlled Gun	injection, gun, focusing, cavity	222
	Y.D. Chernousov ICKC, Novosibirsk, Russia I.M. Ikryanov, I.V. Shebolaev ICKC SB RAS, Novosibirsk, Russia
	New data on the development and experimental investigation of the RF accelerator based on the 9-cavities parallel-coupled accelerating structure that is equipped with a high-frequency grid-controlled electron gun are presented. Accelerating structure, injection system and focusing system are improved. Previously observed second emission resonant discharge - multipactor is suppressed by increasing the field amplitude in the structure first cavity and using the protector. The parameters of the accelerated beam close to the design ones, i.e. electron energy up to 8 MeV, capture to the acceleration mode up to 100%, were received. Capture is provided by the RF electron focusing of the microwave field structure with usage of the magnetic focusing system based on permanent magnets and RF grid control in the electron gun.
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TUPSA009	Electron Beam Dynamics Calculation and Accelerating Structure Geometry Design in 10 MeV Hybrid Electron Linac	linac, focusing, coupling, beam-loading	228
	A.V. Bulanov, S.V. Matsievskiy, E.A. Savin, N.P. Sobenin MEPhI, Moscow, Russia
	Electron linear accelerators with an energy of 10 MeV are widely used for industrial purposes. This article presents the electron dynamic calculations and the design of linac with a standing wave (SW) buncher based on the biperiodic accelerating structure and a constant impedance backward traveling wave (BTW) accelerating section after it. In such accelerator, all unused RF power coming out from BTW section is used in SW section to improve the linac efficiency. Thus no RF load is needed. Also, a beam is experiencing an RF focusing in the SW buncher. Solenoid focusing field influence on the beam dynamics in the TW section was studied.
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TUPSA010	Electron Linear Accelerator with the Variable Energy from 6 to 11 MeV	linac, gun, klystron, focusing	231
	A.V. Bulanov, E.A. Savin, N.P. Sobenin MEPhI, Moscow, Russia A.V. Gryzlov TORIY, Moscow, Russia
	The standing wave accelerator with the variable energy from 6 to 11 MeV has been designed. Electron energy is controlled by the injected current. The buncher has been designed to provide capture above 70% for the all injected currents range. The possibility of using a permanent radially magnetized toroidal magnet for the beam focusing was studied.
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TUPSA012	Superconducting Stored Energy RF Linac as Free Electron Laser Driver	cavity, FEL, linac, laser	237
	V.G. Kurakin, P.V. Kurakin LPI, Moscow, Russia
	Due to cavity losses in multi pass free electron laser (FEL), generation starts in it from definite threshold of driving electron beam current. Depending on generation wave range the threshold current strikes from fraction of ampere to dozens of amperes. In order to rich laser saturation, from hundreds to thousands electron bunches are required. Simple estimations give the value from units up to tens joules of bunches train energy in order to rich FEL saturation for infrared wave range (approximately 20 - 25 MeV of bunches energy and 3 A of pick current, bunch length being 1 cm). A beam with parameters mentioned might be obtained in rf superconducting linac operating in stored energy mode. The advantage of such approach is simplified linac power supply since dozens watts cw rf generator is required only to rich necessary accelerating voltage. At the same time the energy spread arising from beam loading may be compensated by additional cavities exited at shifted frequencies. In this paper Maxwell equations are used for beam-cavity interaction analysis. The bunch energy loss or the same the voltage induced by radiating bunch is expressed in terms of cavity external parameters. The detailed analysis of beam energy spread compensation is carried out followed by an example showing the reality of FEL schema suggested.
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TUPSA018	Experimental Facility for E-Beam Irradiation Test of Prototype IF Target in RISP	target, controls, vacuum, radiation	253
	V. Gubin Institute of Laser Physics, SB RAS, Novosibirsk, Russia I. Chakin, S. Fadeev, M. Golkovsky, Yu. Maltseva, P.V. Martyshkin BINP SB RAS, Novosibirsk, Russia J.Y. Kim, J.-W. Kim, Y.H. Park IBS, Daejeon, Republic of Korea
	Nowadays project RISP is developed in IBS, Daejeon. One of the main project devices is graphite targets system meant for production of rare isotopes by means of the in-flight fragmentation (IF) technique. The power inside the target system deposited by the primary beam with energy of 200 MeV/u is estimated to be around 100 kW. The target represents rotating multi-slice graphite disc cooled by thermal radiation. Necessary step of the target development is integrated test of target prototype under high power electron beam modelling real energy deposit into target. This test is planned to be held in BINP, Novosibirsk, with the use of ELV-6 accelerator. This paper presents the design of experimental facility as well as experimental program of test. Specifications of electron beam (energy close to 800 keV, size ~ 1mm, total power 30-40 kW) are discussed. Parameters and design of basic devices and systems of facility are described.
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TUPSA019	Upgrade of the RF System on the LUE-200	klystron, linac, rf-amplifier, neutron	256
	K.I. Mihailov JINR/FLNP, Moscow Region, Russia E.A. Golubkov, V. Kobets, A.N. Repkin, A.P. Sumbaev JINR, Dubna, Moscow Region, Russia V.M. Pavlov BINP SB RAS, Novosibirsk, Russia
	In the report works on upgrade of RF system of the LUE-200 (IREN) electron linac are provided. The main attention is paid to system of preliminary excitement of klystrons. After work on installation of the second accelerating section RF system of Installation it was considerably remade that allowed to carry out start-up of the second stage of the IREN installation successfully. Methods, features and problems in case of a training of two accelerating sections are discussed. Influence of the temperature and frequency modes on joint operation of accelerating sections. Results of setup of the RF system and a training of sections, and also results of posting of a bunch are given.
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TUPSA020	Installation for the Research of Z-Pinch Plasma Initiated by the Electron Beam	plasma, focusing, gun, luminosity	258
	A.A. Drozdovsky, A.V. Bogdanov, S.A. Drozdovsky, R. Gavrilin, A.V. Kantsyrev, V.A. Panyushkin, I. Roudskoy, S.M. Savin, V.V. Yanenko ITEP, Moscow, Russia P.V. Sasorov Keldysh Institute of Applied Mathematics, Moscow, Russia V.V. Yanenko MEPhI, Moscow, Russia
	For researches on plasma physics has been designed and constructed the electronic gun with the cold cathode on energy to 300 keV. The gun have the parameters: time width of pulses -100 ns, current amplitude - 100 A. The adiabatic plasma lens is developed for transportation and compression of the received electron beam. Results of researches are presented.
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TUPSA030	Regulation of the Waveguide Coupling Factor of Standing Wave Linear Accelerator	coupling, resonance, insertion, cavity	279
	D.S. Yurov MSU, Moscow, Russia V.I. Shvedunov LEA MSU, Moscow, Russia V.I. Shvedunov SINP MSU, Moscow, Russia
	Regulation of the waveguide coupling factor of standing wave linear accelerator allows to adjust the value of accelerated current, keeping the reflected RF power close to zero. This ensures the most efficient use of RF energy and absence of overvoltage in the waveguide elements. The paper presents studies results for various methods of coupling factors regulation with continuous wave (CW) normal conducting linear accelerator used as an example. The results of calculations and measurements on the mock-up of the accelerating structure are presented.
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TUPSA035	Estimation of Multipacting in CDS Structure	multipactoring, simulation, cavity, coupling	288
	I.V. Rybakov RAS/INR, Moscow, Russia I.I. Isaev DESY Zeuthen, Zeuthen, Germany
	The Cut Disk Structure (CDS) is recommended for replacement of the first cavity of the main part of INR linac. For the cavity work stability there should be no multipactor at operating regime. CDS structure was first set on exploitation at DESY PITZ electron linac. For this cavity according to the analytical estimation multipaction should appear at the operating power level in coupling cells, but it was not approved by the numerical simulation with both accelerating and coupling modes excitation for RF energy transfer along the cavity. The multipactor appears only with the secondaty emission yield (SEY) growth which could happen if the inner surface of the cavity is polluted. The results of multipactor investigation in CDS PITZ were used as reference for the CDS structure for the first cavity of the main part of INR linac. The analytical estimation and numerical simulation of multipactor in CDS INR structure shows the appearance of the discharge in coupling cells with the OFC copper SEY for the operating regime of the cavity. An option for the multipactor damping with the forced excitation of oscillations in coupling cell with voltage higher than upper multipactor limit was considered.
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TUPSA040	S-Band Choke Mode Cavity for Low Energy Storage Ring	cavity, HOM, storage-ring, scattering	300
	L. Ovchinnikova, V.I. Shvedunov SINP MSU, Moscow, Russia A. Ryabov IHEP, Moscow Region, Russia V.I. Shvedunov LEA MSU, Moscow, Russia
	Several variants of a low-energy storage ring for Thomson scattering X-ray source were considered in . The most promising variant "C" of the ring with small dimensions and large dynamic aperture has also large momentum compaction factor, which would lead to too long bunches with RF cavity operating at 714 MHz, so shorter wavelength must be used. In this paper we present results of optimization of S-band double-cells cavity with parasitic mode damping by chokes similar to . Interaction of the bunch circulating in the ring with cavity parasitic modes is simulated. L. Ovchinnikova, V. Shvedunov, A. Mikhailichenko et al.. A comparative study of low energy compact storage rings for a thomson scattering x-ray source. Proc. of IPAC-16, 2016, pp. 3308-3310. ** T. Shintake, The Choke Mode Cavity, Jpn. J. Appl. Phys, Vol. 31,1992, pp. L1567-L1570, No. 1lA
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TUPSA041	High-Energy Micro-Buncher Based on the mm-Wavelength Dielectric Structure	proton, wakefield, plasma, quadrupole	303
	A.V. Petrenko CERN, Geneva, Switzerland I.L. Sheinman LETI, Saint-Petersburg, Russia
	The proton-driven plasma wakefield acceleration is a recently proposed technique promising a GeV/m rate of acceleration to a TeV-scale energy in a single plasma stage. In order to excite high-amplitude plasma wakefields a long proton bunch from a synchrotron should be broken into a sequence of sub-mm long micro-bunches which can drive the plasma oscillations resonantly. We suggest a novel approach to produce the required train of micro-bunches using collinear wakefield acceleration in a dielectric-loaded structures. First the energy modulation is introduced into the proton beam with the help of the mm-wavelength dielectric accelerating structure. Then the energy modulation is transformed into the longitudinal micro-bunching using proton beamline with magnetic dipoles. Beam dynamics simulations were used to find the appropriate parameters of the dielectric accelerating structure, driving electron bunch and the beam focusing system.
	Poster TUPSA041 [0.792 MB]
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TUPSA042	Software Complex "Dynpart" for the Calculation of Self-Consistent Beam Dynamics in Dielectric Wakefield Accelerating Structures	wakefield, acceleration, focusing, software	307
	I.L. Sheinman, A.E. Yakushkin LETI, Saint-Petersburg, Russia
	Dielectric waveguide structures are a basis for development of new generation of accelerators on the basis of a wakefield method of the charged particle acceleration, beam manipulation, and also free electron lasers. A self-coordinated dynamics of relativistic particle beams in a single layer cylindrical waveguide with dielectric filling is investigated. The computer code is developed based on mathematical expressions for the analysis of the radial dynamics. The possibility of modeling interaction of different types of particles in a bunch is realized. Influence of both own wake fields and external fields of focusing and deflection systems on bunch dynamics are analyzed.
	Poster TUPSA042 [0.860 MB]
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TUPSA043	Wake Field Components in a Rectangular Accelerating Structure With Dielectric Anisotropic Loading	wakefield, acceleration, radiation, accelerating-gradient	310
	I.L. Sheinman, Yu.S. Sheinman LETI, Saint-Petersburg, Russia
	Dielectric lined waveguides are under extensive study as accelerating structures that can be excited by electron beams. Rectangular dielectric structures are used both in proof of principle experiments for new accelerating schemes and for studying the electronic properties of the structure loading material. Some of the materials used for the waveguide loading of accelerating structures possess significant anisotropic properties. General solutions for the fields generated by a relativistic electron beam propagating in a rectangular dielectric waveguide have been derived using the mode expansion method for the transverse operators of the Helmholtz equation. An expression for the combined Cherenkov and Coulomb fields obtained in terms of a superposition of LSM and LSE-modes of rectangular waveguide with anisotropic dielectric loading has been obtained. Numerical modeling of the longitudinal and transverse (deflecting) wakefields has been carried out. It is shown that the dielectric anisotropy influences to excitation parameters of the dielectric-lined waveguide with the anisotropic loading.
	Poster TUPSA043 [1.334 MB]
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TUPSA050	Electron Beam Stability in the Energy Recovery Linac for the Lithographic Free Electron Laser	linac, cavity, undulator, radiation	319
	Ya.V. Getmanov, O.A. Shevchenko, N.A. Vinokurov BINP SB RAS, Novosibirsk, Russia N.A. Vinokurov NSU, Novosibirsk, Russia
	According to microelectronic production leaders the lithography based on the free electron laser (FEL) could become the main technology for the elements mass production with scale to 5 nm in the nearest future. One of the main problem is the absence of the working FEL with required parameters. The feasibility study of those FEL based on superconducting energy-recovery linac (ERL) was made in Budker INP. The ERL average current is limited by longitudinal and transverse instabilities, caused by interaction between electron beam and its induced fields in the superconducting cavities. The estimations of the threshold currents and ERL parameters were made.
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TUPSA051	Form-factor Determination of an Arbitrary Bunch Sequence for the Coherent Radiation Calculation	radiation, factory, target, diagnostics	322
	D.A. Shkitov, A.E. Harisova TPU, Tomsk, Russia
	It is well known that the coherent effect occur when charged particles in a bunch radiate in phase. This is accompanied by a quadratic increase in the radiation intensity and significantly influences the radiation spectrum. The coherent radiation is characterized by a form factor, which is the coefficient mainly depending on the ratio of bunch dimensions to the observed radiation wave length. The form factors will be different for the synchrotron and transition radiation because of their different nature of radiation. Now electron accelerators that produced beams with a sub-picosecond bunch length and a picosecond distance between them already exist. Through the appearance of interference between radiation from such a sequence of bunches, the total intensity is no longer equal to the sum of radiation from each bunches. For this reason, it is essential to determine the form factor of an arbitrary electron bunch sequence. Herein the uniform bunch distribution will be the special case. In this report we describe an approach to obtaining the form factor of the arbitrary bunch sequence.
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TUPSA052	First Order Perturbation Theory Evaluation of Initial Stage of Self Amplified Crystal-Based X-Ray Emission	radiation, electromagnetic-fields, resonance, undulator	325
	A.I. Benediktovitch BSU, Minsk, Belarus, Belarus
	X-ray Free Electron Lasers open new revolutionary opportunities for investigations in materials science, chemistry, biology and other areas. However, due to high cost of construction and maintain, the access to these facilities for wide scientific community is quite limited. This motivates search for schemes of compact bright x-ray sources. The size of X-ray Free Electron Lasers is dictated by basic properties of undulator radiation: to produce x-rays with Angstrom wavelength from cm period undulator one needs electrons with energy in GeV range. If one considers the radiation mechanisms accompanying the propagation of electron beam through a crystal structure (channeling radiation, parametric x-ray radiation, Cherenkov radiation near K-edge), one can see that to get photons in x-ray range one needs electrons with energy of tens to hundreds MeV. One of the ways to get bright x-ray source based on crystal-assisted radiation mechanisms is to run the electrons in coherent radiation regime based on self amplified spontaneous emission (SASE). In the present contribution we will discuss under which conditions the SASE can start in the case of crystal-assisted radiation mechanisms. To investigate the initial stage of SASE process we use the first-order perturbation theory that enables to describe the collective beam response as effective susceptibility. Based on this approach we will analyze which experimental geometry would promising for the SASE process onset.
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TUPSA062	Modeling of Triode Source of Intense Radial Converging Electron Beam	cathode, target, plasma, simulation	336
	V.V. Altsybeyev, V.I. Engelko, A.D. Ovsyannikov, D.A. Ovsyannikov, V.A. Ponomarev Saint Petersburg State University, Saint Petersburg, Russia R. Fetzer, G. Müller KIT, Karlsruhe, Germany
	The considered source of triode type produces intense radial converging electron beam for irradiation of cylindrical targets. As an electron emitter an explosive plasma cathode is used. The role of initial transverse velocities of electrons, defocusing effect of the controlling grid, the beam self-magnetic field, electron and ion emission from the controlling grid, backscattering of electrons and ion flow from the target is analyzed. Conditions for achieving required electron beam parameters (the electron kinetic energy - 120 keV, the beam energy density on the target 40 J/cm² on a maximum possible length of the target surface) were determined.
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TUPSA063	The Electron Trajectories Construction in the System With a "Real" Geometry of the Field Cathode	cathode, controls, synchrotron, neutron	339
	A.Yu. Antonov St. Petersburg State University, St. Petersburg, Russia M.I. Varajun LETI, Saint-Petersburg, Russia
	The problems of the trajectories constructing for field electrons and emission images simulation are considered. As an approximation of the emitter shape an explicitly and implicitly defined surfaces are selected. Hyperboloidal, ellipsoidal and paraboloidal models are studied. Also an equipotential surface of the charged sphere-on-orthogonal-cone system is used. A simple solution of the field distribution problem is allowed to formulate the Cauchy problem for the motion equations. The shape of the anode (the projector microscope screen) can be selected in any desired form. Achieving a screen by electrons is performed with dense output technique in numerical approach to the solution. The distribution of the work function on the cathode surface is obtained. The trajectories for the projection of the field emission activity as the image are used.
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TUPSA064	The Infinitely Thin Field Emitter Mathematical Modeling	cathode, vacuum, electronics	342
	E.M. Vinogradova Saint-Petersburg State University, Saint-Petersburg, Russia N.V. Egorov St. Petersburg State University, St. Petersburg, Russia E.V. Kalaturskaja Saint Petersburg State University, Saint Petersburg, Russia
	In this work an axisymmetric diode electron-optical system based on a field emitter is simulated. The field emitter in the form of a thin filament of finite length is located on the flat substrate with the dielectric layer. The anode is a plane. The electrostatic potential distribution was found in an analytical form - in the form of Fourier-Bessel series in the whole area of the system under investigation. The coefficients of Fourier-Bessel series are the solution of the system of linear equations with constant coefficients.
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TUPSA068	Simulation of S-Band RF Gun with RF Beam Control	cavity, cathode, gun, controls	345
	A.M. Barnyakov, A.E. Levichev, D.A. Nikiforov BINP SB RAS, Novosibirsk, Russia M.V. Maltseva NSU, Novosibirsk, Russia
	The design and operation of electron RF gun with RF beam control are described. Results of numerical simulation of electromagnetic fields and beam dynamics are presented. RF gun consists of two resonators operating at E010 mode with 180 degrees phase shift at frequency of 2856 MHz. RF control is carried out via coaxial resonator with grid-cathode capacity. Accordint to result of the simulation, RF gun with RF control allows producing electron bunches with duration of 50 ps, energy of about 3 MeV and the energy spread of about 5%.
	Poster TUPSA068 [0.996 MB]
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WEPSB004	The Intelligent Object-oriented Interface in the Design Environment of The Charged Particles Relativistic Beams Transport Channels	focusing, quadrupole, interface, software	357
	G.P. Averyanov, V.A. Budkin, A.V. Kobylyatskiy, I.O. Osadchuk MEPhI, Moscow, Russia
	The effectiveness of the design during the computer modeling is significantly determined by the user interface convenience of the application package and the time adaptation of the user to that application. This paper presents a new approach in the implementation of KATRAN software interface for the transport channels design of the charged particles relativistic beams. The interface is a sequence of operations for the designer during the virtual channel creation ' setting beam parameters at the channel input, the choice of the displayed elements of the channel, the channel assembly, setting the calculation algorithm with the parameters optimization. Thus the immersion of the designer into the details of the computing environment, the features of the software and channel modeling mathematical methods is not needed. The data objects are the typical elements of the transport channels (quadrupole lenses, magnets, open intervals, etc.). The work is carried out in interactive mode. After the "build and run" of the channel is finished, the full-screen multi-factor analysis of all major parameters of the beam and channel transparency is provided.
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WEPSB006	On Modeling and Optimization of Intense Quasiperiodic Beam Dynamics	controls, klystron, bunching, simulation	363
	I.D. Rubtsova St. Petersburg State University, St. Petersburg, Russia
	The paper is devoted to quasiperiodic beam dynamics investigation. Particle density is modeled by trigonometric polynomial. Space charge field is represented in the similar form. This approach is applied to beam dynamics investigation in klystron-type buncher. Numerical algorithm of polynomial coefficients calculation from the positions and impulses of model particles is formalized. As a result Coulomb field intensity is expressed in the form of integral over the set of particle phase states. Integro-differential beam evolution model is presented. Analytical expression of the variation of beam dynamics quality criterion is obtained. It makes possible directed methods using for beam dynamics optimization.
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WEPSB007	On Application of Monte Carlo Method for Poisson Problem Solving	controls, lattice, simulation, plasma	367
	L.V. Vladimirova, I.D. Rubtsova St. Petersburg State University, St. Petersburg, Russia
	The paper presents the application of random grid walk for Dirichlet problem solving for Poisson equation. Boundary value problem is discretized and reduced to the system of linear algebraic equations. The matrix of this system is used for stochastic matrix constructing. Thus, there is a possibility of Markov chains obtaining. The special random value is defined on Markov chain trajectories; this value is used for approximation of the desired solution. The advantages of this method are discussed in the paper. The algorithm is applied for electric potential calculation in the cell of support lattice of exit window in large-aperture electron accelerator.
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WEPSB008	About Behavior of Electrons and Ions in the Accelerating Interval	ion, plasma, acceleration, vacuum	371
	A.S. Chikhachev Allrussian Electrotechnical Institute, Moskow, Russia H.Y. Barminova MEPhI, Moscow, Russia
	The behavior of electron-ion ensemble accelerated in the diode is studied. Hot electrons are described by means of the distribution function which is a solution of the collisionless kinetic function depending not only from integrals of motion. To describe the cold ions the hydrodynamics equations are used. The possibility of the ion-sound velocity excess of the ions is shown. The expression for the electron gas pressure is received. The dependence of relative density of the ions on the coordinate is discussed in the case of closed phase trajectories.
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WEPSB009	The Behavior of Powerful Relativistic Electron Beam With Elliptical Cross-Section in Longitudinal Magnetic Field	emittance, quadrupole, cathode	373
	A.S. Chikhachev Allrussian Electrotechnical Institute, Moskow, Russia H.Y. Barminova MEPhI, Moscow, Russia
	The behavior of relativistic intense electron beam with elliptical cross-section moving in a longitudinal magnetic field is investigated with the help of self-consistent model. The solutions for the beam envelopes are obtained in the case of the beam current differed from Alfven limit and the beam charge neutralized. The conditions of stationary beam propagation are determined, however it is discovered that for the case of non-zero self-consistent magnetic field the stationary beam propagation is violated, the partial emittance oscillations being observed. The found time- dependence of the partial emittances and the beam envelopes illustrates the effect of emittance transfer caused by the coupled particle motion in magnetic field.
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WEPSB013	On Approach for Resonant Frequency Tuning in Drift Tube Structures on the Designing Stage	cavity, simulation, controls, target	386
	I. Skudnova, V.V. Altsybeyev Saint Petersburg State University, Saint Petersburg, Russia
