RuPAC2021 - List of Keywords (vacuum)

Paper	Title	Other Keywords	Page
MOPSA13	Computer Simulation of the Mechanical Behavior of the FFS Superconducting Quadrupole Coil	quadrupole, induction, simulation, experiment	156
	A.D. Riabchikova, A.I. Ageev, Altukhov, Y.V. Altukhov, I. Bogdanov, S. Kozub, T. Ryabov, L. Tkachenko IHEP, Moscow Region, Russia
	In the frame of the work, carried out at the Research Center of the Kurchatov Institute - IHEP on the development of four wide-aperture superconducting quadrupoles, a mathematical study of the mechanical behavior of the coil block of these magnets was carried out. The quadrupoles are intended for use in the magnetic final focusing system (FFS) of the ion beam in the experiments of the HED@FAIR collaboration. At the design stage of superconducting magnets, it is necessary to perform mathematical modeling to analyze the deformation of coil blocks during the assembly stages, cooling to operating temperature and the influence of ponderomotor forces. The results of computer simulation of changes in the geometry and distribution of forces in the coil block at all these stages are necessary to determine the value of the preliminary mechanical stress in the superconducting coil. The main results of numerical simulation of the mechanics of these magnets are presented in the article.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA13
About •	Received ※ 26 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 09 October 2021
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MOPSA14	Production of Superconducting Magnets for the NICA Collider at JINR	collider, dipole, cryogenics, quadrupole	159
	S.A. Korovkin, V.V. Borisov, H.G. Khodzhibagiyan, H.G. Khodzhibagiyan, S.A. Kostromin, S.A. Kostromin, D. Nikiforov, M.V. Petrov JINR, Dubna, Moscow Region, Russia Yu.G. Bespalov, S.A. Kostromin JINR/VBLHEP, Dubna, Moscow region, Russia
	The collider structure of the NICA project includes 86 quadrupole and 80 dipole superconducting (SC) magnets. The serial production and testing of these magnets are near to completion at the Veksler and Baldin Laboratory of High Energy Physics of the Joint Institute for Nuclear Research (VBLHEP, JINR). Manufacturing and assembly technology directly affects the quality of the magnetic field. The article describes the technology behind the production of different NICA collider magnets.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA14
About •	Received ※ 29 September 2021 — Revised ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 23 October 2021
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MOPSA16	Design and Characteristics of Cryostat for Testing of Low-Beta 325 MHz Half-Wave Resonators	cavity, cryomodule, experiment, cryogenics	165
	D. Bychanok, V. Bayev, S. Huseu, S.A. Maksimenko, A.E. Sukhotski, E. Vasilevich INP BSU, Minsk, Belarus A.V. Butenko, D. Nikiforov, E. Syresin JINR, Dubna, Moscow Region, Russia M. Gusarova, M.V. Lalayan, S.M. Polozov MEPhI, Moscow, Russia V.S. Petrakovsky, A.I. Pokrovsky, A. Shvedov, S.V. Yurevich Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus
	Design of the prototype cryomodule for testing low-beta 325 MHz half-wave cavities is currently undergoing at INP BSU. The cryomodule allows performing intermediate vacuum-, temperature-, and rf-tests during the fabrication of half-wave resonators. The first experimental results of cryomodule cooling down to liquid nitrogen temperatures are presented and discussed. The pressure and temperature control allow us to estimate the main cooling/heating characteristics of the cryostat at different operation stages. The presented test cryomodule will be used for further development and production of superconductive niobium cavities for the Nuclotron-based Ion Collider fAcility (NICA) injector.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA16
About •	Received ※ 16 September 2021 — Revised ※ 18 September 2021 — Accepted ※ 23 September 2021 — Issued ※ 26 September 2021
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MOPSA17	Automated System for Heating High-Vacuum Elements of Superconducting Synchrotrons of the NICA Complex	controls, synchrotron, booster, collider	168
	A.S. Sergeev, A.N. Svidetelev JINR, Dubna, Moscow Region, Russia A.V. Butenko JINR/VBLHEP, Dubna, Moscow region, Russia
	To obtain an ultrahigh vacuum, it is necessary to preliminarily degass the "warm" sections of the vacuum system of accelerators by prolonged heating to remove water vapor and molecules of other substances adsorbed on the inner surface of the walls of the vacuum chamber. The presented system allows you to heat products with a known unknown heat capacity and thermal conductivity. Some of the accelerators of the NICA complex are supplied without their own heating system and heating is carried out by specialists directly at the accelerator site.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA17
About •	Received ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 11 October 2021
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MOPSA46	Preliminary Design Study of the Gantry for the Proton Radiotherapy Center NRC "Kurchatov Institute"	dipole, proton, quadrupole, synchrotron	196
	A.N. Chernykh, M.S. Bulatov, V.S. Khoroshkov, G.I. Klenov NRC, Moscow, Russia