	Current research considers the interdigital H-mode linear resonant accelerator with drift tubes mounted inside the cavity. The focus of the study has been on the dependence of resonant frequency on the parameters of the geometry. Since Alternating-Phase-Focusing (APF) type of accelerator is investigated, the efficiency of the operation depends on the synchronization of the charged particle velocity and accelerating field oscillations. Researchers can control it by the variation of longitudinal size of the cells of the structure (periods). On the other hand, the effective performance of the resonant system requires the equality of resonant frequencies of its cells, because it affects the uniformity of accelerating field distribution along the axis. The diversity of cells longitudinal sizes causes the deviation from the particular value of the resonant frequency. This aberration can be eliminated by the adjustment of other geometry parameters: period's length, gap ratio and drift tube diameter. We have conducted the study to analyze the relation between resonant frequency and these values. Using the this dependency we can tune the geometry parameters of each period in the structure. We first create the computer-aided design (CAD) geometry model of the accelerator cavity. Then, using Comsol Multiphysics, the platform for physics-based modeling and simulation, we conduct the calculation of resonant frequencies.
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WEPSB016	Coupled Bunch Instabilities in the Storage Rings	impedance, wakefield, storage-ring, synchrotron	395
	A.S. Smygacheva, Y.A. Fomin, V. Korchuganov NRC, Moscow, Russia
	Funding: The reported study was funded by RFBR according to the research project No. 16-32-00335 mol_a. Coherent instabilities of the bunched beam are one of the reasons that limit a total beam current in the storage rings. Although there are solutions of this problem, the estimation and reduction of wake-fields influence on the longitudinal beam dynamics remain important things. In the article we return to the subject of coherent instabilities of the unevenly-filled bunches in the storage rings.
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WEPSB018	Beam Dynamics Calculation of Electron Bunch Sequence Passing Through Dielectric	radiation, focusing, wakefield, quadrupole	401
	A. Altmark LETI, Saint-Petersburg, Russia A. Kanareykin Euclid TechLabs, LLC, Solon, Ohio, USA
	Funding: Grant 15-02-08745 from the Russian Foundation for Basic Research. The present work involves modeling the electron beams dynamics for development of new THz source based on cylindrical dielectric waveguide. The sequence of relativistic electron bunch generates Cherenkov radiation, which is a superposition of the TM and HEM-modes. The distances between bunches is selected for creating of monochromatic THz radiation. We made calculation of beam dynamics taking into account the Space Charge and focusing field with help of original BBU 3000 code. We present result for different parameters of waveguide and different offsets of bunches. The main parameter of radiation was investigated: length of wave pocket, monochromaticity and frequency. Altmark A, Kanareykin A. The source of THz radiation based on dielectric waveguide excited by sequence of electron bunches// 2016 J. Phys.: Conf. Ser. 732 012037
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WEPSB020	On a New Approach for Description of Self-Consistent Distributions for a Charged Particle Beam	distributed, operation, linac, synchrotron	407
	O.I. Drivotin, D.A. Ovsyannikov St. Petersburg State University, St. Petersburg, Russia
	The present report is concerned with the problem of particle phase space distributions for a charged particle beam. A new approach is presented. It provides the possibility to specify various coordinates in the phase space. The main attention has been focused on the case where motion integrals are taken as phase coordinates. Using such coordinates, one can obtain a lot of self-consistent distributions. Some distributions for a breathing beam are considered as examples: generalized Brillouin flow, generalized KV distribution, and others. Besides, this approach allows simple graphical representation of various self-consistent distributions.
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WEPSB032	Numerical Analysis of Cavity Mode Operation and Electron Beam Dynamics in Lebedev Institute Microtron	microtron, cavity, operation, simulation	428
	V.S. Dyubkov, Y.A. Bashmakov, Y. Lozeev MEPhI, Moscow, Russia Y.A. Bashmakov LPI, Moscow, Russia
	Dynamics of electrons in classic microtron is studied. 3D cavity model is developed and electromagnetic field distribution is simulated. Dependence of output beam parameters on microtron operation mode is investigated and discussed.
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WEPSB035	Model of the Optimal Parameters Choice for the Charged Particles Beam	controls, focusing, hadron, hadrontherapy	437
	S.A. Nemnyugin, O.A. Malafeyev Saint Petersburg State University, Saint Petersburg, Russia
	Problem of the optimal parameters choice for the charged particles beam is considered. The beam is characterized by the set of control parameters and multiple parameters which characterize its quality. So multiple criteria of optimization should be taken into account. Among possible criteria of optimization following ones should be mentioned: energy, intensity, biological efficiency and so on. It is assumed that in general case choice of the control parameters which is optimal for all criteria is not possible. The problem is formulated as the conflict control problem. The case is considered when parameters which should be optimized forms the vector. Finding of the compromise solution is considered. The method and computing algorithms are proposed. Present work is further extension of . G. V. Alferov, O. A. Malafeyev, S. A. Nemnyugin. Charged Particles Beam Focusing with Uncontrollable Changing Parameters // 2014 2nd International Conference on Emission Electronics, Proceedings, 2014. P. 25-27.
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WEPSB036	Gold Ions Beam Losses at the Nuclotron Booster	booster, ion, vacuum, beam-losses	440
	A.V. Philippov, A. Tuzikov JINR/VBLHEP, Dubna, Moscow region, Russia
	The calculation results of the gold ions beam losses along the Nuclotron Booster perimeter are given. The presented results take the ion stimulated desorption from the cold surface of the vacuum chamber and collimation of charge-exchanged gold ions into account.
	Poster WEPSB036 [1.919 MB]
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WEPSB039	New Techniques for Operation and Diagnostics of Relativistic Electron Coolers	photon, laser, solenoid, scattering	449
	J. Dietrich, M.W. Bruker, A. Hofmann, E. Riehn, T. Weilbach HIM, Mainz, Germany K. Aulenbacher, W. Klag IKP, Mainz, Germany M.I. Bryzgunov, V.V. Parkhomchuk, V.B. Reva BINP SB RAS, Novosibirsk, Russia
	The Helmholtz Institut Mainz (HIM) performs experiments related to possible improvements of high-energy d.c.-electron coolers. Results and activities concerning non-invasive beam diagnostics and beam control at large operating currents will be shown. Furthermore, progress of our project to use turbo generators as a means for potential-free power generation in high-energy electron coolers is presented.
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WEPSB040	Commissioning of the 60 keV Electron Cooler for the NICA Booster	vacuum, cathode, ion, booster	452
	A.V. Bubley, M.I. Bryzgunov, A.P. Denisov, A.D. Goncharov, V.M. Panasyuk, V.V. Parkhomchuk, V.B. Reva BINP SB RAS, Novosibirsk, Russia
	The 60 keV electron cooler for the NICA booster was designed and constructed at BINP SB RAS. The article describes results of various measurements obtained during its commissioning. Also some details of design and construction of the cooler are discussed.
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WEPSB042	Commissioning of Electron Cooling Devices at HIRFL-CSR	ion, experiment, operation, high-voltage	458
	X.D. Yang, G.H. Li, J. Li, X.M. Ma, L.J. Mao, M.T. Tang, T.L. Yan IMP/CAS, Lanzhou, People's Republic of China
	Funding: National Natural Science Foundation of China, NSFC Grant No. 11375245 Electron cooling plays an important role in the Heavy Ion Research Facility of Lanzhou cooler storage ring(HIRFL-CSR). Two electron coolers were equipped in main ring(CSRm) and experimental ring(CSRe) in HIRFL-CSR respectively. Two electron cooling devices have commissioned for twelve years since they were installed and completed in 2004. The function and operation procedure of electron cooler were presented in this report. Their performance and the highlights of experiments results were described. Their commission and optimization were summarized here. The issues and troubles during the commission were enumerated and collected in this presentation. The future upgrade and improvement were suggested, and the new operation scenario and requirement were proposed.
	Poster WEPSB042 [0.902 MB]
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WEPSB057	Beam Dynamics in New 10 Mev High-Power Electron Linac for Industrial Application	simulation, gun, linac, bunching	493
	S.M. Polozov, V.I. Rashchikov MEPhI, Moscow, Russia M.I. Demsky CORAD Ltd., St. Petersburg, Russia
	Beam dynamics simulation in electron gun, bunching and accelerating cells of new 10 Mev high-power electron linac was fulfieled with the help of developed at MEPhI SUMA * and BEAMDULAC-BL ** codes. Three-electrode electron gun was used to obtain up to 400-450 mA of pulse beam current which is necessary to produce 300 mA of the accelerated beam. Precise gun simulation was conducted to satisfy all necessary output beams characteristics, such as profile, energy spectrum, phase space size etc. Some additional calculation was conducted to provide wide range of gun output beam parameters which will be used for subsequent accelerator modification. The conventional biperiodical accelerating structure based on disk loaded waveguide was used in linac. Beam dynamics optimization was pointed to obtain effective beam bunching for all energy range and to achieve narrow energy spectrum. Simulation results shows that linac provides effective beam bunching and acceleration for wide bands of beam currents and energies. * V.I. Rashchikov, PAST, Series: Nuclear Physics Investigations, 10 (18), p.50, 1990 ** T.V. Bondarenko et al. PAST, Series: Nuclear Physics Investigations, 6 (88), p. 114, 2013
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WEPSB059	Realization of Positron Annihilation Spectroscopy at LEPTA Facility	positron, detector, ion, radiation	496
	K. Siemek, V.I. Hilinov, P. Horodek JINR/DLNP, Dubna, Moscow region, Russia E.V. Ahmanova, M.K. Eseev, A.G. Kobets, I.N. Meshkov, O. Orlov, A.A. Sidorin JINR, Dubna, Moscow Region, Russia M.K. Eseev NAFU, Arkhangelsk, Russia A.G. Kobets IERT, Kharkov, Ukraine
	Positrons are used in materials science to study open volume defects. Several positron annihilation spectroscopy (PAS) techniques exist. These methods are based on detection of the 511 keV gamma quantum. The first method is the analysis of the Doppler broadening of annihilation line and provide information about defect concentration. Both annihilation quanta can be observed. Coincidence observation of two quanta gives additional information about the environment around defect. The second method is based on lifetime concept, which allows to distinguish type of defects. Nowadays, positron beams are of great interest for materials science. Using a low energy, monoenergetic beam it is possible to control the positron penetration depth from the sample surface to a depth of several microns. Thus, the beam can be used to characterize thin films, analysis of surface modification, studying influence of ions on matter etc. This report aims to present a current status of realization and progress in PAS methods at LEPTA facility at JINR.
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WEPSB060	Development of Positron Annihilation Spectroscopy at the LEPTA Facility	positron, target, acceleration, cryogenics	499
	A.A. Sidorin, E.V. Ahmanova, M.K. Eseev, A.G. Kobets, I.N. Meshkov, O. Orlov JINR, Dubna, Moscow Region, Russia M.K. Eseev NAFU, Arkhangelsk, Russia V.I. Hilinov, P. Horodek, I.N. Meshkov, K. Siemek JINR/DLNP, Dubna, Moscow region, Russia P. Horodek, K. Siemek IFJ-PAN, Kraków, Poland A.G. Kobets IERT, Kharkov, Ukraine
	The report aims to present the status of the development of the LEPTA facility for further enhancement of the positron annihilation spectroscopy (PAS) method application at the LEPTA facility. The research in solid state physics performed currently is based on slow monochromatic positron flux from the injector and Doppler PAS. The new positron transfer channel being under construction at the LEPTA allows us to develop more advanced PAS method - so called 'Positron Annihilation life-time spectroscopy' (PALS). It will enrich significantly the research program at the LEPTA. PAS method is sensitive to microdefects in solids. A pair of gamma quanta, born as a result of positron-electron annihilation carries information about the density of the defects that have the size less than 10 nm and are located at the depth from the surface of the material depending on the positron energy. New monochromatic positron source construction supplied with the autonomous cooling system with emitter-source of the activity of 30 mCi (iThemba LABS production) and new positron transfer channel are presented in report.
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WEPSB064	Modifications of Electron Linear Accelerators Produced in NIIEFA for Sterilization	gun, klystron, focusing, vacuum	505
	Yu. Zuev, A.P. Klinov, A.S. Krestianinov, O.L. Maslennikov, V.V. Terentyev NIIEFA, St. Petersburg, Russia
	The paper analyses a series of electron linear accelerators equipped with one and the same accelerating structure. The structure operates in the standing-wave mode at a frequency of 2856 MHz. The accelerators differ in type and duty cycle of RF generators, electron sources, beam extraction and scanning devices and in configuration and layout of their auxiliary equipment. These modifications can provide the beam energy of 8-10 MeV and beam power up to 10^-12 kW. Facilities with the accelerating structure have been used for electron beam sterilization of medical disposables and food processing over ten years.
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WEPSB068	Radiation From Open-Ended Flanged Waveguide With Dielectric Loading	simulation, vacuum, radiation, extraction	515
	V.V. Vorobev, S.N. Galyamin, A.A. Grigoreva, A.V. Tyukhtin Saint Petersburg State University, Saint Petersburg, Russia
	Funding: The work is supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grants from Russian Foundation for Basic Research (No. 15-32-20985, 15-02-03913). Terahertz radiation is considered as a promising tool for a number of applications. One possible way to emit THz waves is to pass short electron bunch through a waveguide structure loaded with dielectric. Previously we considered the extraction of radiation from the open end of the waveguide with dielectric loading in both approximate and rigorous formulation. We also developed a rigorous approach based on mode-matching technique and modified residue-calculus technique for the case when the waveguide with dielectric is co-axial with infinite waveguide with greater radius. The study presented is devoted to the case when the dielectric loaded waveguide has a flange and enclosed into another waveguide with a greater radius. The case of the flanged waveguide in the unbounded vacuum space can be described as the limiting case of the problem under consideration. We perform analytical calculation (based on mode-matching technique and modified residue-calculus technique) and direct numerical simulation.
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WEPSB069	Radiation of a Bunch Flying from the Open End of a Waveguide with a Dielectric Loading	radiation, simulation, vacuum, electromagnetic-fields	518
	S.N. Galyamin, A.V. Tyukhtin, V.V. Vorobev Saint Petersburg State University, Saint Petersburg, Russia A. Altmark, S. Baturin LETI, Saint-Petersburg, Russia
	Funding: Work is supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grant from Russian Foundation for Basic Research (No. 15-32-20985). In this paper we proceed with our investigation of Terahertz emission from beam moving in waveguide structures with dielectric layer. Recently we have considered an open-ended waveguide (with uniform dielectric filling) placed inside regular vacuum waveguide of a larger radius and excited by a single incident waveguide mode. Here we present analytical results for the case where the structure is excited by a moving charge. We also perform simulations using CST® PS code and compare results. S.N. Galyamin, A.V. Tyukhtin, S.S. Baturin, S. Antipov, Opt. Express 22(8) 8902 (2014). ** S.N. Galyamin, A.V. Tyukhtin, S.S. Baturin, V.V. Vorobev, A.A. Grigoreva, in Proc. IPAC'16, pp. 1617-1619.
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THPSC001	The Multipole Lens Mathematical Modeling	multipole, vacuum, cathode, controls	535
	E.M. Vinogradova Saint-Petersburg State University, Saint-Petersburg, Russia A.V. Starikova Saint Petersburg State University, Saint Petersburg, Russia
	In the present work the mathematical model of the multipole system is presented. The multipole system is composed of arbitrary even number of the uniform electrodes. Each of the electrodes is a part of the plane. The potentials of the electrodes are the same modulus and opposite sign for neighboring electrodes. The variable separation method is used to solve the electrostatic problem. The potential distribution is represented as the eigen functions expansions. The boundary conditions and the normal derivative continuity conditions lead to the linear algebraic equations system relative to the series coefficients.
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THPSC003	The Design of Permenant Magnet Spread System for 0.5 MeV Irradiation Accelerator	permanent-magnet, high-voltage, dipole, radiation	541
	J. Huang, Q.S. Chen, K. Fan, M. Fan, W. Qi, Y.Q. Xiong, J. Yang, L.G. Zhang HUST, Wuhan, People's Republic of China T. Yu, C. Zuo Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
	Funding: Supported by Natural Science Foundation (11505068) The traditional electron beam scanning magnet has many disadvantages, for example, the regulatory of excitation current is very complex and the irradiation uniformity as well as the irradiation area is very difficult to improve and expand. Thus the author of the paper proposes an innovative technology of a permanent magnet spread system for 10 MeV irradiation accelerator which uses a special configuration of the magnetic field to spread electron beam bunch directly and would remarkably improve the spread uniformity, simplify the accelerator and would be helpful to protect the titanium window and expand the irradiation area. Also, the technology could as well be used on the electron beam irradiation of those irregular structured objects of large size.
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THPSC008	Magnetic Systems for Beam Transport at Extraction Channels of ILU Accelerators	extraction, focusing, radiation, dipole	556
	V.V. Bezuglov, A.A. Bryazgin, B.L. Faktorovich, E.N. Kokin, V.E. Nekhaev, A.D. Panfilov, V.M. Radchenko, E.A. Shtarklev, V.O. Tkachenko, A. YU. Vlasov, L.A. Voronin BINP SB RAS, Novosibirsk, Russia
	This paper is devoted to magnetic systems for beam transport at extraction channels of electron industrial accelerators of the ILU type. The extraction systems meant for energy of the accelerated electrons up to 10 MeV and beam power up to 100 kW are described. The analysis of their work subject to the processes connected with the induced eddy currents in metal walls of beam scanning chambers is made; special attention is paid to forming of the dose field in a radiation zone. In paper the magnetic system for bending of the nonmonochromatic beams is offered to application. The essence of the described device consists in application of two identical magnetic mirrors in which distribution of magnetic field on depth is formed so that natural rise of magnetic field intensity on an entrance to a mirror is followed by decrease of this field under a certain law. In the issue of impact on charged particles of forces arising in cylindrical lenses of each mirror is possible to compensate angular divergence of strongly nonmonochromatic beams in gaps of magnetic mirrors and to receive after bending a beam with parameters close to phase characteristics of an input beam. The design procedure of such bending device and a general view of installation for experimental check of the offered bending system on electron beam are given in this paper.
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THPSC017	A Synchrotron Radiation Beamline Installed at BINP to Study the High Luminosity LHC Vacuum System	photon, vacuum, radiation, synchrotron	572
	A.A. Krasnov, V.V. Anashin, A.M. Semenov, D.B. Shwartz BINP SB RAS, Novosibirsk, Russia V. Baglin, P. Chiggiato, B. Henrist CERN, Geneva, Switzerland D.B. Shwartz NSU, Novosibirsk, Russia
	In the framework of the HL-LHC project, the vacuum performance of new surface material needs to be studied. In particular, a-C coating is proposed as an anti-multipactor surface in the HL-LHC Inner Triplets. Since the protons in the HL-LHC Inner Triplets will generate synchrotron radiation (SR) with ~ 10 eV critical energy and ~ 10¹⁶ ph/m/s flux, it is therefore of great importance to study the impact of such photons on a-C coating held at room and cryogenic temperature and compare the results against present LHC material. This paper describes construction and parameters of experimental set-up based on new Synchrotron Radiation beamline from booster synchrotron BEP at BINP. The experimental program releasing in collaboration between CERN and BINP for performing measurements of photon stimulated gas desorption, photon distribution and photo-electron emission provoked by synchrotron radiation are presented
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THPSC019	Hardware for Increasing Reliability of the Power Supply System for Corrector Magnets of the European XFEL	power-supply, operation, controls, monitoring	578
	O.V. Belikov, V.R. Kozak, E.A. Kuper, A.S. Medvedko BINP SB RAS, Novosibirsk, Russia H.-J. Eckoldt, N. Heidbrook DESY, Hamburg, Germany
	The total length of European X-ray Free-Electron Laser (XFEL) tunnels is 5,77 km. There are used about 300 corrector magnets for tuning electron beam. Every corrector magnet is fed by separate power supply. Power supplies for corrector magnets are distributed in 6 halls. So, replacing of one failed power supply produced too long pause in facility operations. The paper discussed different solutions which allow increasing reliability of corrector magnet power supply system for European XFEL.
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THPSC021	Corrector magnet power supplies of the European XFEL	power-supply, feedback, experiment, hardware	584
	O.V. Belikov, V.R. Kozak, A.S. Medvedko, D.N. Skorobogatov, R. Vahrushev BINP SB RAS, Novosibirsk, Russia H.-J. Eckoldt, N. Heidbrook DESY, Hamburg, Germany
	In 2016 the testing of the first section of the particle accelerator for the European X-ray Free-Electron Laser (XFEL) was completed and the results were excellent. BINP take anticipation in many works of XFEL construction. One of these works is developing, production, system assembling and putting in operation the power supply system for corrector magnets. Since 2012 there were developed, produced and delivered to XFEL 7 models of power supplies with up to 10 A output current and up to 70 V output voltage. Total quantity of delivered power supplies is near 400 pieces. The report presents the structure of power supply system and results of testing.
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THPSC023	Automated System for Precision Current Sources Testing	software, controls, real-time, free-electron-laser	589
	E.V. Bykov, A.M. Batrakov, O.V. Belikov, Ye.A. Gusev, V.R. Kozak BINP SB RAS, Novosibirsk, Russia
	The system of beam correction for European XFEL includes about 400 precise current sources. Before including in XFEL equipment the every current source must tested and verified in concordance with specifications. For this purpose there was developed the automated system allowing to test up to 7 current sources simultaneously. The system consists of stand and software that written for linux OS. The stand was equipped by test loads, which emulated the real load, by precise DCCT and by precise analog-to-digital converters with CANbus interface. During testing the current in each current source was changed and digitized in concordance with different algorithms. The duration of typical session was 25 hours. The specific software was developed for this stand. It provides testing process, collecting and storing the primary information and displaying the first information. There are addition utilities which allows to make different analyzes in off-line mode using data accumulated during tests. The article provides a detailed description of the stand and main results.
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THPSC025	Generator of High-Voltage Pulse for High-Current Accelerator of Deuteron With Laser Starts	laser, plasma, high-voltage, cathode	594
	E.D. Vovchenko, A.A. Isaev, K.I. Kozlovskiy, A.E. Shikanov MEPhI, Moscow, Russia
	The report deals with the source of pulsed high voltage, and simultaneously, source of the pulsed current for the magnetic insulation of electrons near the cathode that was developed for a high-current accelerator of deuterons with laser-plasma anode. The accelerating voltage up to 400 kV and ion current about 1 kA have been achieved. The current in the spiral inductor has reached 4 kA and it excludes breakdown between the cathode and anode for 0.5 mks. For synchronization of physical processes in accelerator of deuterons with pulsed power, the laser control is applied.
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THPSC027	Solid-State Modulators for Particle Accelerators	klystron, linac, controls, high-voltage	600
	A.A. Zavadtsev, D. Churanov, D.A. Zavadtsev, D.A. Zybin Nano, Moscow, Russia
	A series of the wide parameter range solid-state high-voltage modulators has been developed and built as a power supplies for the magnetrons and the klystrons in the particle accelerators. The series includes 60 kV/100 A/6 μs modulator with pulse transformer for 3 MW magnetron, 60 kV/300 A/6 μs direct switch modulator for 6 MW multi-beam klystron, 110 kV/80A/6 μs direct switch modulator for 3 MW klystron, 130 kV/100 A/6 μs modulator with pulse transformer for 5 MW klystron, 250 kV/250 A/6 μs modulator with pulse transformer for 20 MW klystron. The last modulator is under construction. All other modulators have been supplied to customers in Russia as well as in Europe.
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THPSC029	300 kV High-Voltage Source With Up to 15 kW Output Power	high-voltage, controls, operation, interface	606
	D.V. Senkov, I.A. Gusev, A.Yu. Protopopov, D.N. Pureskin, M.A. Scheglov BINP SB RAS, Novosibirsk, Russia
	The presented report contains the description of high-voltage source with output voltage up to 300 kV and output current up to 50 mA. The source consist of the chopper with IGBT switches working with a principle of pulse-width modulation and the full H-bridge converter with IGBT switches, both working on programmed from 15 to 25 kHz frequency, and the high voltage transformer powering the eight-stage multiplier with the additional capacity filter at output. The transformer and multiplier both are made in common volume separated on oil tank part with silicon oil for transformer and SF6 part for multiplier. The additional capacity filter provides low ripple and noise level in working range of output currents. The source can operate in normal mode with series of high-voltage breakdown in output voltage. In the high-voltage breakdown the released in load and matching circuit energy is less than 40 J at maximum operating voltage 300kV. The efficiency of system is more than 80% at the nominally output power 15 kW. The description of the source and the test results are presented.
	Poster THPSC029 [1.218 MB]
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THPSC030	High-Precision Ramped High-Voltage Source With Up to 50 kV Output Voltage	high-voltage, feedback, booster, interface	609
	D.V. Senkov, A.M. Batrakov, I.A. Gusev, A.Yu. Protopopov, A.A. Zharikov BINP SB RAS, Novosibirsk, Russia
	This report describes the precision high-voltage ramped high-voltage power system. The output voltage up to 50 kV with 10 ppm precision. The power system consists of the 3 kW high-voltage source based on multiplier, presision high-voltage divider with digital interface and high-voltage discharge switch to provide low ramp-down time for output voltage. The power system is planed to use in the NIKA booster electron cooler project. The description and test results are presented.
	Poster THPSC030 [1.985 MB]
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THPSC033	Obtainment of 5 mA 2 MeV Proton Beam in the Vacuum Insulation Tandem Accelerator	ion, proton, vacuum, tandem-accelerator	618
	I.M. Shchudlo, D.A. Kasatov, A.M. Koshkarev, A.N. Makarov, Y.M. Ostreinov, I.N. Sorokin, S.Yu. Taskaev BINP SB RAS, Novosibirsk, Russia
	Funding: The study was supported by the grants from the Russian Science Foundation (Project No.14-32-00006), Budker Nuclear Institute and Novosibirsk State University In BINP the neutron source for BNCT based on proton accelerator was designed and built. It is necessary for the therapy to ensure a stable proton beam current of not less than 3 mA with energy 2 MeV. During the injection of negative hydrogen ion beam into the accelerator the unwanted charged particles are produced, affecting the stability of beam parameters. The article describes meth-ods of suppression of undesirable charged particles and the results of experiments.
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THPSC037	Loss Analysis of Insulated Core Transformer High Voltage Power Supply	high-voltage, power-supply, radiation, electronics	620
	Y.F. Zhang, J. Huang, M.K. Li, H. Liang, W. Qi, Y.Q. Xiong, J. Yang, L.G. Zhang, C. Zuo HUST, Wuhan, People's Republic of China T. Yu Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
	Insulated core transformer (ICT) electron accelerator is an ideal prototype in low energy radiation processing industry, and ICT high voltage power supply is the essential apparatus. Conventional ICT high voltage power supply uses laminated silicon steel sheets as magnetic cores and works at 50 Hz. In a novel design of the ICT high voltage power supply, the magnetic cores made of ferrite material are adopted to increase the frequency and improve the performance. Focusing on the new scheme, the loss calculation of the high voltage power supply was carried out. The loss of ferrite magnetic cores and the windings was analysed and simulated.
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THPSC038	A Novel Design of Insulated Core Transformer High Voltage Power Supply	power-supply, high-voltage, controls, software	623
	M.K. Li, K. Fan, M. Fan, J. Huang, H. Liang, W. Qi, Y.Q. Xiong, J. Yang, L. Yang, L.G. Zhang, Y.F. Zhang, C. Zuo HUST, Wuhan, People's Republic of China T. Yu Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
	Insulated core transformer (ICT) high voltage power supply is an ideal model for industrial radiation accelerator at energy below 1MeV. Compared to the traditional scheme, a novel ICT high voltage power supply was put forward. Conventional silicon steel sheets were replaced with manganese zinc ferrites, raising working frequency from 50Hz to thousand hertz. Magnetic structure was changed from three-phase structure to four-phase structure. Accordingly, excitation voltage was changed from three-phase sinusoidal wave to square wave. Polyimide was chosen as insulation material instead of teflon or mica. A prototype of 400kV/50mA was designed, simulated and verified with the aid of finite element analysis software. To optimize the voltage distribution, corresponding flux compensation methods were raised to solve the problem of flux leakages.
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THPSC043	Series Magnetic Measurements Of NICA Booster Dipoles	dipole, booster, coupling, quadrupole	629
	V.V. Borisov, A.V. Bychkov, A.M. Donyagin, O. Golubitsky, H.G. Khodzhibagiyan, S.A. Kostromin, M.M. Omelyanenko, M.M. Shandov JINR, Dubna, Moscow Region, Russia A.V. Shemchuk JINR/VBLHEP, Dubna, Moscow region, Russia
	NICA booster magnetic system consists of 40 dipole and 48 quadrupole superconducting (SC) magnets. Measurement of magnetic field parameters is assumed for each booster magnets. At the moment six series dipole magnets are assembled and have passed all tests. Booster dipole magnets are 2.14 m-long, 128 /65 mm (h/v) aperture magnets with design similar to Nuclotron dipole magnet but with curved (14.1 m radius) yoke. They will produce fields up to 1.8 T. The magnetic field parameters will be measured at "warm" (300 K) and "cold" (4.5 K) conditions. The obtained results of magnetic measurements of first five magnets are summarized here.
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THPSC046	High-Power High-Temperature Graphite Beam Dump for E-Beam Irradiation Test of Prototype IF Target in RISP	target, simulation, scattering, experiment	632
	V. Gubin Institute of Laser Physics, SB RAS, Novosibirsk, Russia J.Y. Kim, J.-W. Kim, Y.H. Park IBS, Daejeon, Republic of Korea Yu. Maltseva, P.V. Martyshkin BINP SB RAS, Novosibirsk, Russia
	Nowadays project RISP is developed in IBS, Daejeon. One of the main project device is graphite target system meant for production of rare isotopes by means of the in-flight fragmentation (IF) technique. The power inside the target system deposited by the primary beam with energy of 200 MeV/u is estimated to be around 100 kW. The target represents rotating multi-slice graphite disc cooled by thermal radiation. Necessary step of target development is integrated test of target prototype under high power electron beam modelling real energy deposit into target. This test is planned to be held in BINP, Novosibirsk, with the use of ELV-6 accelerator. Heavy-ion beam will be modelled by the e^- beam of ELV-6 accelerator with diameter down to ~1 mm and energy 800 keV (minimum possible). IF target is not full stopping target for an electron beam with energy 800 keV. Considerable part of beam energy will be not absorbed by a target material and must be deposited into special beam dump. In this paper the design of beam dump of the graphite cone geometry cooled by thermal irradiation is described.
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THPSC047	A Faraday Cup for a Low Charge LWFA Electron Beam Measurement	laser, simulation, acceleration, plasma	635
	V. Gubin, V.I. Trunov Institute of Laser Physics, SB RAS, Novosibirsk, Russia V.V. Gambaryan, A.E. Levichev, Yu. Maltseva, P.V. Martyshkin, A.A. Pachkov, S.N. Peshekhonov BINP SB RAS, Novosibirsk, Russia
	Nowadays laser wakefield acceleration (LWFA) is considered as one a perspective method for GeV electron beam production. Combination of laser accelerated electrons and Compton backscattering of probe light beam opens possibility to create the table top source of femtosecond light beam in x-ray and gamma range. Project of laser-driven Compton light source started in ILP SB RAS in collaboration with BINP SB RAS. Production of 1-10 pC electron beams sub-ps time range duration with energies up to 100 MeV is expected as a result of the first stage of the project. Since energy of electrons does not exceed of 100 MeV, it allows using Faraday cup (FC) with reasonable dimensions, instead of commonly used integrating current transformer (ICT). Geometry of FC was optimized taking into account of beam stopping simulation as well as low capacity requirement. RF properties, simulation of the system operation were carried out. System has been tested at the VEPP-5 electron linac. Results of development and testing of this FC are presented.
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THPSC048	Measurement of Gamma Beams Profile by Cherenkov Radiation in Fibers	radiation, photon, experiment, betatron	638
	A.V. Vukolov, A.I. Novokshonov, A. Potylitsyn, E. Shuvalov, S.R. Uglov TPU, Tomsk, Russia
	Funding: This work was partially supported by the Russian Ministry of Education and Science within the program 'Nauka' Grant 3.709.2014/K and by RFBR Grant 15-52-50028-YaF_a. Results of gamma beam profile experimental investigations by measuring of Cherenkov radiation* generated in a fiber with 0.6 mm thickness and in a glass rod with 5 mm diameter are presented. These experiments were carried out on bremsstrahlung beam of the linear accelerator 'Philips SL-75' with 6 MeV energy and 4 Gr/min dose rate at 1 m distance. In works and * authors have showed feasibility of Cherenkov radiation applying for high energy beam diagnostics. In our work the Cherenkov radiation yield dependence on the fiber orientation relative to the beam axis was investigated and showed that the maximal light yield corresponds to the angle between fiber and beam axes closed to the Cherenkov angle. When dose rate is higher than 1 Gr/min at 1 m distance one can register a light yield for the fiber orientation even less than Cherenkov angle. We suppose that the observed effect is connected with generating of electromagnetic shower by initial photons. Proposed technique of bremsstrahlung and electron **** beams profile measurements differs from well-known techniques based on ionization chambers due to its insensitive to low energy part of the bremsstrahlung spectrum and to undesirable background. Using this technique for beam profile scanning it is possible to construct compact and noise insensitive device relative to the well-known systems. It is also possible to reach submillimeter resolution with this device. * Jelley J V, Cherenkov Radiation and its Application, 1958, Pergamon Press. Wulf F, Korfer M, Proc. of DIPAC 2009, p. 411. * A. Murokh, R. Agustsson etc., Proc of IPAC2012, p.996. **** A V Vukolov, A I Novokshonov, A P Potylitsyn, S R Uglov, Proc of RREPS-15, 2015, Sain-Petersburg
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THPSC051	The Magnetic Energy Analyzer for Electron Beam Of LUE-200 Linac of IREN Facility	detector, vacuum, target, linac	647
	A.P. Sumbaev, V.I. Shokin, N.I. Tarantin JINR, Dubna, Moscow Region, Russia
	Theses for a base substantiation, results of the calculation for the electron optical parameters and design features of the magnetic energy analyzer for the beam of the electron LUE-200 linac are presented. The static dipole magnet with homogeneous transverse field and with a combined functions (the functions of a spectrometer and of a spectrograph) established after the second accelerating section, allows to spend measurements in a wide energy range of the analyzed particles up to 224 MeV with the instrumentation resolution not worse ± 5 %.
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THPSC052	The Longitudinal Broadband Impedance and Energy Spread Measurements at VEPP-4M	impedance, synchrotron, damping, scattering	650
	V.M. Borin, V.A. Kiselev, G.Y. Kurkin, O.I. Meshkov, S.A. Nikitin, M.A. Skamarokha BINP SB RAS, Novosibirsk, Russia V.L. Dorokhov BINP, Novosibirsk, Russia
	The paper presents studies of the longitudinal broadband impedance of VEPP-4M and measurements of its bunch energy spread at different energies in range of 1.45 - 3.5 GeV. In order to measure the longitudinal bunch size at different currents we used PS-1/S1 streak camera with picosecond temporal resolution. Considering that influence of collective effects is negligible at low currents we determined bunch energy spread from its length at low currents. Collected bunch length data demonstrate microwave instability thresholds and potential well distortion lengthening. Potential well distortion was studied at 3 GeV and 3.5 GeV. Measured potential well distortion lengthening was used to estimate a value of the reactive part of the longitudinal impedance. Observed microwave instability thresholds was used to measure the value of broadband impedance. Measured value of the VEPP-4M is 7.9 ± 1.5 Ohm.
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THPSC055	Electrodynamic Characteristics of RF-Deflector for Bunch Shape Monitor	simulation, cavity, impedance, insertion	659
	D.A. Chermoshentsev, A. Feschenko, S.A. Gavrilov RAS/INR, Moscow, Russia D.A. Chermoshentsev MIPT, Dolgoprudniy, Moscow Region, Russia D.A. Chermoshentsev Skoltech, Moscow, Russia
	Bunch shape monitors, based on a transverse RF-scanning of secondary electrons, are used for measurements of particles longitudinal distribution in bunches at different linear ion accelerators. The phase resolution of such monitors depends crucially on accuracy of fabrication and tuning of RF-deflector, thus preliminary simulations of its electrodynamic characteristics are of importance for subsequent commissioning of the monitor. Simulations of some basic operational electrodynamic parameters and results of experimental measurements are presented.
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THPSC057	Application of Model Independent Techniques at VEPP-2000 and SIS100	damping, betatron, collider, experiment	664
	D.V. Rabusov, Yu. A. Rogovsky BINP SB RAS, Novosibirsk, Russia
	In order to exploit an accelerator successfully all parameters should be set correctly. To check and fix errors in the accelerator lattice measurements of parameters of the betatron motion and measurements of optical functions of the accelerator lattice are used. Due to Model Independent Analysis it is possible to carry out measurements of the beta-function and the phase advance fast. Using NAFF technique lets us compute betatron tune with good precision. Limiting capabilities of the MIA at SIS100 project are discussed, the first results of the application of MIA and NAFF techniques at booster VEPP-5 and at collider VEPP-2000 are shown.
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THPSC059	Thermal Loads of Wire-Based Beam Instrumentation at Ion Linacs	ion, proton, instrumentation, niobium	670
	M.M. Churaev, S.A. Gavrilov RAS/INR, Moscow, Russia M.M. Churaev Skoltech, Moscow, Russia M.M. Churaev MIPT, Dolgoprudniy, Moscow Region, Russia
	Wire-based beam instrumentation remains a reference for calibration of many other instruments, providing direct and accurate measurements with high resolution. However beam power increasing of existing and forthcoming ion linacs results in strict constraints on operation modes acceptable for control and diagnostics. Relevant simulations of wire thermal loads are necessary not only for a mode choice, but also for a preliminary design of such instrumentation. Simulations for different wire materials and various beam parameters are made. Features of the model are discussed. Numerical estimations and conclusions are presented in comparison with some experimental results.
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THPSC060	The Longitudinal Distribution and Bunch Length Measurements at VEPP-2000 Collider	collider, cavity, impedance, detector	673
	Yu. A. Rogovsky, E. Perevedentsev, V. Volkov, Yu.M. Zharinov BINP SB RAS, Novosibirsk, Russia
	The paper describes the bunch length measurement system for VEPP-2000 collider, equiped with optical analysers based on LI-602 dissector, which provides permanent measurements of the longitudinal beam profile. Potential well distorsion lengthening was measured at different bunch currents for the energies below 500 MeV. First measurements reveals the presence of microwave instabilty with turbulent emittance growth. The thresholds of these processes was used to estimate the values of reactive part of the longitudinal impedance. Measured energy loss factors was compared with computer simulations for the RF cavity. All results will be discussed and further estimations will be given.
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THPSC063	System of Thermomonitoring and Thermostabilizing of Kurchatov Synchrotron Radiation Source	controls, radiation, synchrotron, synchrotron-radiation	680
	N.I. Moseiko, E.V. Kaportsev, K. Moseev, A.G. Valentinov NRC, Moscow, Russia Y.V. Krylov RRC, Moscow, Russia
	The modern system of thermomonitoring and thermostabilizing (TERMOCS) of KSRS - Kurchatov synchrotron radiation source is described. The TERMOCS system provides: a monitoring of temperatures of the magnets and RF-resonators of KSRS; informing operator on violations of the course of technological process; data protection from illegal access; an archiving and displaying of archive data in a trend type. The system includes 480 temperature sensors of the AD592 type, providing the accuracy of measurements 0,2 C. System of thermo stabilizing of the linear accelerator - the proportional integral differentiating regulator for support of stability of temperatures at the level of 0,05 C. During creation of the system the modern decisions on the basis of the modular complexes of NI, the modern servers and the Citect SCADA software system were used.
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THPSC065	Diagnostics of Accelerator Beams by the Dependence of the Vavilov-Cherenkov Radiation Intensity on the Refractive Index of the Radiator "n"	photon, detector, radiation, microtron	686
	K.A. Trukhanov SSC RF- IBMP RAS, Moscow, Russia A.I. Larkin NRNU, Moscow, Russia V.I. Shvedunov MSU, Moscow, Russia
	The report presents the results of development the method TLSH* for finding of the particle speed distribution (PSD) in beams of accelerators. PSD is deduced from the Volterra integral equation of the first kind with the right part, which is by the dependence of Cherenkov radiation intensity (ChRI) from n, experimentally obtained for the given beam. PSD is the second derivative of ChRI. The problem of stability of the second derivative is solved by attracting the priori information (for example, nonnegative of the solution). Using optical dispersion of radiator is discussed. It enables to find PSD even in the single cluster of particles. The possibility of determining the PSD in the cross section beam is discussed too. The method also enables to find PSD upon a noticeable transverse speed of the particles in the beam. The method is virtually non-destructive in many cases. *Measurement of the distributions of particle velocity in the accelerator beam on the basis of the Vavilov-Cherenkov radiation at optical and microwave ranges. Trukhanov K. A., Larkin A. I., Shvedunov V. I. Izv. RAS. Ser. Phys. 2010. V. 74, No. 11, Pp. 1665-1668.
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THPSC067	Coaxial Quarter Wavelength Impedance Converter for Coupling Control of Triode Cavity	impedance, cavity, coupling, gun	689
	K. Torgasin, T. Kii, K. Masuda, K. Morita, K. Nagasaki, H. Ohgaki, S. Suphakul, H. Zen Kyoto University, Kyoto, Japan
	A quarter wavelength coaxial cavity has been developed for triode-type thermionic RF gun. The triode-type RF gun is a modification of present 4.5 cell thermionic RF gun of KU-FEL (Kyoto University Free Electron Laser) facility with aim to mitigate the back'bombardment effect. Thereby a coaxial quarter wavelength cavity with cathode material shall be added to the main 4.5 cell accelerating body. The coaxial cavity has the function of pre-buncher to control the injection phase and power of electron bunches into the main accelerating body. Transient tests have demonstrated the quarter wavelength cavity to be undercoupled. However, for operation at high beam loading conditions overcoupled conditions are required. In order to control the coupling we have developed an external air side coaxial quarter wavelength impedance converter. The design of the impedance converter enables operation at high RF power (<20 kV) without changing the cavity geometry. In this work we present our design and performance of quarter wavelength impedance converter as applied to quarter wavelength triode cavity. K. Torgasin et al., Cold Test of the Coaxial Cavity for Thermionic Triode Type RF Gun, in Proc. IPAC, 2013, pp.324-326.
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THPSC068	Integrated Inspection Method of Motor Transports Based on Acceleration Technology	neutron, controls, radiation, detector	692
	A.M. Fialkovsky, P.O. Klinovsky, K.V. Kotenko, V.P. Malyshev, T.R. Virkunen NIIEFA, St. Petersburg, Russia
	Integrated inspection method of motor transports was suggested based on linear electron accelerator and neutron generator, which helps to detect substances forbidden for carrying, including explosives, narcotic drugs and fissionable materials. The linear high-frequency electron accelerator is a source of X-ray bremsstrahlung. The result of scanning is an introscopical image of a motor transport with color-selected suspicious substances. The neutron activation analysis of these substances with neutron generator as a neutron source lets detect elemental substance composition as well as identify explosives or narcotic drugs. This article contains accelerator specifications, which lets implement suggested method.
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THPSC072	Digital-to-Analog Beam Energy and Current Stabilization of ELV Accelerators	controls, cathode, feedback, software	700
	D.S. Vorobev, E.V. Domarov, S. Fadeev, N.K. Kuksanov, A. Lavrukhin, P.I. Nemytov BINP SB RAS, Novosibirsk, Russia
	Funding: Budker Institute of Nuclear Physics, Novosibirsk, Russia. 1.Previous systems of energy and current stabilization are based on analog PID-controllers. They provide good stability at sufficient speed-work. 2.Increased requirements of technological lines to the speed of the accelerator injection to set-up parameters and introduction of technological lines, in which the accelerator is a slave device and should within the shortest possible time to respond onto the changes of operation input parameters, forced us to find the way of stabilization systems improvement. 3.New stabilization system is able to provide current output speed up to 5mA/sec, at required energy stability. 4.Digital-to-analog stabilization is produced as a superstructure on the existing system and is made as a source code added into the basic accelerator control program. This approach enables to modernize simply the existing accelerators. The code itself is two independent parts. The first part is the current beam corrector, which calculate the derivate (current speed) at a time and aims to hold it in set-up range, taking into account the difference of the tasks and the necessity of cathode warm up. The second part is a energy compensator. It adds the current derivate into accelerator energy channel, reducing the energy settlements at once. 5.Present system passed through the testing and it is already installed onto ELV-0.5(0.5MeV, 100mA) accelerator in Qingzhou (a/m tyre production) and onto ELV-8(2.5MeV, 40mA) accelerators in China for cable insulation treatment.
	Poster THPSC072 [3.958 MB]
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THPSC074	Longitudinal Beam Distribution Measurements in Damping Ring of VEPP-5 Injection Complex	damping, injection, impedance, operation	705
	V.V. Balakin, O. Anchugov, D.E. Berkaev, F.A. Emanov, G.Y. Kurkin, O.I. Meshkov BINP SB RAS, Novosibirsk, Russia V.L. Dorokhov BINP, Novosibirsk, Russia
	Injection Complex VEPP-5 was turned into operation in the end of 2015 in the Budker Institute of Nuclear Physics (Novosibirsk, Russia). The main task of the facility is production, acceleration and transportation of high intensity electron and positron beams for two BINP's colliders. Now, VEPP-5 successfully delivers electron and positron beams to the collider VEPP-2000 and ready to start operation with the acceleration complex VEPP-4M. Beam diagnostics issues are very important for VEPP-5 facility tuning during the operation. Longitudinal beam diagnostic based on synchrotron radiation in the VEPP-5 Damping Ring is presented in the article. Equipment operation principle, main measurement results and future prospects are presented in this paper.
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THPSC084	The New Control for Magnet System of KSRS	controls, software, radiation, synchrotron	727
	E.V. Kaportsev, Y.V. Krylov RRC, Moscow, Russia K. Moseev, N.I. Moseiko, A.G. Valentinov NRC, Moscow, Russia
	The running cycle of Kurchatov Synchrotron Radiation Source (KSRS) includes the injection of electrons with energy 80 MeV from the linear accelerator in the booster storage ring Siberia-1, the accumulation of a electron current up to 400 mA and, then, electron energy ramping up to 450 MeV with the subsequent extraction of electrons in the main ring, storage ring Siberia-2, and accumulation there up to 300 mA, and at last the energy ramping up to 2.5 GeV. Several years ago, a modernization of the current system of automated control systems (ACS) has started. This article presents one of the most important parts - the new control subsystem of the magnet system
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THPSC087	Stabilization of the Equilibrium Position of a Magnetic Control System with Delay	controls, feedback, simulation, permanent-magnet	736
	A.Yu. Aleksandrov, A.P. Zhabko, I.A. Zhabko Saint Petersburg State University, Saint Petersburg, Russia A.A. Kosov ISDCT SB RAS, Irkutsk, Russia
	Funding: The research was partially supported by the Saint Petersburg State University (project No. 9.37.157.2014), and by the Russian Foundation for Basic Research (grant Nos. 15-08-06680 and 16-01-00587-a). Nonlinear oscillatory systems are widely applied for the modeling of charge particles motions in cyclotrons in neighborhoods of equilibrium orbits. They are also used for the analysis and synthesis of magnetic control devices. An actual problem for such systems is stabilization of their operating modes. In this report, analytical and numerical investigations of stability of the equilibrium position for a nonlinear oscillatory system are presented. The system can be treated as a mathematical model of magnetic suspension control system of a gyro rotor. A delay in the feedback control scheme and dissipative forces occurring due to energy losses at the interaction of the magnetic field with currents in the control loops are taken into account. Two approaches to the synthesis of stabilizing controls are proposed. The first one is based on the using of gyroscopic control forces. It is applicable in the case of essentially nonlinear homogeneous dissipative forces. The second approach is efficient for systems with linear dissipative forces. For this case, potential control forces are constructed. With the aid of a computer simulation of dynamics of closed-loop systems, a comparison of these approaches is fulfilled, and their features and conditions of applicability are determined.
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TUXMH01