	A typical proton radiation therapy center, which includes a synchrotron with a power of 250 V, a gantry unit with a 360° rotation angle, and a unit with a fixed channel has been developed at NRC "Kurchatov Institute". In report, a diagram of a magneto-optical channel of a gantry beam installation and a project of a beamline of a gantry beam installation with magnetic elements will be presented. In addition, a frame for accommodation of the magnetic elements of the considered project of the gantry beamline will be presented.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA46
About •	Received ※ 28 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 16 October 2021
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MOPSA56	Upgrades of a Vacuum Insulated Tandem Accelerator for Obtaining Required Voltage Without Breakdowns	neutron, tandem-accelerator, high-voltage, proton	228
	I.N. Sorokin, Ia.A. Kolesnikov, A.N. Makarov, I.M. Shchudlo, S.Yu. Taskaev BINP SB RAS, Novosibirsk, Russia
	Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005. Epithermal neutron source based on an electrostatic tandem accelerator of a new type - Vacuum Insulation Tandem Accelerator, and lithium neutron target has been proposed and developed at BINP* for Boron Neutron Capture Therapy** - promising method for treatment of tumors. 2 MeV proton beam was obtained in the accelerator, the neutron generation carried out with bombardment of a lithium target by protons, successful experiments on irradiation of cell cultures incubated in boron medium have been carried out, human glioblastoma grafted mice were cured. It is necessary to increase proton energy from 2 to 2.3 MeV to form a neutron beam suitable for the treatment of deep-seated tumors. It is necessary to provide the high-voltage strength of the accelerator at the potential of 1.2 MV in order to suppress dark currents to an acceptably small value. Two upgrades to obtain the required potential were consistently implemented. At first, the glass rings of the feedthrough insulator were replaced by ceramic ones doubled in height which made it possible to refuse placing the resistive divider inside. Then the smooth ceramic rings were replaced by the new ceramic rings with a ribbed outer surface. Modernization made it possible to obtain the required voltage of 1.15 MV and the proton beam current of 9 mA in the accelerator without breakdowns. The report describes in detail the modernizations carried out, presents the results of the studies, and declares the research plans. * S. Taskaev. Phys. Part. Nucl. 46 (2015) 956-990. doi: 10.1134/S1063779615060064 ** Neutron Capture Therapy: Principles and Applications. Eds.: W. Sauerwein et al. Springer, 2012.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA56
About •	Received ※ 03 September 2021 — Revised ※ 15 September 2021 — Accepted ※ 20 September 2021 — Issued ※ 11 October 2021
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TUX01	Status of the HIAF Accelerator Facility in China	ECR, injection, linac, cavity	23
	J.C. Yang, D.Q. Gao, Y. He, L.J. Mao, G.D. Shen, L.N. Sheng, L.T. Sun, Z. Xu, Y.Q. Yang, Y.J. Yuan IMP/CAS, Lanzhou, People’s Republic of China
	The High Intensity heavy-ion Accelerator Facility (HIAF) is under constructed at IMP in China. The HIAF main feature is rapid acceleration of ions in the booster synchrotron ring (BRing) with the ramping rate up to 12 T/s. The challenges are related to the systems RF cavities, dipole power supplies, vacuum etc. Works on key prototypes of the HIAF machine are ongoing at IMP. In this paper, the test results of the power supplies, RF cavities and vacuum chambers are presented. As the construction of the HIAF facility has started, an overview of the hardware developments will also be reported.
	Slides TUX01 [17.099 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUX01
About •	Received ※ 13 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 20 October 2021
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TUY01	VEPP-2000 Collider Complex Operation in 2019-2021 Runs	luminosity, collider, operation, detector	28
	M.V. Timoshenko, Yu. Aktershev, O.V. Belikov, D.E. Berkaev, D.B. Burenkov, V.P. Druzhinin, K. Gorchakov, G.V. Karpov, A.S. Kasaev, A.N. Kirpotin, S.A. Kladov, I. Koop, A.V. Kupurzhanov, G.Y. Kurkin, M.A. Lyalin, A.P. Lysenko, S.V. Motygin, A.V. Otboev, A.V. Pavlenko, E. Perevedentsev, V.P. Prosvetov, Yu.A. Rogovsky, A.M. Semenov, A.I. Senchenko, L.E. Serdakov, P.Yu. Shatunov, Y.M. Shatunov, D.B. Shwartz, V.D. Yudin, I.M. Zemlyansky, Yu.M. Zharinov BINP SB RAS, Novosibirsk, Russia S.A. Kladov, I. Koop, M.A. Lyalin, A.V. Pavlenko, E. Perevedentsev, Yu.A. Rogovsky, A.I. Senchenko, P.Yu. Shatunov, Y.M. Shatunov, D.B. Shwartz NSU, Novosibirsk, Russia Yu.A. Rogovsky Budker INP & NSU, Novosibirsk, Russia A.M. Semenov BINP & NSTU, Novosibirsk, Russia
	VEPP-2000 is the only electron-positron collider operating with a round beam permitting to increase the limit of beam-beam effects. VEPP-2000 is the compact collider with 24.4 m-circumference which has record luminosity at energy up to 1 GeV per bunch (1032 1/cm²s), magnetic fields in superconducting solenoids (13 T) and in the bending magnets (2.4 T). Collider complex experimental program of 2019-2021 was focused on several energy ranges per bunch. Energy range in the second half of 2019 was 180-300 MeV, in the first half of 2020 ¿ 935-970 MeV, in the first half of 2021 - 970-1003.5 MeV. Data taking was carried out by CMD-3 and SND detectors and operation efficiency is compared with previous runs. Luminosity was limited by beam-beam effects. 2021 year was clouded by vacuum accident and subsequent intensive degassing using beam synchrotron radiation.
	Slides TUY01 [2.449 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUY01
About •	Received ※ 11 October 2021 — Accepted ※ 13 October 2021 — Issued ※ 23 October 2021
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TUC01	Status of the Kurchatov Synchrotron Radiation Source	wiggler, controls, electron, synchrotron	55
	A.G. Valentinov, A. Belkov, Ye. 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.A. Ushakov NRC, Moscow, Russia
	The Kurchatov synchrotron radiation source goes on to operate in the range of synchrotron radiation from VUV up to hard X-ray. An electron current achieves 150 mA at 2.5 GeV, up to 12 experimental stations may function simultaneously. Improvement of the facility according Federal Program of KSRS modernization is in progress. Two 3 Tesla superconducting wigglers have been installed at main ring at 2019. They were tested with small electron beam current at 2020-2021. Wigglers’ influence on beam parameters is much closed to calculated value. Vacuum system has been upgraded at 2020. In 2021 control system will be completely modified. Manufactoring of third 181 MHz RF generator, new preliminary amplification cascades and new waveguides for all three generators continues in Budker Institute (Novosibirsk). Preparation of great modernization of the whole facility according Federal Program for science infrastructure development has been started.
	Slides TUC01 [17.060 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUC01
About •	Received ※ 24 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 09 October 2021
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TUPSB05	Longitudinal Impedance of the NICA Collider Ring and Ion Beam Stability	impedance, collider, kicker, feedback	239
	S.A. Melnikov, E.V. Ahmanova, I.N. Meshkov JINR, Dubna, Moscow Region, Russia A.V. Ivanov NSU, Novosibirsk, Russia A.V. Ivanov BINP SB RAS, Novosibirsk, Russia M.Yu. Korobitsina, K.G. Osipov JINR/VBLHEP, Dubna, Moscow region, Russia
	The report presents the results of optimization of the longitudinal coupling impedance of the NICA collider ring using numerical simulation of its individual elements by the CST Studio. Based on the obtained results, analytical estimates of the stability of the ion beam in the ring are obtained for one energy value - 3 GeV/u.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB05
About •	Received ※ 27 September 2021 — Revised ※ 04 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 14 October 2021
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WED05	Nondestructive Diagnostics of Accelerated Ion Beams With MCP-Based Detectors at the Accelerator Complex NICA. Experimental Results and Prospects	detector, electron, booster, diagnostics	82
	A.A. Baldin, V.I. Astakhov, A.V. Beloborodov, D.N. Bogoslovsky, A.N. Fedorov, P.R. Kharyuzov, A.P. Kharyuzova, D.S. Korovkin, A.B. Safonov JINR, Dubna, Russia
	Funding: This work was supported in part by the Russian Foundation for Basic Research, project no.18-02-40097. Non-destructive ion beam detectors based on micro-channel plates are presented. The design of two-coordinate profilometer situated in the high vacuum volume of the Booster ring is discussed. Experimental data on registration of circulating beam of the Booster in the second run (September 2021) are presented. The possibility of adjustment of the electron cooling system with the help of this detector based on the obtained ex-perimental data is discussed.
	Slides WED05 [5.105 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WED05
About •	Received ※ 05 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 12 October 2021
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WEPSC08	Vacuum Condition Simulations for Vacuum Chambers of Synchrotron Radiation Source	radiation, storage-ring, synchrotron, synchrotron-radiation	358
	S.M. Polozov, V.S. Dyubkov, A.S. Panishev, V.L. Shatokhin MEPhI, Moscow, Russia V.S. Dyubkov, S.M. Polozov, V.L. Shatokhin NRC, Moscow, Russia
	Analysis of gas loads for the vacuum system chambers of the 6GeV synchrotron radiation (SR) source are carried out. The main source of gas loads is the photostimulated desorption induced by SR. The influence of storage ring lattice, geometric dimensions and beam parameters on the vacuum conditions in SR-source prototype chambers is studied. The geometric model of the storage ring chamber designed for simulation is considered. The simulation of the radiation flux parameters generated by the charged particles passing through the section of the vacuum chamber has been performed. The technique of calculating the parameters of SR and photostimulated desorption by means of Synrad+ and Molflow+ codes is applied.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC08
About •	Received ※ 27 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 18 October 2021
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WEPSC10	Optimization of Accelerators Vacuum Structures Pumping	rfq, simulation, beam-transport, cavity	361
	S.M. Polozov, A.S. Panishev, V.L. Shatokhin MEPhI, Moscow, Russia