The European XFEL - Status and Commissioning

linac, undulator, klystron, operation

11

H. Weise
DESY, Hamburg, Germany

Funding: The European XFEL is funded by the respective funding agencies of the contributing countries.
The European X-ray Free Electron Laser* in Hamburg, Germany, is being constructed by an international consortium. The facility is being built to offer photon beam of highest brilliance at wavelengths down to below 1 Angstrom. The accelerator complex with all its sections, the injector, the 17.5 GeV superconducting linac, bunch compressors, beam distribution systems etc. was built under the leadership of DESY. Seventeen European research institutes contributed to the accelerator complex and to the comprehensive infrastructure. DESY coordinates the European XFEL Accelerator Consortium but also contributes with many accelerator components, and the technical equipment of buildings, with its associated general infrastructure. With the finishing of the accelerator installation in autumn 2016, the first cool-down of the superconducting linac was started. Commissioning is next with the goal to demonstrate first lasing in spring 2017. Users are expected to use the first photon beams in 2017. A project overview and the status will be given illustrating the success of the collaborative work.
* http://xfel.eu

Slides TUXMH01 [48.625 MB]

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TUXMH02

Novosibirsk Free Electron Laser: Terahertz and Infrared Coherent Radiation Source

FEL, radiation, undulator, laser

16

N.A. Vinokurov, V.S. Arbuzov, K.N. Chernov, I.V. Davidyuk, O.I. Deichuli, E.N. Dementyev, B.A. Dovzhenko, Ya.V. Getmanov, Ya.I. Gorbachev, B.A. Knyazev, E.I. Kolobanov, A.A. Kondakov, V.R. Kozak, E.V. Kozyrev, S.A. Krutikhin, V.V. Kubarev, G.N. Kulipanov, E.A. Kuper, I.V. Kuptsov, G.Y. Kurkin, L.E. Medvedev, S.V. Motygin, V.N. Osipov, V.K. Ovchar, V.M. Petrov, A.M. Pilan, V.M. Popik, V.V. Repkov, T.V. Salikova, M.A. Scheglov, I.K. Sedlyarov, S.S. Serednyakov, O.A. Shevchenko, A.N. Skrinsky, S.V. Tararyshkin, V.G. Tcheskidov, A.G. Tribendis, P. Vobly, V. Volkov
BINP SB RAS, Novosibirsk, Russia
I.V. Davidyuk, Ya.V. Getmanov, B.A. Knyazev, E.V. Kozyrev, S.S. Serednyakov, N.A. Vinokurov
NSU, Novosibirsk, Russia
A.G. Tribendis
NSTU, Novosibirsk, Russia

Funding: This work was supported by Russian Science Foundation (project N 14-50-00080).
High-power free electron laser (FEL) facility NovoFEL has been created at Budker INP. Its wavelength can be tuned over a wide range in terahertz and infrared spectrum regions. As a source of electron bunches this FEL uses multi-turn energy recovery linac which has five straight sections. Three sections are used for three FELs which operate in different wavelength ranges (the first one - 90-240 microns, the second - 37-80 microns and the third - 5-20 microns). The first and the second FELs were commissioned in 2003 and 2009 respectively. They operate for users now. The third FEL is installed on forth accelerator track which is the last one and electron energy is maximal here. It comprises three undulator sections and 40 m optical cavity. The first lasing of this FEL was obtained in summer, 2015. The radiation wavelength was 9 microns and average power was about 100 watts. The designed power is 1 kilowatt at repetition rate 3.75 MHz. Radiation of third FEL has been delivered to user stations recently. The third FEL commissioning results as well as current status of the first and second FELs and future development prospects are presented.

Slides TUXMH02 [26.379 MB]

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TUCAMH02

CW 100 mA Electron RF Gun for Novosibirsk ERL FEL

gun, cathode, cavity, radiation

24

V. Volkov, V.S. Arbuzov, E. Kenzhebulatov, E.I. Kolobanov, A.A. Kondakov, E.V. Kozyrev, S.A. Krutikhin, I.V. Kuptsov, G.Y. Kurkin, S.V. Motygin, A.A. Murasev, V.K. Ovchar, V.M. Petrov, A.M. Pilan, A.V. Repkov, M.A. Scheglov, I.K. Sedlyarov, S.S. Serednyakov, O.A. Shevchenko, S.V. Tararyshkin, A.G. Tribendis, N.A. Vinokurov
BINP SB RAS, Novosibirsk, Russia
N.A. Vinokurov
NSU, Novosibirsk, Russia

Funding: Grant 14-50-00080 of the Russian Science Foundation
Continuous wave (CW) 100 mA electron RF gun for injecting the high-quality 300-400 keV electron beam in Novosibirsk microtron recuperator (ERL) and driving Free Electron Laser (FEL) was developed, built, and commissioned at BINP SB RAS. The RF gun consists of normal conducting 90 MHz RF cavity with a gridded thermionic cathode unit. Bench tests of rf gun is confirmed good results in strict accordance with the calculations. The gun was tested up to the design specifications at a test bench that includes a diagnostics beam line. The rf gun stand testing showed reliable work, unpretentious for vacuum conditions and stable in long-term operation. The design features of different components of the gun are presented. Preparation and commissioning experience is discussed. The beam test results are summarized.

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TUCBMH01

Status of the Kurchatov Synchrotron Light Source

controls, wiggler, synchrotron, vacuum

27

A.G. Valentinov, A. Belkov, Y.A. Fomin, E.V. Kaportsev, V. Korchuganov, Y.V. Krylov, V.I. Moiseev, K. Moseev, N.I. Moseiko, D.G. Odintsov, S.G. Pesterev, A.S. Smygacheva, A.I. Stirin, V. Ushakov, V.L. Ushkov, A. Vernov
NRC, Moscow, Russia

The Kurchatov synchrotron light source operates in the range of synchrotron radiation from VUV up to hard X-ray. To improve facility capabilities in the last few years technical modernization of all facility systems is underway and new beam lines are constructed. In this report the present status and future plans of the Kurchatov synchrotron light source is presented.

Slides TUCBMH01 [10.384 MB]

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TUCBMH02

Numerical Analysis of the Effective Width of the Spectrum of Synchrotron Radiation

radiation, polarization, synchrotron, synchrotron-radiation

30

V.G. Bagrov, A.S. Loginov, A.D. Saprykin
Tomsk State University, Tomsk, Russia
D.M. Gitman, A.D. Levin
IFUSP, Sao Paulo, Brazil

A notation of an effective spectral width is introduced in the theory of synchrotron radiation, as an exact quantitative characteristic of the spectral properties. Within a classical theory, numerical calculations of the effective spectral width for polarization components of the synchrotron radiation have been carried out (for an effective width exceeding 100 harmonics). It is found how the effective spectral width and the initial harmonic change depending on the energy of the radiating particle.

Slides TUCBMH02 [0.265 MB]

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WEXMH01

Feeding BINP Colliders with the New VEPP-5 Injection Complex

injection, positron, linac, damping

56

F.A. Emanov, A.V. Andrianov, K.V. Astrelina, V.V. Balakin, A.M. Barnyakov, O.V. Belikov, D.E. Berkaev, M.F. Blinov, Y.M. Boimelshtain, D. Bolkhovityanov, A.G. Chupyra, N.S. Dikansky, A.R. Frolov, Ye.A. Gusev, G.V. Karpov, A.S. Kasaev, V.I. Kokoulin, A.A. Kondakov, I. Koop, I.V. Kuptsov, G.Y. Kurkin, R.M. Lapik, N.N. Lebedev, A.E. Levichev, P.V. Logatchov, Yu. Maltseva, P.V. Martyshkin, A.A. Murasev, D.A. Nikiforov, A.V. Pavlenko, V.M. Pavlov, A.V. Petrenko, V. Podlevskih, V.V. Rashchenko, S.L. Samoylov, S.V. Shiyankov, A.N. Skrinsky, A.A. Starostenko, D.P. Sukhanov, A.G. Tribendis, A.S. Tsyganov, S.V. Vasiliev, V.D. Yudin, I.M. Zemlyansky
BINP SB RAS, Novosibirsk, Russia
Yu. A. Rogovsky
Budker INP & NSU, Novosibirsk, Russia
A.L. Romanov
Fermilab, Batavia, Illinois, USA

VEPP-4 and VEPP-2000 e⁺e⁻ colliders are switching to feed from VEPP-5 Injection Complex via newly constructed K-500 beam transfer line. Since first operation of K-500 at the end of 2015 injection complex delivered e⁺ and e^- beams to VEPP-2000 facility and is getting ready to work with VEPP-4. Upgraded injection chain demonstrated ability to provide design luminosity toVEPP-2000 and techniques of reliable operation are now under development. The designand operation experience of Injection Complex and transfer lines will be presented.

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WECAMH04

Recent Experiments With High Energy Electron Cooler in COSY

proton, target, experiment, storage-ring

67

V.B. Reva, M.I. Bryzgunov, V.V. Parkhomchuk, D.N. Skorobogatov
BINP SB RAS, Novosibirsk, Russia
V. Kamerdzhiev
FZJ, Jülich, Germany
I.N. Meshkov
JINR, Dubna, Moscow Region, Russia

The 2 MeV electron cooling system at COSY-Jülich started operation in 2013. The cooling process was observed in the wide energy range of the electron beam from 100 keV to 1.26 MeV. Vertical, horizontal and longitudinal cooling was obtained with bunched and coasting proton beam. This report deals with electron cooling experiments at COSY with proton beam at energy 1.66 and 2.3 GeV. The proton beam was cooled at different regimes: RF on and off, barrier bucket RF, and cluster target on and off.

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WECBMH01

First Cold Tests of the Superconducting cw Demonstrator at GSI

cavity, linac, ion, cryomodule

83

F.D. Dziuba, M. Amberg, K. Aulenbacher, W.A. Barth, V. Gettmann, M. Miski-Oglu
HIM, Mainz, Germany
M. Amberg, M. Basten, M. Busch, H. Podlech, M. Schwarz
IAP, Frankfurt am Main, Germany
K. Aulenbacher
IKP, Mainz, Germany
W.A. Barth, M. Heilmann, S. Mickat, S. Yaramyshev
GSI, Darmstadt, Germany
W.A. Barth, S. Yaramyshev
MEPhI, Moscow, Russia

The future experimental program of super heavy element synthesis at GSI desires high intense heavy ion beams at or above the coulomb barrier, exceeding the capabilities of the GSI-UNILAC (Universal Linear Accelerator). Additionally, the existing GSI accelerator chain will be used as an injector for FAIR (Facility for Antiproton and Ion Research) primarily providing high power heavy ion beams at a low repetition rate. Due to this limitations a new dedicated superconducting (sc) continuous wave (cw) linac is proposed to keep the Super Heavy Element (SHE) research program at GSI competitive. The construction of the first linac section has been finished in the 3rd quarter of 2016. It serves as a prototype to demonstrate its reliable operability in a realistic accelerator environment. This demonstrator cryomodule comprises the sc 217 MHz crossbar-H-mode (CH) multigap cavity as the key component of the whole project and two sc 9.3 T solenoids. The performance of the cavity has been extensively tested at cryogenic temperatures. In this contribution the measurement results of initial cold tests will be presented.

Slides WECBMH01 [4.677 MB]

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WECDMH01

Commissioning of High Efficiency Standing Wave Linac for Industrial Applications

klystron, gun, high-voltage, power-supply

99

A.N. Ermakov, A.S. Alimov, V.V. Khankin, L. Ovchinnikova, N.I. Pakhomov, N.V. Shvedunov, V.I. Shvedunov
SINP MSU, Moscow, Russia
A.S. Alimov, A.N. Ermakov, V.V. Khankin, V.V. Klementiev, L. Ovchinnikova, N.I. Pakhomov, Yu.N. Pavshenko, N.V. Shvedunov, V.I. Shvedunov, A.S. Simonov
LEA MSU, Moscow, Russia

We present the results of the commissioning of the pulsed linear electron accelerator with beam energy of 10 MeV, developed with the participation of scientists and engineers of the SINP MSU, LEA MSU Ltd. and JSC "RPE "Toriy". The source of RF power for accelerator is a multibeam klystron KIU-147A operating at 2856 MHz with pulse output power 6 MW and an average power of 25 kW. As a result of commissioning we received at the output of accelerator scanning system an electron beam with an energy of 10 MeV and an average power of more than 15 kW. Capture ratio and electronic efficiency of 1.24 m long accelerating structure are greater than 65%.

Slides WECDMH01 [7.123 MB]

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WECDMH03

A 5 to 20 MeV Electron Linear Accelerator for Metrology

radiation, vacuum, shielding, target

102

Yu. Zuev, Z. Andreeva, M.A. Kalinichenko, A.P. Klinov, A.S. Krestianinov, O.L. Maslennikov, A.V. Tanchuk, V.V. Terentyev
NIIEFA, St. Petersburg, Russia
S.G. Trofimchuk, I.I. Tsvetkov
VNIIM, St.Petersburg, Russia

The paper outlines design parameters and construction features of an electron linear accelerator to be operated in the D.I.Mendeleyev Institute for Metrology (VNIIM). The accelerator system is intended to form electron and bremsstrahlung radiation fields of variable intensity. This shall extend characteristics of the National measurement standard to be used for calibration of a space monitoring equipment, embedded measuring means for industrial accelerator facilities and others. The accelerator system consists of an electron source, resonance accelerating structure, beam-bending magnet'separator and radiation head with a block of bremsstrahlung targets, foils and collimators. An important feature of the system is spatial steadiness of radiation field at energies varied from 5 to 20 MeV and more than tenfold variation of the accelerated particle current. The status of the project will be presented as well.

Slides WECDMH03 [9.654 MB]

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THCAMH02

Electron Accelerators Series ILU and Prospects of Their Application in the Food Industry

radiation, acceleration, operation, high-voltage

108

V.O. Tkachenko, V.V. Bezuglov, A.A. Bryazgin, B.L. Faktorovich, V.A. Gorbunov, M.V. Korobeynikov, V.E. Nekhaev, A.D. Panfilov, V.M. Radchenko, E.A. Shtarklev, A.V. Sidorov, A. YU. Vlasov, L.A. Voronin
BINP SB RAS, Novosibirsk, Russia

The report describes a series of industrial accelerators type ILU. Lists their basic parameters and characteristics. Presents data on their application in the cable industry, medicine and other fields. Reports on experiments with food products. Discusses the new features and technologes of the application of accelerators ILU in the food industry. Discusses problems in the Russian legislation related to the treatment of foodstuffs by ionizing radiation.

Slides THCAMH02 [37.047 MB]

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THZMH01

SC and HTS-related Activity at IHEP

dipole, quadrupole, solenoid, superconductivity

128

S. Kozub, A.I. Ageev, I. Bogdanov, E. Kashtanov, V.A. Pokrovsky, P.A. Shcherbakov, L.S. Shirshov, V.I. Shuvalov, I. Slabodchikov, V. Sytnik, L. Tkachenko, O.V. Trusov, S. Zinchenko
IHEP, Moscow Region, Russia

The SC program at IHEP of NRC Â“Kurchatov InstituteÂ” has been developed intensively in the 1980ies in the framework of the UNK project. More than a hundred of models of the SC magnets of various designs, and then the pilot batch consisting of 25 full-scale dipoles and 4 quadrupoles have been designed, manufactured and tested at IHEP. Two SC magnetic systems of Electron Lens for the Tevatron collider were developed, manufactured, shipped and successfully brought into operation. Development of fast-cycling SC magnets for the FAIR project is discussed. Racetrack coils from HTS-2G tape for electrical machines that were developed, manufactured and tested are reported. Test and trial results with HTS dipole magnets employing Bi2223 as well as second-generation HTS are also reviewed.

Slides THZMH01 [6.546 MB]

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THCDMH02

Recent Optimized Design of ILC Cryomodule With Explosion Welding Technology

niobium, cryomodule, linear-collider, collider

141

B.M. Sabirov
JINR, Dubna, Moscow Region, Russia

Primary purpose of this experiment is the development of techniques to simplify and make cheaper the construction of the cryomodules. In the current ILC TDR design the helium vessel and the connected pipes are made of expensive titanium. JINR in association with INFN several designs for these transitions have been produced and studied during the last years. The results of measuring microhardness by Vickers microindentation are issued of ~3.8 GPa and the breaking strength was 375 MPa. Helium leak measurements revealed no leaks at a background leak rate of 0.4*10^-10 atm*cc/s. For imitation of use transition sample in real working position, connected with Nb cavity, Nb rings were joint with Nb pipe of samples by EBW. Superposition of all residual stresses may result plastic deformation, failure of welds, and consequently occurrence of a leak. Test result of thermocycles in LHe and in the LN ussued absence of leak at background leak rate ~0.5*10^-10 atm*cc/sec. The results showed the full eligibility of suggested design Nb+Ti+SS transition sample not for only Linear Collider, but for any cryogenic systems.

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TUCASH02

Commissioning and First Tests of the New Standing Wave 10 Mev Electron Accelerator

linac, simulation, coupling, site

173

S.M. Polozov, D.B. Bazyl, T.V. Bondarenko, M. Gusarova, Yu.D. Kliuchevskaia, M.V. Lalayan, V.I. Rashchikov, E.A. Savin
MEPhI, Moscow, Russia
M.I. Demsky, A.A. Eliseev, V.V. Krotov, D.E. Trifonov
CORAD Ltd., St. Petersburg, Russia

A new linear electron accelerator for industrial applications was developed by the joint team of CORAD and MEPhI. It is based on conventional biperiodical accelerating structure for energy range from 7.5 to 10 MeV and beam power up to 20 kW. The use of modern methods and codes for beam dynamics simulation, raised coupling coefficient and group velocity of SW biperiodic accelerating structure allowed to reach high pulse power utilization and obtain high efficiency. The first two accelerators with the new structure have been installed and tested.

Slides TUCASH02 [4.924 MB]

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TUCASH06

Progress in CW Mode Electron Resonance Accelerator BETA-8 Development

cavity, resonance, operation, power-supply

185

A.V. Telnov
VNIIEF, Sarov, Russia

This paper presents the status of powerful linear electron accelerator BETA-8 development. The accelerator is operating in CW mode and used for ionizing radiation research. The basic constituent of accelerator is coaxial half-wave resonator excited on T1 wave. Required electron beam energy is attained by multiple passing through central transversal plane of resonator. Electron beam iterative passing is realized by turning magnets located on resonator outwalls. The main parameters of the accelerator are: beam output energy 1.5 - 7.5 MeV, average power up to 300 kW, operating frequency 100 MHz. By now the main components of facility, namely, coaxial resonator, three HF generator units each with output power 180 kW, HF power summation device, the unit of power input (UPI) designed to transfer HF signal of 600 kW have been designed and manufactured. Electron beam transport system project consisting of up to five full sequential passes through accelerating resonator has been developed. Turning electromagnets have been designed and manufactured. HF parameters measurements for coaxial resonator assembled with UPI have been realized at low HF power level. All HF generator units and HF power summation devices have been tested. HF electron injector has been designed, manufactured and tested. The accelerator testing is supposed to be carried out in one HF generator unit supply mode.

Slides TUCASH06 [2.798 MB]

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TUCASH07

HF Structure of BETA-8 Electron Resonance Accelerator

cavity, resonance, feedback, coupling

188

M.L. Smetanin
VNIIEF, Sarov, Russia

BETA-8 is new powerful resonance electron accelerator designed in RFNC-VNIIEF to operate in continuous wave generating regime. The basic constituent of accelerator is half-wave coaxial resonator excited at T1 wave. The work presents the main approaches to numerical modeling of accelerator HF power system components. The results of computation of accelerating resonator with operating frequency of 100 MHz and inductive unit of HF power input (UPI) designed to transmit continuous HF signal at operating frequency with mean power level of 600 kW are reported. The transmitting coaxial waveguide connecting UPI with feeding HF generator has been computed, designed and manufactured. The calculated results have been tested by measurements of HF parameters of the resonator assembled with UPI and connecting waveguide. The possibility to locate indicating loop (a detector working in frequency feedback circuit of feeding HF generator) in transmitting feeder has been demonstrated. The method of calibration computation of measuring inductive loop that is an element of amplitude feedback circuit of HF generator is presented. The dual matched load necessary for preliminary adjustment of operating modes of feeding HF generator unit (with mean power up to 180 kW) and technological systems of accelerating complex has been computed, designed and put into operation.

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THXSH02

Three Transverse Deflecting Systems for Electron Beam Diagnostics in the European Free-Electron Laser XFEL

klystron, controls, diagnostics, high-voltage

196

A.A. Zavadtsev
RAS/INR, Moscow, Russia

Funding: European XFEL GmbH, Ministry of Education and Science of Russia
In frames of Russian in-kind contribution to Europe-an XFEL, INR in cooperation with DESY is responsible for Transverse Deflecting Systems (TDS) for special beam diagnostic in the XFEL linac. Three TDS have been developed: TDS INJ in the Injector, TDS BC1 in the Accelerator tunnel after Bunch Compressor 1 and TDS BC1 after Bunch Compressor 2. Each system in-cludes S-band disk-loaded deflecting structure (DLS), waveguide system, klystron, pulse transformer, modu-lator and control system. TDS INJ has been built, as-sembled in the Injector building and tested. It is used to monitor the bunch length, longitudinal phase space and slice emittance now. Exceptionally small, exceed-ing expectations, slice emittance of electron bunch was measured using TDS INJ during the XFEL Injector commissioning. Three structures for TDS BC1 and TDS BC2 as well as the waveguide systems have been built, tested and TDS BC2 part installed in the XFEL tunnel.
On behalf of the joint XFEL TDS team

Slides THXSH02 [16.400 MB]

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THCBSH01

INR RAS Instrumentation for Bunch Shape and Beam Cross-Section Monitoring

linac, diagnostics, ion, operation

204

S.A. Gavrilov, A. Feschenko, P.I. Reinhardt-Nickoulin
RAS/INR, Moscow, Russia

Instruments for bunch shape and beam cross-section diagnostics at ion linacs are as important as complicated devices. Widespread Bunch Shape Monitors developed in INR RAS are used during a linac commissioning and optimization of beam dynamics. Beam Cross-Section Monitors implemented at INR RAS linac provide efficient non-destructive beam tuning and control. Features of both monitors investigated in simulations and beam tests are described. A variety of experimental results are presented.

Slides THCBSH01 [12.054 MB]

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TUPSA006

Development of RF Accelerator on Parallel-Coupled Structure - Trend in Accelerator Technique

cavity, focusing, coupling, acceleration

219

Y.D. Chernousov
ICKC, Novosibirsk, Russia

Development of parallel-coupled accelerating structure (PCS), creation of RF linier accelerator based on PCS is new and rapidly developing field of accelerator technology. Compared with conventional accelerating structures with serial communication - the standard traveling and standing waves structures, the PCS has a lot of features and advantages. There are many problems in the development of RF linear accelerators: breakdowns at high power levels, the destruction of the structure due to overheating, the excitation of higher-order mode, the decline of field strength along the structure, transients, beam loading, beam focusing, multipactor, radiation accelerator cleanliness, etc. PCS - the best accelerating structure for solving these problems.

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TUPSA007

New Experimental Results on RF Accelerator with Parallel-Coupled Structure and RF Controlled Gun

injection, gun, focusing, cavity

222

Y.D. Chernousov
ICKC, Novosibirsk, Russia
I.M. Ikryanov, I.V. Shebolaev
ICKC SB RAS, Novosibirsk, Russia

New data on the development and experimental investigation of the RF accelerator based on the 9-cavities parallel-coupled accelerating structure that is equipped with a high-frequency grid-controlled electron gun are presented. Accelerating structure, injection system and focusing system are improved. Previously observed second emission resonant discharge - multipactor is suppressed by increasing the field amplitude in the structure first cavity and using the protector. The parameters of the accelerated beam close to the design ones, i.e. electron energy up to 8 MeV, capture to the acceleration mode up to 100%, were received. Capture is provided by the RF electron focusing of the microwave field structure with usage of the magnetic focusing system based on permanent magnets and RF grid control in the electron gun.

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TUPSA009

Electron Beam Dynamics Calculation and Accelerating Structure Geometry Design in 10 MeV Hybrid Electron Linac

linac, focusing, coupling, beam-loading

228

A.V. Bulanov, S.V. Matsievskiy, E.A. Savin, N.P. Sobenin
MEPhI, Moscow, Russia

Electron linear accelerators with an energy of 10 MeV are widely used for industrial purposes. This article presents the electron dynamic calculations and the design of linac with a standing wave (SW) buncher based on the biperiodic accelerating structure and a constant impedance backward traveling wave (BTW) accelerating section after it. In such accelerator, all unused RF power coming out from BTW section is used in SW section to improve the linac efficiency. Thus no RF load is needed. Also, a beam is experiencing an RF focusing in the SW buncher. Solenoid focusing field influence on the beam dynamics in the TW section was studied.

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TUPSA010

Electron Linear Accelerator with the Variable Energy from 6 to 11 MeV

linac, gun, klystron, focusing

231

A.V. Bulanov, E.A. Savin, N.P. Sobenin
MEPhI, Moscow, Russia
A.V. Gryzlov
TORIY, Moscow, Russia

The standing wave accelerator with the variable energy from 6 to 11 MeV has been designed. Electron energy is controlled by the injected current. The buncher has been designed to provide capture above 70% for the all injected currents range. The possibility of using a permanent radially magnetized toroidal magnet for the beam focusing was studied.

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TUPSA012

Superconducting Stored Energy RF Linac as Free Electron Laser Driver

cavity, FEL, linac, laser

237

V.G. Kurakin, P.V. Kurakin
LPI, Moscow, Russia

Due to cavity losses in multi pass free electron laser (FEL), generation starts in it from definite threshold of driving electron beam current. Depending on generation wave range the threshold current strikes from fraction of ampere to dozens of amperes. In order to rich laser saturation, from hundreds to thousands electron bunches are required. Simple estimations give the value from units up to tens joules of bunches train energy in order to rich FEL saturation for infrared wave range (approximately 20 - 25 MeV of bunches energy and 3 A of pick current, bunch length being 1 cm). A beam with parameters mentioned might be obtained in rf superconducting linac operating in stored energy mode. The advantage of such approach is simplified linac power supply since dozens watts cw rf generator is required only to rich necessary accelerating voltage. At the same time the energy spread arising from beam loading may be compensated by additional cavities exited at shifted frequencies. In this paper Maxwell equations are used for beam-cavity interaction analysis. The bunch energy loss or the same the voltage induced by radiating bunch is expressed in terms of cavity external parameters. The detailed analysis of beam energy spread compensation is carried out followed by an example showing the reality of FEL schema suggested.

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TUPSA018

Experimental Facility for E-Beam Irradiation Test of Prototype IF Target in RISP

target, controls, vacuum, radiation

253

V. Gubin
Institute of Laser Physics, SB RAS, Novosibirsk, Russia
I. Chakin, S. Fadeev, M. Golkovsky, Yu. Maltseva, P.V. Martyshkin
BINP SB RAS, Novosibirsk, Russia
J.Y. Kim, J.-W. Kim, Y.H. Park
IBS, Daejeon, Republic of Korea

Nowadays project RISP is developed in IBS, Daejeon. One of the main project devices is graphite targets system meant for production of rare isotopes by means of the in-flight fragmentation (IF) technique. The power inside the target system deposited by the primary beam with energy of 200 MeV/u is estimated to be around 100 kW. The target represents rotating multi-slice graphite disc cooled by thermal radiation. Necessary step of the target development is integrated test of target prototype under high power electron beam modelling real energy deposit into target. This test is planned to be held in BINP, Novosibirsk, with the use of ELV-6 accelerator. This paper presents the design of experimental facility as well as experimental program of test. Specifications of electron beam (energy close to 800 keV, size ~ 1mm, total power 30-40 kW) are discussed. Parameters and design of basic devices and systems of facility are described.

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TUPSA019

Upgrade of the RF System on the LUE-200

klystron, linac, rf-amplifier, neutron

256

K.I. Mihailov
JINR/FLNP, Moscow Region, Russia
E.A. Golubkov, V. Kobets, A.N. Repkin, A.P. Sumbaev
JINR, Dubna, Moscow Region, Russia
V.M. Pavlov
BINP SB RAS, Novosibirsk, Russia

In the report works on upgrade of RF system of the LUE-200 (IREN) electron linac are provided. The main attention is paid to system of preliminary excitement of klystrons. After work on installation of the second accelerating section RF system of Installation it was considerably remade that allowed to carry out start-up of the second stage of the IREN installation successfully. Methods, features and problems in case of a training of two accelerating sections are discussed. Influence of the temperature and frequency modes on joint operation of accelerating sections. Results of setup of the RF system and a training of sections, and also results of posting of a bunch are given.

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TUPSA020

Installation for the Research of Z-Pinch Plasma Initiated by the Electron Beam

plasma, focusing, gun, luminosity

258

A.A. Drozdovsky, A.V. Bogdanov, S.A. Drozdovsky, R. Gavrilin, A.V. Kantsyrev, V.A. Panyushkin, I. Roudskoy, S.M. Savin, V.V. Yanenko
ITEP, Moscow, Russia
P.V. Sasorov
Keldysh Institute of Applied Mathematics, Moscow, Russia
V.V. Yanenko
MEPhI, Moscow, Russia

For researches on plasma physics has been designed and constructed the electronic gun with the cold cathode on energy to 300 keV. The gun have the parameters: time width of pulses -100 ns, current amplitude - 100 A. The adiabatic plasma lens is developed for transportation and compression of the received electron beam. Results of researches are presented.

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TUPSA030

Regulation of the Waveguide Coupling Factor of Standing Wave Linear Accelerator

coupling, resonance, insertion, cavity

279

D.S. Yurov
MSU, Moscow, Russia
V.I. Shvedunov
LEA MSU, Moscow, Russia
V.I. Shvedunov
SINP MSU, Moscow, Russia

Regulation of the waveguide coupling factor of standing wave linear accelerator allows to adjust the value of accelerated current, keeping the reflected RF power close to zero. This ensures the most efficient use of RF energy and absence of overvoltage in the waveguide elements. The paper presents studies results for various methods of coupling factors regulation with continuous wave (CW) normal conducting linear accelerator used as an example. The results of calculations and measurements on the mock-up of the accelerating structure are presented.

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TUPSA035

Estimation of Multipacting in CDS Structure

multipactoring, simulation, cavity, coupling

288

I.V. Rybakov
RAS/INR, Moscow, Russia
I.I. Isaev
DESY Zeuthen, Zeuthen, Germany

The Cut Disk Structure (CDS) is recommended for replacement of the first cavity of the main part of INR linac. For the cavity work stability there should be no multipactor at operating regime. CDS structure was first set on exploitation at DESY PITZ electron linac. For this cavity according to the analytical estimation multipaction should appear at the operating power level in coupling cells, but it was not approved by the numerical simulation with both accelerating and coupling modes excitation for RF energy transfer along the cavity. The multipactor appears only with the secondaty emission yield (SEY) growth which could happen if the inner surface of the cavity is polluted. The results of multipactor investigation in CDS PITZ were used as reference for the CDS structure for the first cavity of the main part of INR linac. The analytical estimation and numerical simulation of multipactor in CDS INR structure shows the appearance of the discharge in coupling cells with the OFC copper SEY for the operating regime of the cavity. An option for the multipactor damping with the forced excitation of oscillations in coupling cell with voltage higher than upper multipactor limit was considered.