	The pumping features for the complex parts of the accelerator vacuum system are modeled to growth the efficiency of vacuum pumping. The vacuum system of a 7.5 MeV/nucleon proton and light ion (A/Z<3.2) accelerator-injector was considered. The Monte Carlo method is suitable for molecular flow modeling in high vacuum. The Molflow+ program was used for this aim. The pressure distribution simulation over the RFQ, IH resonators chambers volume, connecting vacuum pipes and extended vacuum tracts is carried out. The influence of parameters of individual structural elements changes was investigated to define the vacuum conditions inside the accelerators vacuum chambers. The vacuum system configuration and parameters are selected basing on these results to obtain the required vacuum level.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC10
About •	Received ※ 27 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 14 October 2021
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WEPSC28	Optical Diagnostics of 1 MeV Proton Beam in Argon Stripping Target of a Tandem Accelerator	diagnostics, neutron, proton, tandem-accelerator	393
	A.N. Makarov, S. Savinov, I.M. Shchudlo, S.Yu. Taskaev BINP SB RAS, Novosibirsk, Russia S.Yu. Taskaev NSU, Novosibirsk, Russia
	Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005. A neutron source for boron neutron capture therapy based on a vacuum-insulated tandem accelerator has been developed and operates at Budker Institute of Nuclear Physics. Conducting a ~10 mm proton beam with a power of up to 20 kW through a system of accelerating electrodes and 16 mm argon stripping tube is not an easy task. Any mistake made by operator or a malfunction of the equipment responsible for the correction of the beam position in the ion beam line can lead to permanent damage to the accelerator. To determine the position of the proton beam inside the argon stripping tube, optical diagnostics have been developed based on the Celestron Ultima 80-45 telescope and a cooled mirror located at an angle of 45 degrees to the beam axis in the straight-through channel of the bending magnet. The cooled mirror also performs the function of measuring the neutral current due to the electrical isolation of the mirror and the extraction of secondary electrons from its surface. The luminescence of a beam in the optical range, observed with the help of the developed diagnostics, made it possible for the first time to determine beam size and position inside the stripping tube with an accuracy of 1 mm. The light sensitivity of the applied optical elements is sufficient for using a shutter speed from 2 to 20 ms to obtain a color image of the beam in real time. This makes it possible to realize a fast interlock in case of a sudden displacement of the beam.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC28
About •	Received ※ 24 September 2021 — Revised ※ 26 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 04 October 2021
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WEPSC31	2D-Tomography of the Proton Beam in the Vacuum Insulated Tandem Accelerator	proton, target, tandem-accelerator, neutron	402
	M.I. Bikchurina, Ia.A. Kolesnikov, I.M. Shchudlo, S.Yu. Taskaev BINP SB RAS, Novosibirsk, Russia S. Savinov BINP, Novosibirsk, Russia
	Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005. For the development of a promising method for the treatment of malignant tumors - boron neutron capture therapy - the accelerator-based epithermal neutron source has been proposed and created in the Budker Institute of Nuclear Physics. If the parameters of the proton beam change (energy and current of the beam, the parameters of the ion-optical system, the parameters of the ion source) - accordingly the conditions for the beam transportation change (its size, angular divergence, and position relative to the axis of the accelerator). For optimal conduction of the beam along the beam line, two-dimensional tomography of the beam can be used: using a cooled diaphragm with a diameter of several millimeters installed on a vacuum three-dimensional motion input and a Faraday cup, fast chord measurements are carried out, on the basis of which the beam profile is restored. The beam profile obtained by this way is somewhat different from the profile obtained by measuring the phase portrait of the beam using a wire scanner. The advantage of this method is a relatively short time to restore the profile, depending on the diameter of the cooled diaphragm. M. Bikchurina, at al. Measurement of the phase portrait and emittance of the proton beam and neutral atoms in the accelerator based epithermal neutrons source. These proceedings.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC31
About •	Received ※ 21 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 09 October 2021
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WEPSC32	Proton Beam Size Diagnostics Used in the Vacuum Insulated Tandem Accelerator	proton, target, neutron, tandem-accelerator	404
	Ia.A. Kolesnikov, M.I. Bikchurina, D.A. Kasatov, A.M. Koshkarev, A.N. Makarov, Y.M. Ostreinov, I.M. Shchudlo, E.O. Sokolova, I.N. Sorokin, S.Yu. Taskaev BINP SB RAS, Novosibirsk, Russia T.A. Bykov Budker INP & NSU, Novosibirsk, Russia S. Savinov BINP, Novosibirsk, Russia
	Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005. For the development of a promising method for the treatment of malignant tumors - boron neutron capture therapy - the accelerator-based epithermal neutron source has been proposed and created in the Budker Institute of Nuclear Physics. After the acceleration phase, a proton beam with an energy of up to 2.3 MeV and a current of up to 10 mA is transported in a high-energy beam line. With a beam size of 1 cm², its power density can reach tens of kW/cm². Diagnostics of the size of such a powerful beam is a nontrivial task aimed at increasing the reliability of the accelerator. The paper presents such diagnostics as: 1) the use of the blister formation boundary during the implantation of protons into the metal; 2) the use of thermocouples inserted into the lithium target; 3) the use of the melting boundary of the lithium layer when it is irradiated with a beam; 4) the use of the activation of the lithium target by protons; 5) the use of video cameras; 6) the use of an infrared camera; 7) the use of the luminescence effect of lithium when it is irradiated with protons; 8) the use of collimators with a small diameter of 1-2 mm; 9) the use of the method of two-dimensional tomography. M. Bikchurina, et al 2D tomography of the proton beam in the vacuum-insulated tandem accelerator. These proceedings.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC32
About •	Received ※ 22 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 19 October 2021
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FRA02	Cyclotron of Multicharged Ions	cyclotron, injection, resonance, radiation	96
	Yu.K. Osina, A. Akimova, A.V. Galchuck, Yu.N. Gavrish, S.V. Grigorenko, V.I. Grigoriev, M.L. Klopenkov, R.M. Klopenkov, L.E. Korolev, K.A. Kravchuk, A.N. Kuzhlev, I.I. Mezhov, V.G. Mudrolyubov, K.E. Smirnov, Yu.I. Stogov, S.S. Tsygankov, M.V. Usanova NIIEFA, St. Petersburg, Russia
	The JSC "NIIEFA" is designing a cyclotron system intended to accelerate ions with a mass-to-charge ratio of 3-7 in the energy range of 7.5-15 MeV per nucleon. The variety of ions, the range of changes in their energy, and the intensity of the beams provide conditions for a wide range of basic and applied research, including for solving a number of technological tasks. The cyclotron electromagnet has an H-shaped design with a pole diameter of 4 meters and a four-sector mag-netic structure. In the basic mode, the dependence of the induction on the radius corresponding to the isochronous motion is realized by turning on the main coil only through the shape of the central plugs, sector side plates, and sector chamfers. For other modes of isochronous ac-celeration, the current in the main coil is changed and cor-rection coils are tuned. The resonance system consists of two resonators with an operating frequency adjustable from 13 to 20 MHz. The final stage of the RF generator is installed close to the resonator and is connected to it by a conductive power input device. The external injection system generates and separates ions with a given A/z ratio. The injection energy is chosen such that the Larmor radius is constant, which allows us-ing an inflector of unchanged geometry for the entire list of ions. The transportation system forms beams of accelerated ions with specified parameters and delivers them to sample irradiation devices. Computer control of the cyclotron is provided.
	Slides FRA02 [11.588 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRA02
About •	Received ※ 24 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 20 October 2021
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FRB01	Advances in the Development of a Vacuum Insulated Tandem Accelerator and Its Applications	neutron, proton, target, tandem-accelerator	108
	S.Yu. Taskaev, A.A. Ivanov, D.A. Kasatov, Ia.A. Kolesnikov, A.N. Makarov, I.M. Shchudlo, I.N. Sorokin BINP SB RAS, Novosibirsk, Russia T.A. Bykov Budker INP & NSU, Novosibirsk, Russia A.M. Koshkarev, E.O. Sokolova NSU, Novosibirsk, Russia G. Ostreinov Budker Institute of Nuclear Physics, Novosibirsk, Russia
	Funding: This research was supported by Russian Science Foundation, grant No. 19-72-30005. A compact accelerator-based neutron source has been proposed and created at the Budker Institute of Nuclear Physics in Novosibirsk, Russia. An original vacuum insulated tandem accelerator (VITA) is used to provide a proton/deuteron beam. As a result of scientific research and modernization, the power of the ion beam was increased, an operation mode without high-voltage breakdowns was achieved, and the operation of the accelerator in a wide range of changes in the energy and current of ions was ensured. The proton/deuteron beam energy can be varied within a range of 0.6-2.3 MeV, keeping a high-energy stability of 0.1%. The beam current can also be varied in a wide range (from 0.3 mA to 10 mA) with high current stability (0.4%). VITA is used to obtain epithermal neutrons for the development of boron neutron capture therapy, thermal neutrons for the determination of impurities in ITER materials by activation analysis method; fast neutrons for radiation testing of materials; 478 keV photons to measure the 7Li(p, p’g)7Li reaction cross section, etc. VITA is planned to be used for boron imaging with monoenergetic neutron beam, for characterizing of neutron detectors designed for fusion studies, for in-depth investigation of the promising 11B(p, alfa)alfa alfa neutronless fusion reaction, for studying the crystal structure of materials by neutron diffraction, etc.
	Slides FRB01 [12.326 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRB01
About •	Received ※ 10 September 2021 — Revised ※ 23 September 2021 — Accepted ※ 29 September 2021 — Issued ※ 15 October 2021
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Paper