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TUPSA040

S-Band Choke Mode Cavity for Low Energy Storage Ring

cavity, HOM, storage-ring, scattering

300

L. Ovchinnikova, V.I. Shvedunov
SINP MSU, Moscow, Russia
A. Ryabov
IHEP, Moscow Region, Russia
V.I. Shvedunov
LEA MSU, Moscow, Russia

Several variants of a low-energy storage ring for Thomson scattering X-ray source were considered in *. The most promising variant "C" of the ring with small dimensions and large dynamic aperture has also large momentum compaction factor, which would lead to too long bunches with RF cavity operating at 714 MHz, so shorter wavelength must be used. In this paper we present results of optimization of S-band double-cells cavity with parasitic mode damping by chokes similar to **. Interaction of the bunch circulating in the ring with cavity parasitic modes is simulated.
* L. Ovchinnikova, V. Shvedunov, A. Mikhailichenko et al.. A comparative study of low energy compact storage rings for a thomson scattering x-ray source. Proc. of IPAC-16, 2016, pp. 3308-3310.
** T. Shintake, The Choke Mode Cavity, Jpn. J. Appl. Phys, Vol. 31,1992, pp. L1567-L1570, No. 1lA

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TUPSA041

High-Energy Micro-Buncher Based on the mm-Wavelength Dielectric Structure

proton, wakefield, plasma, quadrupole

303

A.V. Petrenko
CERN, Geneva, Switzerland
I.L. Sheinman
LETI, Saint-Petersburg, Russia

The proton-driven plasma wakefield acceleration is a recently proposed technique promising a GeV/m rate of acceleration to a TeV-scale energy in a single plasma stage. In order to excite high-amplitude plasma wakefields a long proton bunch from a synchrotron should be broken into a sequence of sub-mm long micro-bunches which can drive the plasma oscillations resonantly. We suggest a novel approach to produce the required train of micro-bunches using collinear wakefield acceleration in a dielectric-loaded structures. First the energy modulation is introduced into the proton beam with the help of the mm-wavelength dielectric accelerating structure. Then the energy modulation is transformed into the longitudinal micro-bunching using proton beamline with magnetic dipoles. Beam dynamics simulations were used to find the appropriate parameters of the dielectric accelerating structure, driving electron bunch and the beam focusing system.

Poster TUPSA041 [0.792 MB]

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TUPSA042

Software Complex "Dynpart" for the Calculation of Self-Consistent Beam Dynamics in Dielectric Wakefield Accelerating Structures

wakefield, acceleration, focusing, software

307

I.L. Sheinman, A.E. Yakushkin
LETI, Saint-Petersburg, Russia

Dielectric waveguide structures are a basis for development of new generation of accelerators on the basis of a wakefield method of the charged particle acceleration, beam manipulation, and also free electron lasers. A self-coordinated dynamics of relativistic particle beams in a single layer cylindrical waveguide with dielectric filling is investigated. The computer code is developed based on mathematical expressions for the analysis of the radial dynamics. The possibility of modeling interaction of different types of particles in a bunch is realized. Influence of both own wake fields and external fields of focusing and deflection systems on bunch dynamics are analyzed.

Poster TUPSA042 [0.860 MB]

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TUPSA043

Wake Field Components in a Rectangular Accelerating Structure With Dielectric Anisotropic Loading

wakefield, acceleration, radiation, accelerating-gradient

310

I.L. Sheinman, Yu.S. Sheinman
LETI, Saint-Petersburg, Russia

Dielectric lined waveguides are under extensive study as accelerating structures that can be excited by electron beams. Rectangular dielectric structures are used both in proof of principle experiments for new accelerating schemes and for studying the electronic properties of the structure loading material. Some of the materials used for the waveguide loading of accelerating structures possess significant anisotropic properties. General solutions for the fields generated by a relativistic electron beam propagating in a rectangular dielectric waveguide have been derived using the mode expansion method for the transverse operators of the Helmholtz equation. An expression for the combined Cherenkov and Coulomb fields obtained in terms of a superposition of LSM and LSE-modes of rectangular waveguide with anisotropic dielectric loading has been obtained. Numerical modeling of the longitudinal and transverse (deflecting) wakefields has been carried out. It is shown that the dielectric anisotropy influences to excitation parameters of the dielectric-lined waveguide with the anisotropic loading.

Poster TUPSA043 [1.334 MB]

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TUPSA050

Electron Beam Stability in the Energy Recovery Linac for the Lithographic Free Electron Laser

linac, cavity, undulator, radiation

319

Ya.V. Getmanov, O.A. Shevchenko, N.A. Vinokurov
BINP SB RAS, Novosibirsk, Russia
N.A. Vinokurov
NSU, Novosibirsk, Russia

According to microelectronic production leaders the lithography based on the free electron laser (FEL) could become the main technology for the elements mass production with scale to 5 nm in the nearest future. One of the main problem is the absence of the working FEL with required parameters. The feasibility study of those FEL based on superconducting energy-recovery linac (ERL) was made in Budker INP. The ERL average current is limited by longitudinal and transverse instabilities, caused by interaction between electron beam and its induced fields in the superconducting cavities. The estimations of the threshold currents and ERL parameters were made.

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TUPSA051

Form-factor Determination of an Arbitrary Bunch Sequence for the Coherent Radiation Calculation

radiation, factory, target, diagnostics

322

D.A. Shkitov, A.E. Harisova
TPU, Tomsk, Russia

It is well known that the coherent effect occur when charged particles in a bunch radiate in phase. This is accompanied by a quadratic increase in the radiation intensity and significantly influences the radiation spectrum. The coherent radiation is characterized by a form factor, which is the coefficient mainly depending on the ratio of bunch dimensions to the observed radiation wave length. The form factors will be different for the synchrotron and transition radiation because of their different nature of radiation. Now electron accelerators that produced beams with a sub-picosecond bunch length and a picosecond distance between them already exist. Through the appearance of interference between radiation from such a sequence of bunches, the total intensity is no longer equal to the sum of radiation from each bunches. For this reason, it is essential to determine the form factor of an arbitrary electron bunch sequence. Herein the uniform bunch distribution will be the special case. In this report we describe an approach to obtaining the form factor of the arbitrary bunch sequence.

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TUPSA052

First Order Perturbation Theory Evaluation of Initial Stage of Self Amplified Crystal-Based X-Ray Emission

radiation, electromagnetic-fields, resonance, undulator

325

A.I. Benediktovitch
BSU, Minsk, Belarus, Belarus

X-ray Free Electron Lasers open new revolutionary opportunities for investigations in materials science, chemistry, biology and other areas. However, due to high cost of construction and maintain, the access to these facilities for wide scientific community is quite limited. This motivates search for schemes of compact bright x-ray sources. The size of X-ray Free Electron Lasers is dictated by basic properties of undulator radiation: to produce x-rays with Angstrom wavelength from cm period undulator one needs electrons with energy in GeV range. If one considers the radiation mechanisms accompanying the propagation of electron beam through a crystal structure (channeling radiation, parametric x-ray radiation, Cherenkov radiation near K-edge), one can see that to get photons in x-ray range one needs electrons with energy of tens to hundreds MeV. One of the ways to get bright x-ray source based on crystal-assisted radiation mechanisms is to run the electrons in coherent radiation regime based on self amplified spontaneous emission (SASE). In the present contribution we will discuss under which conditions the SASE can start in the case of crystal-assisted radiation mechanisms. To investigate the initial stage of SASE process we use the first-order perturbation theory that enables to describe the collective beam response as effective susceptibility. Based on this approach we will analyze which experimental geometry would promising for the SASE process onset.

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TUPSA062

Modeling of Triode Source of Intense Radial Converging Electron Beam

cathode, target, plasma, simulation

336

V.V. Altsybeyev, V.I. Engelko, A.D. Ovsyannikov, D.A. Ovsyannikov, V.A. Ponomarev
Saint Petersburg State University, Saint Petersburg, Russia
R. Fetzer, G. Müller
KIT, Karlsruhe, Germany

The considered source of triode type produces intense radial converging electron beam for irradiation of cylindrical targets. As an electron emitter an explosive plasma cathode is used. The role of initial transverse velocities of electrons, defocusing effect of the controlling grid, the beam self-magnetic field, electron and ion emission from the controlling grid, backscattering of electrons and ion flow from the target is analyzed. Conditions for achieving required electron beam parameters (the electron kinetic energy - 120 keV, the beam energy density on the target 40 J/cm² on a maximum possible length of the target surface) were determined.

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TUPSA063

The Electron Trajectories Construction in the System With a "Real" Geometry of the Field Cathode

cathode, controls, synchrotron, neutron

339

A.Yu. Antonov
St. Petersburg State University, St. Petersburg, Russia
M.I. Varajun
LETI, Saint-Petersburg, Russia

The problems of the trajectories constructing for field electrons and emission images simulation are considered. As an approximation of the emitter shape an explicitly and implicitly defined surfaces are selected. Hyperboloidal, ellipsoidal and paraboloidal models are studied. Also an equipotential surface of the charged sphere-on-orthogonal-cone system is used. A simple solution of the field distribution problem is allowed to formulate the Cauchy problem for the motion equations. The shape of the anode (the projector microscope screen) can be selected in any desired form. Achieving a screen by electrons is performed with dense output technique in numerical approach to the solution. The distribution of the work function on the cathode surface is obtained. The trajectories for the projection of the field emission activity as the image are used.

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TUPSA064

The Infinitely Thin Field Emitter Mathematical Modeling

cathode, vacuum, electronics

342

E.M. Vinogradova
Saint-Petersburg State University, Saint-Petersburg, Russia
N.V. Egorov
St. Petersburg State University, St. Petersburg, Russia
E.V. Kalaturskaja
Saint Petersburg State University, Saint Petersburg, Russia

In this work an axisymmetric diode electron-optical system based on a field emitter is simulated. The field emitter in the form of a thin filament of finite length is located on the flat substrate with the dielectric layer. The anode is a plane. The electrostatic potential distribution was found in an analytical form - in the form of Fourier-Bessel series in the whole area of the system under investigation. The coefficients of Fourier-Bessel series are the solution of the system of linear equations with constant coefficients.

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TUPSA068

Simulation of S-Band RF Gun with RF Beam Control

cavity, cathode, gun, controls

345

A.M. Barnyakov, A.E. Levichev, D.A. Nikiforov
BINP SB RAS, Novosibirsk, Russia
M.V. Maltseva
NSU, Novosibirsk, Russia

The design and operation of electron RF gun with RF beam control are described. Results of numerical simulation of electromagnetic fields and beam dynamics are presented. RF gun consists of two resonators operating at E010 mode with 180 degrees phase shift at frequency of 2856 MHz. RF control is carried out via coaxial resonator with grid-cathode capacity. Accordint to result of the simulation, RF gun with RF control allows producing electron bunches with duration of 50 ps, energy of about 3 MeV and the energy spread of about 5%.

Poster TUPSA068 [0.996 MB]

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WEPSB004

The Intelligent Object-oriented Interface in the Design Environment of The Charged Particles Relativistic Beams Transport Channels

focusing, quadrupole, interface, software

357

G.P. Averyanov, V.A. Budkin, A.V. Kobylyatskiy, I.O. Osadchuk
MEPhI, Moscow, Russia

The effectiveness of the design during the computer modeling is significantly determined by the user interface convenience of the application package and the time adaptation of the user to that application. This paper presents a new approach in the implementation of KATRAN software interface for the transport channels design of the charged particles relativistic beams. The interface is a sequence of operations for the designer during the virtual channel creation ' setting beam parameters at the channel input, the choice of the displayed elements of the channel, the channel assembly, setting the calculation algorithm with the parameters optimization. Thus the immersion of the designer into the details of the computing environment, the features of the software and channel modeling mathematical methods is not needed. The data objects are the typical elements of the transport channels (quadrupole lenses, magnets, open intervals, etc.). The work is carried out in interactive mode. After the "build and run" of the channel is finished, the full-screen multi-factor analysis of all major parameters of the beam and channel transparency is provided.

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WEPSB006

On Modeling and Optimization of Intense Quasiperiodic Beam Dynamics

controls, klystron, bunching, simulation

363

I.D. Rubtsova
St. Petersburg State University, St. Petersburg, Russia

The paper is devoted to quasiperiodic beam dynamics investigation. Particle density is modeled by trigonometric polynomial. Space charge field is represented in the similar form. This approach is applied to beam dynamics investigation in klystron-type buncher. Numerical algorithm of polynomial coefficients calculation from the positions and impulses of model particles is formalized. As a result Coulomb field intensity is expressed in the form of integral over the set of particle phase states. Integro-differential beam evolution model is presented. Analytical expression of the variation of beam dynamics quality criterion is obtained. It makes possible directed methods using for beam dynamics optimization.

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WEPSB007

On Application of Monte Carlo Method for Poisson Problem Solving

controls, lattice, simulation, plasma

367

L.V. Vladimirova, I.D. Rubtsova
St. Petersburg State University, St. Petersburg, Russia

The paper presents the application of random grid walk for Dirichlet problem solving for Poisson equation. Boundary value problem is discretized and reduced to the system of linear algebraic equations. The matrix of this system is used for stochastic matrix constructing. Thus, there is a possibility of Markov chains obtaining. The special random value is defined on Markov chain trajectories; this value is used for approximation of the desired solution. The advantages of this method are discussed in the paper. The algorithm is applied for electric potential calculation in the cell of support lattice of exit window in large-aperture electron accelerator.

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WEPSB008

About Behavior of Electrons and Ions in the Accelerating Interval

ion, plasma, acceleration, vacuum

371

A.S. Chikhachev
Allrussian Electrotechnical Institute, Moskow, Russia
H.Y. Barminova
MEPhI, Moscow, Russia

The behavior of electron-ion ensemble accelerated in the diode is studied. Hot electrons are described by means of the distribution function which is a solution of the collisionless kinetic function depending not only from integrals of motion. To describe the cold ions the hydrodynamics equations are used. The possibility of the ion-sound velocity excess of the ions is shown. The expression for the electron gas pressure is received. The dependence of relative density of the ions on the coordinate is discussed in the case of closed phase trajectories.

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WEPSB009

The Behavior of Powerful Relativistic Electron Beam With Elliptical Cross-Section in Longitudinal Magnetic Field

emittance, quadrupole, cathode

373

A.S. Chikhachev
Allrussian Electrotechnical Institute, Moskow, Russia
H.Y. Barminova
MEPhI, Moscow, Russia

The behavior of relativistic intense electron beam with elliptical cross-section moving in a longitudinal magnetic field is investigated with the help of self-consistent model. The solutions for the beam envelopes are obtained in the case of the beam current differed from Alfven limit and the beam charge neutralized. The conditions of stationary beam propagation are determined, however it is discovered that for the case of non-zero self-consistent magnetic field the stationary beam propagation is violated, the partial emittance oscillations being observed. The found time- dependence of the partial emittances and the beam envelopes illustrates the effect of emittance transfer caused by the coupled particle motion in magnetic field.

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WEPSB013

On Approach for Resonant Frequency Tuning in Drift Tube Structures on the Designing Stage

cavity, simulation, controls, target

386

I. Skudnova, V.V. Altsybeyev
Saint Petersburg State University, Saint Petersburg, Russia

Current research considers the interdigital H-mode linear resonant accelerator with drift tubes mounted inside the cavity. The focus of the study has been on the dependence of resonant frequency on the parameters of the geometry. Since Alternating-Phase-Focusing (APF) type of accelerator is investigated, the efficiency of the operation depends on the synchronization of the charged particle velocity and accelerating field oscillations. Researchers can control it by the variation of longitudinal size of the cells of the structure (periods). On the other hand, the effective performance of the resonant system requires the equality of resonant frequencies of its cells, because it affects the uniformity of accelerating field distribution along the axis. The diversity of cells longitudinal sizes causes the deviation from the particular value of the resonant frequency. This aberration can be eliminated by the adjustment of other geometry parameters: period's length, gap ratio and drift tube diameter. We have conducted the study to analyze the relation between resonant frequency and these values. Using the this dependency we can tune the geometry parameters of each period in the structure. We first create the computer-aided design (CAD) geometry model of the accelerator cavity. Then, using Comsol Multiphysics, the platform for physics-based modeling and simulation, we conduct the calculation of resonant frequencies.

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WEPSB016

Coupled Bunch Instabilities in the Storage Rings

impedance, wakefield, storage-ring, synchrotron

395

A.S. Smygacheva, Y.A. Fomin, V. Korchuganov
NRC, Moscow, Russia

Funding: The reported study was funded by RFBR according to the research project No. 16-32-00335 mol_a.
Coherent instabilities of the bunched beam are one of the reasons that limit a total beam current in the storage rings. Although there are solutions of this problem, the estimation and reduction of wake-fields influence on the longitudinal beam dynamics remain important things. In the article we return to the subject of coherent instabilities of the unevenly-filled bunches in the storage rings.

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WEPSB018

Beam Dynamics Calculation of Electron Bunch Sequence Passing Through Dielectric

radiation, focusing, wakefield, quadrupole

401

A. Altmark
LETI, Saint-Petersburg, Russia
A. Kanareykin
Euclid TechLabs, LLC, Solon, Ohio, USA

Funding: Grant 15-02-08745 from the Russian Foundation for Basic Research.
The present work involves modeling the electron beams dynamics for development of new THz source based on cylindrical dielectric waveguide. The sequence of relativistic electron bunch generates Cherenkov radiation, which is a superposition of the TM and HEM-modes. The distances between bunches is selected for creating of monochromatic THz radiation*. We made calculation of beam dynamics taking into account the Space Charge and focusing field with help of original BBU 3000 code. We present result for different parameters of waveguide and different offsets of bunches. The main parameter of radiation was investigated: length of wave pocket, monochromaticity and frequency.
* Altmark A, Kanareykin A. The source of THz radiation based on dielectric waveguide excited by sequence of electron bunches// 2016 J. Phys.: Conf. Ser. 732 012037

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WEPSB020

On a New Approach for Description of Self-Consistent Distributions for a Charged Particle Beam

distributed, operation, linac, synchrotron

407

O.I. Drivotin, D.A. Ovsyannikov
St. Petersburg State University, St. Petersburg, Russia

The present report is concerned with the problem of particle phase space distributions for a charged particle beam. A new approach is presented. It provides the possibility to specify various coordinates in the phase space. The main attention has been focused on the case where motion integrals are taken as phase coordinates. Using such coordinates, one can obtain a lot of self-consistent distributions. Some distributions for a breathing beam are considered as examples: generalized Brillouin flow, generalized KV distribution, and others. Besides, this approach allows simple graphical representation of various self-consistent distributions.

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WEPSB032

Numerical Analysis of Cavity Mode Operation and Electron Beam Dynamics in Lebedev Institute Microtron

microtron, cavity, operation, simulation

428

V.S. Dyubkov, Y.A. Bashmakov, Y. Lozeev
MEPhI, Moscow, Russia
Y.A. Bashmakov
LPI, Moscow, Russia

Dynamics of electrons in classic microtron is studied. 3D cavity model is developed and electromagnetic field distribution is simulated. Dependence of output beam parameters on microtron operation mode is investigated and discussed.

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WEPSB035

Model of the Optimal Parameters Choice for the Charged Particles Beam

controls, focusing, hadron, hadrontherapy

437

S.A. Nemnyugin, O.A. Malafeyev
Saint Petersburg State University, Saint Petersburg, Russia

Problem of the optimal parameters choice for the charged particles beam is considered. The beam is characterized by the set of control parameters and multiple parameters which characterize its quality. So multiple criteria of optimization should be taken into account. Among possible criteria of optimization following ones should be mentioned: energy, intensity, biological efficiency and so on. It is assumed that in general case choice of the control parameters which is optimal for all criteria is not possible. The problem is formulated as the conflict control problem. The case is considered when parameters which should be optimized forms the vector. Finding of the compromise solution is considered. The method and computing algorithms are proposed. Present work is further extension of *.
* G. V. Alferov, O. A. Malafeyev, S. A. Nemnyugin. Charged Particles Beam Focusing with Uncontrollable Changing Parameters // 2014 2nd International Conference on Emission Electronics, Proceedings, 2014. P. 25-27.

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WEPSB036

Gold Ions Beam Losses at the Nuclotron Booster

booster, ion, vacuum, beam-losses

440

A.V. Philippov, A. Tuzikov
JINR/VBLHEP, Dubna, Moscow region, Russia

The calculation results of the gold ions beam losses along the Nuclotron Booster perimeter are given. The presented results take the ion stimulated desorption from the cold surface of the vacuum chamber and collimation of charge-exchanged gold ions into account.

Poster WEPSB036 [1.919 MB]

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WEPSB039

New Techniques for Operation and Diagnostics of Relativistic Electron Coolers

photon, laser, solenoid, scattering

449

J. Dietrich, M.W. Bruker, A. Hofmann, E. Riehn, T. Weilbach
HIM, Mainz, Germany
K. Aulenbacher, W. Klag
IKP, Mainz, Germany
M.I. Bryzgunov, V.V. Parkhomchuk, V.B. Reva
BINP SB RAS, Novosibirsk, Russia

The Helmholtz Institut Mainz (HIM) performs experiments related to possible improvements of high-energy d.c.-electron coolers. Results and activities concerning non-invasive beam diagnostics and beam control at large operating currents will be shown. Furthermore, progress of our project to use turbo generators as a means for potential-free power generation in high-energy electron coolers is presented.

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WEPSB040

Commissioning of the 60 keV Electron Cooler for the NICA Booster

vacuum, cathode, ion, booster

452

A.V. Bubley, M.I. Bryzgunov, A.P. Denisov, A.D. Goncharov, V.M. Panasyuk, V.V. Parkhomchuk, V.B. Reva
BINP SB RAS, Novosibirsk, Russia

The 60 keV electron cooler for the NICA booster was designed and constructed at BINP SB RAS. The article describes results of various measurements obtained during its commissioning. Also some details of design and construction of the cooler are discussed.

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WEPSB042

Commissioning of Electron Cooling Devices at HIRFL-CSR

ion, experiment, operation, high-voltage

458

X.D. Yang, G.H. Li, J. Li, X.M. Ma, L.J. Mao, M.T. Tang, T.L. Yan
IMP/CAS, Lanzhou, People's Republic of China

Funding: National Natural Science Foundation of China, NSFC Grant No. 11375245
Electron cooling plays an important role in the Heavy Ion Research Facility of Lanzhou cooler storage ring(HIRFL-CSR). Two electron coolers were equipped in main ring(CSRm) and experimental ring(CSRe) in HIRFL-CSR respectively. Two electron cooling devices have commissioned for twelve years since they were installed and completed in 2004. The function and operation procedure of electron cooler were presented in this report. Their performance and the highlights of experiments results were described. Their commission and optimization were summarized here. The issues and troubles during the commission were enumerated and collected in this presentation. The future upgrade and improvement were suggested, and the new operation scenario and requirement were proposed.

Poster WEPSB042 [0.902 MB]

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WEPSB057

Beam Dynamics in New 10 Mev High-Power Electron Linac for Industrial Application

simulation, gun, linac, bunching

493

S.M. Polozov, V.I. Rashchikov
MEPhI, Moscow, Russia
M.I. Demsky
CORAD Ltd., St. Petersburg, Russia

Beam dynamics simulation in electron gun, bunching and accelerating cells of new 10 Mev high-power electron linac was fulfieled with the help of developed at MEPhI SUMA * and BEAMDULAC-BL ** codes. Three-electrode electron gun was used to obtain up to 400-450 mA of pulse beam current which is necessary to produce 300 mA of the accelerated beam. Precise gun simulation was conducted to satisfy all necessary output beams characteristics, such as profile, energy spectrum, phase space size etc. Some additional calculation was conducted to provide wide range of gun output beam parameters which will be used for subsequent accelerator modification. The conventional biperiodical accelerating structure based on disk loaded waveguide was used in linac. Beam dynamics optimization was pointed to obtain effective beam bunching for all energy range and to achieve narrow energy spectrum. Simulation results shows that linac provides effective beam bunching and acceleration for wide bands of beam currents and energies.
* V.I. Rashchikov, PAST, Series: Nuclear Physics Investigations, 10 (18), p.50, 1990
** T.V. Bondarenko et al. PAST, Series: Nuclear Physics Investigations, 6 (88), p. 114, 2013

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WEPSB059

Realization of Positron Annihilation Spectroscopy at LEPTA Facility

positron, detector, ion, radiation

496

K. Siemek, V.I. Hilinov, P. Horodek
JINR/DLNP, Dubna, Moscow region, Russia
E.V. Ahmanova, M.K. Eseev, A.G. Kobets, I.N. Meshkov, O. Orlov, A.A. Sidorin
JINR, Dubna, Moscow Region, Russia
M.K. Eseev
NAFU, Arkhangelsk, Russia
A.G. Kobets
IERT, Kharkov, Ukraine

Positrons are used in materials science to study open volume defects. Several positron annihilation spectroscopy (PAS) techniques exist. These methods are based on detection of the 511 keV gamma quantum. The first method is the analysis of the Doppler broadening of annihilation line and provide information about defect concentration. Both annihilation quanta can be observed. Coincidence observation of two quanta gives additional information about the environment around defect. The second method is based on lifetime concept, which allows to distinguish type of defects. Nowadays, positron beams are of great interest for materials science. Using a low energy, monoenergetic beam it is possible to control the positron penetration depth from the sample surface to a depth of several microns. Thus, the beam can be used to characterize thin films, analysis of surface modification, studying influence of ions on matter etc. This report aims to present a current status of realization and progress in PAS methods at LEPTA facility at JINR.

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WEPSB060

Development of Positron Annihilation Spectroscopy at the LEPTA Facility

positron, target, acceleration, cryogenics

499

A.A. Sidorin, E.V. Ahmanova, M.K. Eseev, A.G. Kobets, I.N. Meshkov, O. Orlov
JINR, Dubna, Moscow Region, Russia
M.K. Eseev
NAFU, Arkhangelsk, Russia
V.I. Hilinov, P. Horodek, I.N. Meshkov, K. Siemek
JINR/DLNP, Dubna, Moscow region, Russia
P. Horodek, K. Siemek
IFJ-PAN, Kraków, Poland
A.G. Kobets
IERT, Kharkov, Ukraine

The report aims to present the status of the development of the LEPTA facility for further enhancement of the positron annihilation spectroscopy (PAS) method application at the LEPTA facility. The research in solid state physics performed currently is based on slow monochromatic positron flux from the injector and Doppler PAS. The new positron transfer channel being under construction at the LEPTA allows us to develop more advanced PAS method - so called 'Positron Annihilation life-time spectroscopy' (PALS). It will enrich significantly the research program at the LEPTA. PAS method is sensitive to microdefects in solids. A pair of gamma quanta, born as a result of positron-electron annihilation carries information about the density of the defects that have the size less than 10 nm and are located at the depth from the surface of the material depending on the positron energy. New monochromatic positron source construction supplied with the autonomous cooling system with emitter-source of the activity of 30 mCi (iThemba LABS production) and new positron transfer channel are presented in report.

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WEPSB064

Modifications of Electron Linear Accelerators Produced in NIIEFA for Sterilization

gun, klystron, focusing, vacuum

505

Yu. Zuev, A.P. Klinov, A.S. Krestianinov, O.L. Maslennikov, V.V. Terentyev
NIIEFA, St. Petersburg, Russia

The paper analyses a series of electron linear accelerators equipped with one and the same accelerating structure. The structure operates in the standing-wave mode at a frequency of 2856 MHz. The accelerators differ in type and duty cycle of RF generators, electron sources, beam extraction and scanning devices and in configuration and layout of their auxiliary equipment. These modifications can provide the beam energy of 8-10 MeV and beam power up to 10^-12 kW. Facilities with the accelerating structure have been used for electron beam sterilization of medical disposables and food processing over ten years.

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WEPSB068

Radiation From Open-Ended Flanged Waveguide With Dielectric Loading

simulation, vacuum, radiation, extraction

515

V.V. Vorobev, S.N. Galyamin, A.A. Grigoreva, A.V. Tyukhtin
Saint Petersburg State University, Saint Petersburg, Russia

Funding: The work is supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grants from Russian Foundation for Basic Research (No. 15-32-20985, 15-02-03913).
Terahertz radiation is considered as a promising tool for a number of applications. One possible way to emit THz waves is to pass short electron bunch through a waveguide structure loaded with dielectric. Previously we considered the extraction of radiation from the open end of the waveguide with dielectric loading in both approximate and rigorous formulation. We also developed a rigorous approach based on mode-matching technique and modified residue-calculus technique for the case when the waveguide with dielectric is co-axial with infinite waveguide with greater radius. The study presented is devoted to the case when the dielectric loaded waveguide has a flange and enclosed into another waveguide with a greater radius. The case of the flanged waveguide in the unbounded vacuum space can be described as the limiting case of the problem under consideration. We perform analytical calculation (based on mode-matching technique and modified residue-calculus technique) and direct numerical simulation.

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WEPSB069

Radiation of a Bunch Flying from the Open End of a Waveguide with a Dielectric Loading

radiation, simulation, vacuum, electromagnetic-fields

518

S.N. Galyamin, A.V. Tyukhtin, V.V. Vorobev
Saint Petersburg State University, Saint Petersburg, Russia
A. Altmark, S. Baturin
LETI, Saint-Petersburg, Russia

Funding: Work is supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grant from Russian Foundation for Basic Research (No. 15-32-20985).
In this paper we proceed with our investigation of Terahertz emission from beam moving in waveguide structures with dielectric layer*. Recently we have considered an open-ended waveguide (with uniform dielectric filling) placed inside regular vacuum waveguide of a larger radius and excited by a single incident waveguide mode**. Here we present analytical results for the case where the structure is excited by a moving charge. We also perform simulations using CST® PS code and compare results.
* S.N. Galyamin, A.V. Tyukhtin, S.S. Baturin, S. Antipov, Opt. Express 22(8) 8902 (2014).
** S.N. Galyamin, A.V. Tyukhtin, S.S. Baturin, V.V. Vorobev, A.A. Grigoreva, in Proc. IPAC'16, pp. 1617-1619.

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THPSC001

The Multipole Lens Mathematical Modeling

multipole, vacuum, cathode, controls

535

E.M. Vinogradova
Saint-Petersburg State University, Saint-Petersburg, Russia
A.V. Starikova
Saint Petersburg State University, Saint Petersburg, Russia

In the present work the mathematical model of the multipole system is presented. The multipole system is composed of arbitrary even number of the uniform electrodes. Each of the electrodes is a part of the plane. The potentials of the electrodes are the same modulus and opposite sign for neighboring electrodes. The variable separation method is used to solve the electrostatic problem. The potential distribution is represented as the eigen functions expansions. The boundary conditions and the normal derivative continuity conditions lead to the linear algebraic equations system relative to the series coefficients.

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THPSC003

The Design of Permenant Magnet Spread System for 0.5 MeV Irradiation Accelerator

permanent-magnet, high-voltage, dipole, radiation

541

J. Huang, Q.S. Chen, K. Fan, M. Fan, W. Qi, Y.Q. Xiong, J. Yang, L.G. Zhang
HUST, Wuhan, People's Republic of China
T. Yu, C. Zuo
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China

Funding: Supported by Natural Science Foundation (11505068)
The traditional electron beam scanning magnet has many disadvantages, for example, the regulatory of excitation current is very complex and the irradiation uniformity as well as the irradiation area is very difficult to improve and expand. Thus the author of the paper proposes an innovative technology of a permanent magnet spread system for 10 MeV irradiation accelerator which uses a special configuration of the magnetic field to spread electron beam bunch directly and would remarkably improve the spread uniformity, simplify the accelerator and would be helpful to protect the titanium window and expand the irradiation area. Also, the technology could as well be used on the electron beam irradiation of those irregular structured objects of large size.

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THPSC008

Magnetic Systems for Beam Transport at Extraction Channels of ILU Accelerators

extraction, focusing, radiation, dipole

556

V.V. Bezuglov, A.A. Bryazgin, B.L. Faktorovich, E.N. Kokin, V.E. Nekhaev, A.D. Panfilov, V.M. Radchenko, E.A. Shtarklev, V.O. Tkachenko, A. YU. Vlasov, L.A. Voronin
BINP SB RAS, Novosibirsk, Russia

This paper is devoted to magnetic systems for beam transport at extraction channels of electron industrial accelerators of the ILU type. The extraction systems meant for energy of the accelerated electrons up to 10 MeV and beam power up to 100 kW are described. The analysis of their work subject to the processes connected with the induced eddy currents in metal walls of beam scanning chambers is made; special attention is paid to forming of the dose field in a radiation zone. In paper the magnetic system for bending of the nonmonochromatic beams is offered to application. The essence of the described device consists in application of two identical magnetic mirrors in which distribution of magnetic field on depth is formed so that natural rise of magnetic field intensity on an entrance to a mirror is followed by decrease of this field under a certain law. In the issue of impact on charged particles of forces arising in cylindrical lenses of each mirror is possible to compensate angular divergence of strongly nonmonochromatic beams in gaps of magnetic mirrors and to receive after bending a beam with parameters close to phase characteristics of an input beam. The design procedure of such bending device and a general view of installation for experimental check of the offered bending system on electron beam are given in this paper.

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THPSC017

A Synchrotron Radiation Beamline Installed at BINP to Study the High Luminosity LHC Vacuum System

photon, vacuum, radiation, synchrotron

572

A.A. Krasnov, V.V. Anashin, A.M. Semenov, D.B. Shwartz
BINP SB RAS, Novosibirsk, Russia
V. Baglin, P. Chiggiato, B. Henrist
CERN, Geneva, Switzerland
D.B. Shwartz
NSU, Novosibirsk, Russia

In the framework of the HL-LHC project, the vacuum performance of new surface material needs to be studied. In particular, a-C coating is proposed as an anti-multipactor surface in the HL-LHC Inner Triplets. Since the protons in the HL-LHC Inner Triplets will generate synchrotron radiation (SR) with ~ 10 eV critical energy and ~ 10¹⁶ ph/m/s flux, it is therefore of great importance to study the impact of such photons on a-C coating held at room and cryogenic temperature and compare the results against present LHC material. This paper describes construction and parameters of experimental set-up based on new Synchrotron Radiation beamline from booster synchrotron BEP at BINP. The experimental program releasing in collaboration between CERN and BINP for performing measurements of photon stimulated gas desorption, photon distribution and photo-electron emission provoked by synchrotron radiation are presented

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THPSC019

Hardware for Increasing Reliability of the Power Supply System for Corrector Magnets of the European XFEL

power-supply, operation, controls, monitoring

578

O.V. Belikov, V.R. Kozak, E.A. Kuper, A.S. Medvedko
BINP SB RAS, Novosibirsk, Russia
H.-J. Eckoldt, N. Heidbrook
DESY, Hamburg, Germany

The total length of European X-ray Free-Electron Laser (XFEL) tunnels is 5,77 km. There are used about 300 corrector magnets for tuning electron beam. Every corrector magnet is fed by separate power supply. Power supplies for corrector magnets are distributed in 6 halls. So, replacing of one failed power supply produced too long pause in facility operations. The paper discussed different solutions which allow increasing reliability of corrector magnet power supply system for European XFEL.

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THPSC021

Corrector magnet power supplies of the European XFEL

power-supply, feedback, experiment, hardware

584

O.V. Belikov, V.R. Kozak, A.S. Medvedko, D.N. Skorobogatov, R. Vahrushev
BINP SB RAS, Novosibirsk, Russia
H.-J. Eckoldt, N. Heidbrook
DESY, Hamburg, Germany

In 2016 the testing of the first section of the particle accelerator for the European X-ray Free-Electron Laser (XFEL) was completed and the results were excellent. BINP take anticipation in many works of XFEL construction. One of these works is developing, production, system assembling and putting in operation the power supply system for corrector magnets. Since 2012 there were developed, produced and delivered to XFEL 7 models of power supplies with up to 10 A output current and up to 70 V output voltage. Total quantity of delivered power supplies is near 400 pieces. The report presents the structure of power supply system and results of testing.

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THPSC023

Automated System for Precision Current Sources Testing

software, controls, real-time, free-electron-laser

589

E.V. Bykov, A.M. Batrakov, O.V. Belikov, Ye.A. Gusev, V.R. Kozak
BINP SB RAS, Novosibirsk, Russia

The system of beam correction for European XFEL includes about 400 precise current sources. Before including in XFEL equipment the every current source must tested and verified in concordance with specifications. For this purpose there was developed the automated system allowing to test up to 7 current sources simultaneously. The system consists of stand and software that written for linux OS. The stand was equipped by test loads, which emulated the real load, by precise DCCT and by precise analog-to-digital converters with CANbus interface. During testing the current in each current source was changed and digitized in concordance with different algorithms. The duration of typical session was 25 hours. The specific software was developed for this stand. It provides testing process, collecting and storing the primary information and displaying the first information. There are addition utilities which allows to make different analyzes in off-line mode using data accumulated during tests. The article provides a detailed description of the stand and main results.

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THPSC025

Generator of High-Voltage Pulse for High-Current Accelerator of Deuteron With Laser Starts

laser, plasma, high-voltage, cathode

594

E.D. Vovchenko, A.A. Isaev, K.I. Kozlovskiy, A.E. Shikanov
MEPhI, Moscow, Russia

The report deals with the source of pulsed high voltage, and simultaneously, source of the pulsed current for the magnetic insulation of electrons near the cathode that was developed for a high-current accelerator of deuterons with laser-plasma anode. The accelerating voltage up to 400 kV and ion current about 1 kA have been achieved. The current in the spiral inductor has reached 4 kA and it excludes breakdown between the cathode and anode for 0.5 mks. For synchronization of physical processes in accelerator of deuterons with pulsed power, the laser control is applied.

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THPSC027

Solid-State Modulators for Particle Accelerators

klystron, linac, controls, high-voltage

600

A.A. Zavadtsev, D. Churanov, D.A. Zavadtsev, D.A. Zybin
Nano, Moscow, Russia

A series of the wide parameter range solid-state high-voltage modulators has been developed and built as a power supplies for the magnetrons and the klystrons in the particle accelerators. The series includes 60 kV/100 A/6 μs modulator with pulse transformer for 3 MW magnetron, 60 kV/300 A/6 μs direct switch modulator for 6 MW multi-beam klystron, 110 kV/80A/6 μs direct switch modulator for 3 MW klystron, 130 kV/100 A/6 μs modulator with pulse transformer for 5 MW klystron, 250 kV/250 A/6 μs modulator with pulse transformer for 20 MW klystron. The last modulator is under construction. All other modulators have been supplied to customers in Russia as well as in Europe.

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THPSC029

300 kV High-Voltage Source With Up to 15 kW Output Power

high-voltage, controls, operation, interface

606

D.V. Senkov, I.A. Gusev, A.Yu. Protopopov, D.N. Pureskin, M.A. Scheglov
BINP SB RAS, Novosibirsk, Russia

The presented report contains the description of high-voltage source with output voltage up to 300 kV and output current up to 50 mA. The source consist of the chopper with IGBT switches working with a principle of pulse-width modulation and the full H-bridge converter with IGBT switches, both working on programmed from 15 to 25 kHz frequency, and the high voltage transformer powering the eight-stage multiplier with the additional capacity filter at output. The transformer and multiplier both are made in common volume separated on oil tank part with silicon oil for transformer and SF6 part for multiplier. The additional capacity filter provides low ripple and noise level in working range of output currents. The source can operate in normal mode with series of high-voltage breakdown in output voltage. In the high-voltage breakdown the released in load and matching circuit energy is less than 40 J at maximum operating voltage 300kV. The efficiency of system is more than 80% at the nominally output power 15 kW. The description of the source and the test results are presented.

Poster THPSC029 [1.218 MB]

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THPSC030

High-Precision Ramped High-Voltage Source With Up to 50 kV Output Voltage

high-voltage, feedback, booster, interface

609

D.V. Senkov, A.M. Batrakov, I.A. Gusev, A.Yu. Protopopov, A.A. Zharikov
BINP SB RAS, Novosibirsk, Russia

This report describes the precision high-voltage ramped high-voltage power system. The output voltage up to 50 kV with 10 ppm precision. The power system consists of the 3 kW high-voltage source based on multiplier, presision high-voltage divider with digital interface and high-voltage discharge switch to provide low ramp-down time for output voltage. The power system is planed to use in the NIKA booster electron cooler project. The description and test results are presented.

Poster THPSC030 [1.985 MB]

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THPSC033

Obtainment of 5 mA 2 MeV Proton Beam in the Vacuum Insulation Tandem Accelerator

ion, proton, vacuum, tandem-accelerator

618

I.M. Shchudlo, D.A. Kasatov, A.M. Koshkarev, A.N. Makarov, Y.M. Ostreinov, I.N. Sorokin, S.Yu. Taskaev
BINP SB RAS, Novosibirsk, Russia

Funding: The study was supported by the grants from the Russian Science Foundation (Project No.14-32-00006), Budker Nuclear Institute and Novosibirsk State University
In BINP the neutron source for BNCT based on proton accelerator was designed and built. It is necessary for the therapy to ensure a stable proton beam current of not less than 3 mA with energy 2 MeV. During the injection of negative hydrogen ion beam into the accelerator the unwanted charged particles are produced, affecting the stability of beam parameters. The article describes meth-ods of suppression of undesirable charged particles and the results of experiments.

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THPSC037

Loss Analysis of Insulated Core Transformer High Voltage Power Supply

high-voltage, power-supply, radiation, electronics

620

Y.F. Zhang, J. Huang, M.K. Li, H. Liang, W. Qi, Y.Q. Xiong, J. Yang, L.G. Zhang, C. Zuo
HUST, Wuhan, People's Republic of China
T. Yu
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China

Insulated core transformer (ICT) electron accelerator is an ideal prototype in low energy radiation processing industry, and ICT high voltage power supply is the essential apparatus. Conventional ICT high voltage power supply uses laminated silicon steel sheets as magnetic cores and works at 50 Hz. In a novel design of the ICT high voltage power supply, the magnetic cores made of ferrite material are adopted to increase the frequency and improve the performance. Focusing on the new scheme, the loss calculation of the high voltage power supply was carried out. The loss of ferrite magnetic cores and the windings was analysed and simulated.