Title

Other Keywords

Page

MOPSA13

Computer Simulation of the Mechanical Behavior of the FFS Superconducting Quadrupole Coil

quadrupole, induction, simulation, experiment

156

A.D. Riabchikova, A.I. Ageev, Altukhov, Y.V. Altukhov, I. Bogdanov, S. Kozub, T. Ryabov, L. Tkachenko
IHEP, Moscow Region, Russia

In the frame of the work, carried out at the Research Center of the Kurchatov Institute - IHEP on the development of four wide-aperture superconducting quadrupoles, a mathematical study of the mechanical behavior of the coil block of these magnets was carried out. The quadrupoles are intended for use in the magnetic final focusing system (FFS) of the ion beam in the experiments of the HED@FAIR collaboration. At the design stage of superconducting magnets, it is necessary to perform mathematical modeling to analyze the deformation of coil blocks during the assembly stages, cooling to operating temperature and the influence of ponderomotor forces. The results of computer simulation of changes in the geometry and distribution of forces in the coil block at all these stages are necessary to determine the value of the preliminary mechanical stress in the superconducting coil. The main results of numerical simulation of the mechanics of these magnets are presented in the article.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA13

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Received ※ 26 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 09 October 2021

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MOPSA14

Production of Superconducting Magnets for the NICA Collider at JINR

collider, dipole, cryogenics, quadrupole

159

S.A. Korovkin, V.V. Borisov, H.G. Khodzhibagiyan, H.G. Khodzhibagiyan, S.A. Kostromin, S.A. Kostromin, D. Nikiforov, M.V. Petrov
JINR, Dubna, Moscow Region, Russia
Yu.G. Bespalov, S.A. Kostromin
JINR/VBLHEP, Dubna, Moscow region, Russia

The collider structure of the NICA project includes 86 quadrupole and 80 dipole superconducting (SC) magnets. The serial production and testing of these magnets are near to completion at the Veksler and Baldin Laboratory of High Energy Physics of the Joint Institute for Nuclear Research (VBLHEP, JINR). Manufacturing and assembly technology directly affects the quality of the magnetic field. The article describes the technology behind the production of different NICA collider magnets.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA14

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Received ※ 29 September 2021 — Revised ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 23 October 2021

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MOPSA16

Design and Characteristics of Cryostat for Testing of Low-Beta 325 MHz Half-Wave Resonators

cavity, cryomodule, experiment, cryogenics

165

D. Bychanok, V. Bayev, S. Huseu, S.A. Maksimenko, A.E. Sukhotski, E. Vasilevich
INP BSU, Minsk, Belarus
A.V. Butenko, D. Nikiforov, E. Syresin
JINR, Dubna, Moscow Region, Russia
M. Gusarova, M.V. Lalayan, S.M. Polozov
MEPhI, Moscow, Russia
V.S. Petrakovsky, A.I. Pokrovsky, A. Shvedov, S.V. Yurevich
Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus

Design of the prototype cryomodule for testing low-beta 325 MHz half-wave cavities is currently undergoing at INP BSU. The cryomodule allows performing intermediate vacuum-, temperature-, and rf-tests during the fabrication of half-wave resonators. The first experimental results of cryomodule cooling down to liquid nitrogen temperatures are presented and discussed. The pressure and temperature control allow us to estimate the main cooling/heating characteristics of the cryostat at different operation stages. The presented test cryomodule will be used for further development and production of superconductive niobium cavities for the Nuclotron-based Ion Collider fAcility (NICA) injector.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA16

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Received ※ 16 September 2021 — Revised ※ 18 September 2021 — Accepted ※ 23 September 2021 — Issued ※ 26 September 2021

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MOPSA17

Automated System for Heating High-Vacuum Elements of Superconducting Synchrotrons of the NICA Complex

controls, synchrotron, booster, collider

168

A.S. Sergeev, A.N. Svidetelev
JINR, Dubna, Moscow Region, Russia
A.V. Butenko
JINR/VBLHEP, Dubna, Moscow region, Russia

To obtain an ultrahigh vacuum, it is necessary to preliminarily degass the "warm" sections of the vacuum system of accelerators by prolonged heating to remove water vapor and molecules of other substances adsorbed on the inner surface of the walls of the vacuum chamber. The presented system allows you to heat products with a known unknown heat capacity and thermal conductivity. Some of the accelerators of the NICA complex are supplied without their own heating system and heating is carried out by specialists directly at the accelerator site.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA17

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Received ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 11 October 2021

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MOPSA46

Preliminary Design Study of the Gantry for the Proton Radiotherapy Center NRC "Kurchatov Institute"

dipole, proton, quadrupole, synchrotron

196

A.N. Chernykh, M.S. Bulatov, V.S. Khoroshkov, G.I. Klenov
NRC, Moscow, Russia

A typical proton radiation therapy center, which includes a synchrotron with a power of 250 V, a gantry unit with a 360° rotation angle, and a unit with a fixed channel has been developed at NRC "Kurchatov Institute". In report, a diagram of a magneto-optical channel of a gantry beam installation and a project of a beamline of a gantry beam installation with magnetic elements will be presented. In addition, a frame for accommodation of the magnetic elements of the considered project of the gantry beamline will be presented.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA46

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Received ※ 28 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 16 October 2021

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MOPSA56

Upgrades of a Vacuum Insulated Tandem Accelerator for Obtaining Required Voltage Without Breakdowns

neutron, tandem-accelerator, high-voltage, proton

228

I.N. Sorokin, Ia.A. Kolesnikov, A.N. Makarov, I.M. Shchudlo, S.Yu. Taskaev
BINP SB RAS, Novosibirsk, Russia

Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005.
Epithermal neutron source based on an electrostatic tandem accelerator of a new type - Vacuum Insulation Tandem Accelerator, and lithium neutron target has been proposed and developed at BINP* for Boron Neutron Capture Therapy** - promising method for treatment of tumors. 2 MeV proton beam was obtained in the accelerator, the neutron generation carried out with bombardment of a lithium target by protons, successful experiments on irradiation of cell cultures incubated in boron medium have been carried out, human glioblastoma grafted mice were cured. It is necessary to increase proton energy from 2 to 2.3 MeV to form a neutron beam suitable for the treatment of deep-seated tumors. It is necessary to provide the high-voltage strength of the accelerator at the potential of 1.2 MV in order to suppress dark currents to an acceptably small value. Two upgrades to obtain the required potential were consistently implemented. At first, the glass rings of the feedthrough insulator were replaced by ceramic ones doubled in height which made it possible to refuse placing the resistive divider inside. Then the smooth ceramic rings were replaced by the new ceramic rings with a ribbed outer surface. Modernization made it possible to obtain the required voltage of 1.15 MV and the proton beam current of 9 mA in the accelerator without breakdowns. The report describes in detail the modernizations carried out, presents the results of the studies, and declares the research plans.
* S. Taskaev. Phys. Part. Nucl. 46 (2015) 956-990. doi: 10.1134/S1063779615060064
** Neutron Capture Therapy: Principles and Applications. Eds.: W. Sauerwein et al. Springer, 2012.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA56

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Received ※ 03 September 2021 — Revised ※ 15 September 2021 — Accepted ※ 20 September 2021 — Issued ※ 11 October 2021

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TUX01

Status of the HIAF Accelerator Facility in China

ECR, injection, linac, cavity

23

J.C. Yang, D.Q. Gao, Y. He, L.J. Mao, G.D. Shen, L.N. Sheng, L.T. Sun, Z. Xu, Y.Q. Yang, Y.J. Yuan
IMP/CAS, Lanzhou, People’s Republic of China

The High Intensity heavy-ion Accelerator Facility (HIAF) is under constructed at IMP in China. The HIAF main feature is rapid acceleration of ions in the booster synchrotron ring (BRing) with the ramping rate up to 12 T/s. The challenges are related to the systems RF cavities, dipole power supplies, vacuum etc. Works on key prototypes of the HIAF machine are ongoing at IMP. In this paper, the test results of the power supplies, RF cavities and vacuum chambers are presented. As the construction of the HIAF facility has started, an overview of the hardware developments will also be reported.

Slides TUX01 [17.099 MB]

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUX01

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Received ※ 13 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 20 October 2021

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TUY01

VEPP-2000 Collider Complex Operation in 2019-2021 Runs

luminosity, collider, operation, detector

28

M.V. Timoshenko, Yu. Aktershev, O.V. Belikov, D.E. Berkaev, D.B. Burenkov, V.P. Druzhinin, K. Gorchakov, G.V. Karpov, A.S. Kasaev, A.N. Kirpotin, S.A. Kladov, I. Koop, A.V. Kupurzhanov, G.Y. Kurkin, M.A. Lyalin, A.P. Lysenko, S.V. Motygin, A.V. Otboev, A.V. Pavlenko, E. Perevedentsev, V.P. Prosvetov, Yu.A. Rogovsky, A.M. Semenov, A.I. Senchenko, L.E. Serdakov, P.Yu. Shatunov, Y.M. Shatunov, D.B. Shwartz, V.D. Yudin, I.M. Zemlyansky, Yu.M. Zharinov
BINP SB RAS, Novosibirsk, Russia
S.A. Kladov, I. Koop, M.A. Lyalin, A.V. Pavlenko, E. Perevedentsev, Yu.A. Rogovsky, A.I. Senchenko, P.Yu. Shatunov, Y.M. Shatunov, D.B. Shwartz
NSU, Novosibirsk, Russia
Yu.A. Rogovsky
Budker INP & NSU, Novosibirsk, Russia
A.M. Semenov
BINP & NSTU, Novosibirsk, Russia

VEPP-2000 is the only electron-positron collider operating with a round beam permitting to increase the limit of beam-beam effects. VEPP-2000 is the compact collider with 24.4 m-circumference which has record luminosity at energy up to 1 GeV per bunch (1032 1/cm²s), magnetic fields in superconducting solenoids (13 T) and in the bending magnets (2.4 T). Collider complex experimental program of 2019-2021 was focused on several energy ranges per bunch. Energy range in the second half of 2019 was 180-300 MeV, in the first half of 2020 ¿ 935-970 MeV, in the first half of 2021 - 970-1003.5 MeV. Data taking was carried out by CMD-3 and SND detectors and operation efficiency is compared with previous runs. Luminosity was limited by beam-beam effects. 2021 year was clouded by vacuum accident and subsequent intensive degassing using beam synchrotron radiation.

Slides TUY01 [2.449 MB]

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUY01

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Received ※ 11 October 2021 — Accepted ※ 13 October 2021 — Issued ※ 23 October 2021

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TUC01

Status of the Kurchatov Synchrotron Radiation Source

wiggler, controls, electron, synchrotron

55

A.G. Valentinov, A. Belkov, Ye. 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.A. Ushakov
NRC, Moscow, Russia

The Kurchatov synchrotron radiation source goes on to operate in the range of synchrotron radiation from VUV up to hard X-ray. An electron current achieves 150 mA at 2.5 GeV, up to 12 experimental stations may function simultaneously. Improvement of the facility according Federal Program of KSRS modernization is in progress. Two 3 Tesla superconducting wigglers have been installed at main ring at 2019. They were tested with small electron beam current at 2020-2021. Wigglers’ influence on beam parameters is much closed to calculated value. Vacuum system has been upgraded at 2020. In 2021 control system will be completely modified. Manufactoring of third 181 MHz RF generator, new preliminary amplification cascades and new waveguides for all three generators continues in Budker Institute (Novosibirsk). Preparation of great modernization of the whole facility according Federal Program for science infrastructure development has been started.