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THPSC038

A Novel Design of Insulated Core Transformer High Voltage Power Supply

power-supply, high-voltage, controls, software

623

M.K. Li, K. Fan, M. Fan, J. Huang, H. Liang, W. Qi, Y.Q. Xiong, J. Yang, L. Yang, L.G. Zhang, Y.F. Zhang, C. Zuo
HUST, Wuhan, People's Republic of China
T. Yu
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China

Insulated core transformer (ICT) high voltage power supply is an ideal model for industrial radiation accelerator at energy below 1MeV. Compared to the traditional scheme, a novel ICT high voltage power supply was put forward. Conventional silicon steel sheets were replaced with manganese zinc ferrites, raising working frequency from 50Hz to thousand hertz. Magnetic structure was changed from three-phase structure to four-phase structure. Accordingly, excitation voltage was changed from three-phase sinusoidal wave to square wave. Polyimide was chosen as insulation material instead of teflon or mica. A prototype of 400kV/50mA was designed, simulated and verified with the aid of finite element analysis software. To optimize the voltage distribution, corresponding flux compensation methods were raised to solve the problem of flux leakages.

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THPSC043

Series Magnetic Measurements Of NICA Booster Dipoles

dipole, booster, coupling, quadrupole

629

V.V. Borisov, A.V. Bychkov, A.M. Donyagin, O. Golubitsky, H.G. Khodzhibagiyan, S.A. Kostromin, M.M. Omelyanenko, M.M. Shandov
JINR, Dubna, Moscow Region, Russia
A.V. Shemchuk
JINR/VBLHEP, Dubna, Moscow region, Russia

NICA booster magnetic system consists of 40 dipole and 48 quadrupole superconducting (SC) magnets. Measurement of magnetic field parameters is assumed for each booster magnets. At the moment six series dipole magnets are assembled and have passed all tests. Booster dipole magnets are 2.14 m-long, 128 /65 mm (h/v) aperture magnets with design similar to Nuclotron dipole magnet but with curved (14.1 m radius) yoke. They will produce fields up to 1.8 T. The magnetic field parameters will be measured at "warm" (300 K) and "cold" (4.5 K) conditions. The obtained results of magnetic measurements of first five magnets are summarized here.

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THPSC046

High-Power High-Temperature Graphite Beam Dump for E-Beam Irradiation Test of Prototype IF Target in RISP

target, simulation, scattering, experiment

632

V. Gubin
Institute of Laser Physics, SB RAS, Novosibirsk, Russia
J.Y. Kim, J.-W. Kim, Y.H. Park
IBS, Daejeon, Republic of Korea
Yu. Maltseva, P.V. Martyshkin
BINP SB RAS, Novosibirsk, Russia

Nowadays project RISP is developed in IBS, Daejeon. One of the main project device is graphite target system meant for production of rare isotopes by means of the in-flight fragmentation (IF) technique. The power inside the target system deposited by the primary beam with energy of 200 MeV/u is estimated to be around 100 kW. The target represents rotating multi-slice graphite disc cooled by thermal radiation. Necessary step of target development is integrated test of target prototype under high power electron beam modelling real energy deposit into target. This test is planned to be held in BINP, Novosibirsk, with the use of ELV-6 accelerator. Heavy-ion beam will be modelled by the e^- beam of ELV-6 accelerator with diameter down to ~1 mm and energy 800 keV (minimum possible). IF target is not full stopping target for an electron beam with energy 800 keV. Considerable part of beam energy will be not absorbed by a target material and must be deposited into special beam dump. In this paper the design of beam dump of the graphite cone geometry cooled by thermal irradiation is described.

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THPSC047

A Faraday Cup for a Low Charge LWFA Electron Beam Measurement

laser, simulation, acceleration, plasma

635

V. Gubin, V.I. Trunov
Institute of Laser Physics, SB RAS, Novosibirsk, Russia
V.V. Gambaryan, A.E. Levichev, Yu. Maltseva, P.V. Martyshkin, A.A. Pachkov, S.N. Peshekhonov
BINP SB RAS, Novosibirsk, Russia

Nowadays laser wakefield acceleration (LWFA) is considered as one a perspective method for GeV electron beam production. Combination of laser accelerated electrons and Compton backscattering of probe light beam opens possibility to create the table top source of femtosecond light beam in x-ray and gamma range. Project of laser-driven Compton light source started in ILP SB RAS in collaboration with BINP SB RAS. Production of 1-10 pC electron beams sub-ps time range duration with energies up to 100 MeV is expected as a result of the first stage of the project. Since energy of electrons does not exceed of 100 MeV, it allows using Faraday cup (FC) with reasonable dimensions, instead of commonly used integrating current transformer (ICT). Geometry of FC was optimized taking into account of beam stopping simulation as well as low capacity requirement. RF properties, simulation of the system operation were carried out. System has been tested at the VEPP-5 electron linac. Results of development and testing of this FC are presented.

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THPSC048

Measurement of Gamma Beams Profile by Cherenkov Radiation in Fibers

radiation, photon, experiment, betatron

638

A.V. Vukolov, A.I. Novokshonov, A. Potylitsyn, E. Shuvalov, S.R. Uglov
TPU, Tomsk, Russia

Funding: This work was partially supported by the Russian Ministry of Education and Science within the program 'Nauka' Grant 3.709.2014/K and by RFBR Grant 15-52-50028-YaF_a.
Results of gamma beam profile experimental investigations by measuring of Cherenkov radiation* generated in a fiber with 0.6 mm thickness and in a glass rod with 5 mm diameter are presented. These experiments were carried out on bremsstrahlung beam of the linear accelerator 'Philips SL-75' with 6 MeV energy and 4 Gr/min dose rate at 1 m distance. In works ** and *** authors have showed feasibility of Cherenkov radiation applying for high energy beam diagnostics. In our work the Cherenkov radiation yield dependence on the fiber orientation relative to the beam axis was investigated and showed that the maximal light yield corresponds to the angle between fiber and beam axes closed to the Cherenkov angle. When dose rate is higher than 1 Gr/min at 1 m distance one can register a light yield for the fiber orientation even less than Cherenkov angle. We suppose that the observed effect is connected with generating of electromagnetic shower by initial photons. Proposed technique of bremsstrahlung and electron **** beams profile measurements differs from well-known techniques based on ionization chambers due to its insensitive to low energy part of the bremsstrahlung spectrum and to undesirable background. Using this technique for beam profile scanning it is possible to construct compact and noise insensitive device relative to the well-known systems. It is also possible to reach submillimeter resolution with this device.
* Jelley J V, Cherenkov Radiation and its Application, 1958, Pergamon Press.
** Wulf F, Korfer M, Proc. of DIPAC 2009, p. 411.
*** A. Murokh, R. Agustsson etc., Proc of IPAC2012, p.996.
**** A V Vukolov, A I Novokshonov, A P Potylitsyn, S R Uglov, Proc of RREPS-15, 2015, Sain-Petersburg

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THPSC051

The Magnetic Energy Analyzer for Electron Beam Of LUE-200 Linac of IREN Facility

detector, vacuum, target, linac

647

A.P. Sumbaev, V.I. Shokin, N.I. Tarantin
JINR, Dubna, Moscow Region, Russia

Theses for a base substantiation, results of the calculation for the electron optical parameters and design features of the magnetic energy analyzer for the beam of the electron LUE-200 linac are presented. The static dipole magnet with homogeneous transverse field and with a combined functions (the functions of a spectrometer and of a spectrograph) established after the second accelerating section, allows to spend measurements in a wide energy range of the analyzed particles up to 224 MeV with the instrumentation resolution not worse ± 5 %.

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THPSC052

The Longitudinal Broadband Impedance and Energy Spread Measurements at VEPP-4M

impedance, synchrotron, damping, scattering

650

V.M. Borin, V.A. Kiselev, G.Y. Kurkin, O.I. Meshkov, S.A. Nikitin, M.A. Skamarokha
BINP SB RAS, Novosibirsk, Russia
V.L. Dorokhov
BINP, Novosibirsk, Russia

The paper presents studies of the longitudinal broadband impedance of VEPP-4M and measurements of its bunch energy spread at different energies in range of 1.45 - 3.5 GeV. In order to measure the longitudinal bunch size at different currents we used PS-1/S1 streak camera with picosecond temporal resolution. Considering that influence of collective effects is negligible at low currents we determined bunch energy spread from its length at low currents. Collected bunch length data demonstrate microwave instability thresholds and potential well distortion lengthening. Potential well distortion was studied at 3 GeV and 3.5 GeV. Measured potential well distortion lengthening was used to estimate a value of the reactive part of the longitudinal impedance. Observed microwave instability thresholds was used to measure the value of broadband impedance. Measured value of the VEPP-4M is 7.9 ± 1.5 Ohm.

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THPSC055

Electrodynamic Characteristics of RF-Deflector for Bunch Shape Monitor

simulation, cavity, impedance, insertion

659

D.A. Chermoshentsev, A. Feschenko, S.A. Gavrilov
RAS/INR, Moscow, Russia
D.A. Chermoshentsev
MIPT, Dolgoprudniy, Moscow Region, Russia
D.A. Chermoshentsev
Skoltech, Moscow, Russia

Bunch shape monitors, based on a transverse RF-scanning of secondary electrons, are used for measurements of particles longitudinal distribution in bunches at different linear ion accelerators. The phase resolution of such monitors depends crucially on accuracy of fabrication and tuning of RF-deflector, thus preliminary simulations of its electrodynamic characteristics are of importance for subsequent commissioning of the monitor. Simulations of some basic operational electrodynamic parameters and results of experimental measurements are presented.

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THPSC057

Application of Model Independent Techniques at VEPP-2000 and SIS100

damping, betatron, collider, experiment

664

D.V. Rabusov, Yu. A. Rogovsky
BINP SB RAS, Novosibirsk, Russia

In order to exploit an accelerator successfully all parameters should be set correctly. To check and fix errors in the accelerator lattice measurements of parameters of the betatron motion and measurements of optical functions of the accelerator lattice are used. Due to Model Independent Analysis it is possible to carry out measurements of the beta-function and the phase advance fast. Using NAFF technique lets us compute betatron tune with good precision. Limiting capabilities of the MIA at SIS100 project are discussed, the first results of the application of MIA and NAFF techniques at booster VEPP-5 and at collider VEPP-2000 are shown.

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THPSC059

Thermal Loads of Wire-Based Beam Instrumentation at Ion Linacs

ion, proton, instrumentation, niobium

670

M.M. Churaev, S.A. Gavrilov
RAS/INR, Moscow, Russia
M.M. Churaev
Skoltech, Moscow, Russia
M.M. Churaev
MIPT, Dolgoprudniy, Moscow Region, Russia

Wire-based beam instrumentation remains a reference for calibration of many other instruments, providing direct and accurate measurements with high resolution. However beam power increasing of existing and forthcoming ion linacs results in strict constraints on operation modes acceptable for control and diagnostics. Relevant simulations of wire thermal loads are necessary not only for a mode choice, but also for a preliminary design of such instrumentation. Simulations for different wire materials and various beam parameters are made. Features of the model are discussed. Numerical estimations and conclusions are presented in comparison with some experimental results.

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THPSC060

The Longitudinal Distribution and Bunch Length Measurements at VEPP-2000 Collider

collider, cavity, impedance, detector

673

Yu. A. Rogovsky, E. Perevedentsev, V. Volkov, Yu.M. Zharinov
BINP SB RAS, Novosibirsk, Russia

The paper describes the bunch length measurement system for VEPP-2000 collider, equiped with optical analysers based on LI-602 dissector, which provides permanent measurements of the longitudinal beam profile. Potential well distorsion lengthening was measured at different bunch currents for the energies below 500 MeV. First measurements reveals the presence of microwave instabilty with turbulent emittance growth. The thresholds of these processes was used to estimate the values of reactive part of the longitudinal impedance. Measured energy loss factors was compared with computer simulations for the RF cavity. All results will be discussed and further estimations will be given.

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THPSC063

System of Thermomonitoring and Thermostabilizing of Kurchatov Synchrotron Radiation Source

controls, radiation, synchrotron, synchrotron-radiation

680

N.I. Moseiko, E.V. Kaportsev, K. Moseev, A.G. Valentinov
NRC, Moscow, Russia
Y.V. Krylov
RRC, Moscow, Russia

The modern system of thermomonitoring and thermostabilizing (TERMOCS) of KSRS - Kurchatov synchrotron radiation source is described. The TERMOCS system provides: a monitoring of temperatures of the magnets and RF-resonators of KSRS; informing operator on violations of the course of technological process; data protection from illegal access; an archiving and displaying of archive data in a trend type. The system includes 480 temperature sensors of the AD592 type, providing the accuracy of measurements 0,2 C. System of thermo stabilizing of the linear accelerator - the proportional integral differentiating regulator for support of stability of temperatures at the level of 0,05 C. During creation of the system the modern decisions on the basis of the modular complexes of NI, the modern servers and the Citect SCADA software system were used.

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THPSC065

Diagnostics of Accelerator Beams by the Dependence of the Vavilov-Cherenkov Radiation Intensity on the Refractive Index of the Radiator "n"

photon, detector, radiation, microtron

686

K.A. Trukhanov
SSC RF- IBMP RAS, Moscow, Russia
A.I. Larkin
NRNU, Moscow, Russia
V.I. Shvedunov
MSU, Moscow, Russia

The report presents the results of development the method TLSH* for finding of the particle speed distribution (PSD) in beams of accelerators. PSD is deduced from the Volterra integral equation of the first kind with the right part, which is by the dependence of Cherenkov radiation intensity (ChRI) from n, experimentally obtained for the given beam. PSD is the second derivative of ChRI. The problem of stability of the second derivative is solved by attracting the priori information (for example, nonnegative of the solution). Using optical dispersion of radiator is discussed. It enables to find PSD even in the single cluster of particles. The possibility of determining the PSD in the cross section beam is discussed too. The method also enables to find PSD upon a noticeable transverse speed of the particles in the beam. The method is virtually non-destructive in many cases.
*Measurement of the distributions of particle velocity in the accelerator beam on the basis of the Vavilov-Cherenkov radiation at optical and microwave ranges. Trukhanov K. A., Larkin A. I., Shvedunov V. I. Izv. RAS. Ser. Phys. 2010. V. 74, No. 11, Pp. 1665-1668.

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THPSC067

Coaxial Quarter Wavelength Impedance Converter for Coupling Control of Triode Cavity

impedance, cavity, coupling, gun

689

K. Torgasin, T. Kii, K. Masuda, K. Morita, K. Nagasaki, H. Ohgaki, S. Suphakul, H. Zen
Kyoto University, Kyoto, Japan

A quarter wavelength coaxial cavity has been developed for triode-type thermionic RF gun. The triode-type RF gun is a modification of present 4.5 cell thermionic RF gun of KU-FEL (Kyoto University Free Electron Laser) facility with aim to mitigate the back'bombardment effect. Thereby a coaxial quarter wavelength cavity with cathode material shall be added to the main 4.5 cell accelerating body. The coaxial cavity has the function of pre-buncher to control the injection phase and power of electron bunches into the main accelerating body*. Transient tests have demonstrated the quarter wavelength cavity to be undercoupled. However, for operation at high beam loading conditions overcoupled conditions are required. In order to control the coupling we have developed an external air side coaxial quarter wavelength impedance converter. The design of the impedance converter enables operation at high RF power (<20 kV) without changing the cavity geometry. In this work we present our design and performance of quarter wavelength impedance converter as applied to quarter wavelength triode cavity.
* K. Torgasin et al., Cold Test of the Coaxial Cavity for Thermionic Triode Type RF Gun, in Proc. IPAC, 2013, pp.324-326.

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THPSC068

Integrated Inspection Method of Motor Transports Based on Acceleration Technology

neutron, controls, radiation, detector

692

A.M. Fialkovsky, P.O. Klinovsky, K.V. Kotenko, V.P. Malyshev, T.R. Virkunen
NIIEFA, St. Petersburg, Russia

Integrated inspection method of motor transports was suggested based on linear electron accelerator and neutron generator, which helps to detect substances forbidden for carrying, including explosives, narcotic drugs and fissionable materials. The linear high-frequency electron accelerator is a source of X-ray bremsstrahlung. The result of scanning is an introscopical image of a motor transport with color-selected suspicious substances. The neutron activation analysis of these substances with neutron generator as a neutron source lets detect elemental substance composition as well as identify explosives or narcotic drugs. This article contains accelerator specifications, which lets implement suggested method.

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THPSC072

Digital-to-Analog Beam Energy and Current Stabilization of ELV Accelerators

controls, cathode, feedback, software

700

D.S. Vorobev, E.V. Domarov, S. Fadeev, N.K. Kuksanov, A. Lavrukhin, P.I. Nemytov
BINP SB RAS, Novosibirsk, Russia

Funding: Budker Institute of Nuclear Physics, Novosibirsk, Russia.
1.Previous systems of energy and current stabilization are based on analog PID-controllers. They provide good stability at sufficient speed-work. 2.Increased requirements of technological lines to the speed of the accelerator injection to set-up parameters and introduction of technological lines, in which the accelerator is a slave device and should within the shortest possible time to respond onto the changes of operation input parameters, forced us to find the way of stabilization systems improvement. 3.New stabilization system is able to provide current output speed up to 5mA/sec, at required energy stability. 4.Digital-to-analog stabilization is produced as a superstructure on the existing system and is made as a source code added into the basic accelerator control program. This approach enables to modernize simply the existing accelerators. The code itself is two independent parts. The first part is the current beam corrector, which calculate the derivate (current speed) at a time and aims to hold it in set-up range, taking into account the difference of the tasks and the necessity of cathode warm up. The second part is a energy compensator. It adds the current derivate into accelerator energy channel, reducing the energy settlements at once. 5.Present system passed through the testing and it is already installed onto ELV-0.5(0.5MeV, 100mA) accelerator in Qingzhou (a/m tyre production) and onto ELV-8(2.5MeV, 40mA) accelerators in China for cable insulation treatment.

Poster THPSC072 [3.958 MB]

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THPSC074

Longitudinal Beam Distribution Measurements in Damping Ring of VEPP-5 Injection Complex

damping, injection, impedance, operation

705

V.V. Balakin, O. Anchugov, D.E. Berkaev, F.A. Emanov, G.Y. Kurkin, O.I. Meshkov
BINP SB RAS, Novosibirsk, Russia
V.L. Dorokhov
BINP, Novosibirsk, Russia

Injection Complex VEPP-5 was turned into operation in the end of 2015 in the Budker Institute of Nuclear Physics (Novosibirsk, Russia). The main task of the facility is production, acceleration and transportation of high intensity electron and positron beams for two BINP's colliders. Now, VEPP-5 successfully delivers electron and positron beams to the collider VEPP-2000 and ready to start operation with the acceleration complex VEPP-4M. Beam diagnostics issues are very important for VEPP-5 facility tuning during the operation. Longitudinal beam diagnostic based on synchrotron radiation in the VEPP-5 Damping Ring is presented in the article. Equipment operation principle, main measurement results and future prospects are presented in this paper.

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THPSC084

The New Control for Magnet System of KSRS

controls, software, radiation, synchrotron

727

E.V. Kaportsev, Y.V. Krylov
RRC, Moscow, Russia
K. Moseev, N.I. Moseiko, A.G. Valentinov
NRC, Moscow, Russia

The running cycle of Kurchatov Synchrotron Radiation Source (KSRS) includes the injection of electrons with energy 80 MeV from the linear accelerator in the booster storage ring Siberia-1, the accumulation of a electron current up to 400 mA and, then, electron energy ramping up to 450 MeV with the subsequent extraction of electrons in the main ring, storage ring Siberia-2, and accumulation there up to 300 mA, and at last the energy ramping up to 2.5 GeV. Several years ago, a modernization of the current system of automated control systems (ACS) has started. This article presents one of the most important parts - the new control subsystem of the magnet system

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THPSC087

Stabilization of the Equilibrium Position of a Magnetic Control System with Delay

controls, feedback, simulation, permanent-magnet

736

A.Yu. Aleksandrov, A.P. Zhabko, I.A. Zhabko
Saint Petersburg State University, Saint Petersburg, Russia
A.A. Kosov
ISDCT SB RAS, Irkutsk, Russia

Funding: The research was partially supported by the Saint Petersburg State University (project No. 9.37.157.2014), and by the Russian Foundation for Basic Research (grant Nos. 15-08-06680 and 16-01-00587-a).
Nonlinear oscillatory systems are widely applied for the modeling of charge particles motions in cyclotrons in neighborhoods of equilibrium orbits. They are also used for the analysis and synthesis of magnetic control devices. An actual problem for such systems is stabilization of their operating modes. In this report, analytical and numerical investigations of stability of the equilibrium position for a nonlinear oscillatory system are presented. The system can be treated as a mathematical model of magnetic suspension control system of a gyro rotor. A delay in the feedback control scheme and dissipative forces occurring due to energy losses at the interaction of the magnetic field with currents in the control loops are taken into account. Two approaches to the synthesis of stabilizing controls are proposed. The first one is based on the using of gyroscopic control forces. It is applicable in the case of essentially nonlinear homogeneous dissipative forces. The second approach is efficient for systems with linear dissipative forces. For this case, potential control forces are constructed. With the aid of a computer simulation of dynamics of closed-loop systems, a comparison of these approaches is fulfilled, and their features and conditions of applicability are determined.

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