Slides TUC01 [17.060 MB]

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUC01

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Received ※ 24 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 09 October 2021

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TUPSB05

Longitudinal Impedance of the NICA Collider Ring and Ion Beam Stability

impedance, collider, kicker, feedback

239

S.A. Melnikov, E.V. Ahmanova, I.N. Meshkov
JINR, Dubna, Moscow Region, Russia
A.V. Ivanov
NSU, Novosibirsk, Russia
A.V. Ivanov
BINP SB RAS, Novosibirsk, Russia
M.Yu. Korobitsina, K.G. Osipov
JINR/VBLHEP, Dubna, Moscow region, Russia

The report presents the results of optimization of the longitudinal coupling impedance of the NICA collider ring using numerical simulation of its individual elements by the CST Studio. Based on the obtained results, analytical estimates of the stability of the ion beam in the ring are obtained for one energy value - 3 GeV/u.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB05

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Received ※ 27 September 2021 — Revised ※ 04 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 14 October 2021

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WED05

Nondestructive Diagnostics of Accelerated Ion Beams With MCP-Based Detectors at the Accelerator Complex NICA. Experimental Results and Prospects

detector, electron, booster, diagnostics

82

A.A. Baldin, V.I. Astakhov, A.V. Beloborodov, D.N. Bogoslovsky, A.N. Fedorov, P.R. Kharyuzov, A.P. Kharyuzova, D.S. Korovkin, A.B. Safonov
JINR, Dubna, Russia

Funding: This work was supported in part by the Russian Foundation for Basic Research, project no.18-02-40097.
Non-destructive ion beam detectors based on micro-channel plates are presented. The design of two-coordinate profilometer situated in the high vacuum volume of the Booster ring is discussed. Experimental data on registration of circulating beam of the Booster in the second run (September 2021) are presented. The possibility of adjustment of the electron cooling system with the help of this detector based on the obtained ex-perimental data is discussed.

Slides WED05 [5.105 MB]

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WED05

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Received ※ 05 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 12 October 2021

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WEPSC08

Vacuum Condition Simulations for Vacuum Chambers of Synchrotron Radiation Source

radiation, storage-ring, synchrotron, synchrotron-radiation

358

S.M. Polozov, V.S. Dyubkov, A.S. Panishev, V.L. Shatokhin
MEPhI, Moscow, Russia
V.S. Dyubkov, S.M. Polozov, V.L. Shatokhin
NRC, Moscow, Russia

Analysis of gas loads for the vacuum system chambers of the 6GeV synchrotron radiation (SR) source are carried out. The main source of gas loads is the photostimulated desorption induced by SR. The influence of storage ring lattice, geometric dimensions and beam parameters on the vacuum conditions in SR-source prototype chambers is studied. The geometric model of the storage ring chamber designed for simulation is considered. The simulation of the radiation flux parameters generated by the charged particles passing through the section of the vacuum chamber has been performed. The technique of calculating the parameters of SR and photostimulated desorption by means of Synrad+ and Molflow+ codes is applied.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC08

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Received ※ 27 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 18 October 2021

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WEPSC10

Optimization of Accelerators Vacuum Structures Pumping

rfq, simulation, beam-transport, cavity

361

S.M. Polozov, A.S. Panishev, V.L. Shatokhin
MEPhI, Moscow, Russia

The pumping features for the complex parts of the accelerator vacuum system are modeled to growth the efficiency of vacuum pumping. The vacuum system of a 7.5 MeV/nucleon proton and light ion (A/Z<3.2) accelerator-injector was considered. The Monte Carlo method is suitable for molecular flow modeling in high vacuum. The Molflow+ program was used for this aim. The pressure distribution simulation over the RFQ, IH resonators chambers volume, connecting vacuum pipes and extended vacuum tracts is carried out. The influence of parameters of individual structural elements changes was investigated to define the vacuum conditions inside the accelerators vacuum chambers. The vacuum system configuration and parameters are selected basing on these results to obtain the required vacuum level.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC10

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Received ※ 27 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 14 October 2021

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WEPSC28

Optical Diagnostics of 1 MeV Proton Beam in Argon Stripping Target of a Tandem Accelerator

diagnostics, neutron, proton, tandem-accelerator

393

A.N. Makarov, S. Savinov, I.M. Shchudlo, S.Yu. Taskaev
BINP SB RAS, Novosibirsk, Russia
S.Yu. Taskaev
NSU, Novosibirsk, Russia

Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005.
A neutron source for boron neutron capture therapy based on a vacuum-insulated tandem accelerator has been developed and operates at Budker Institute of Nuclear Physics. Conducting a ~10 mm proton beam with a power of up to 20 kW through a system of accelerating electrodes and 16 mm argon stripping tube is not an easy task. Any mistake made by operator or a malfunction of the equipment responsible for the correction of the beam position in the ion beam line can lead to permanent damage to the accelerator. To determine the position of the proton beam inside the argon stripping tube, optical diagnostics have been developed based on the Celestron Ultima 80-45 telescope and a cooled mirror located at an angle of 45 degrees to the beam axis in the straight-through channel of the bending magnet. The cooled mirror also performs the function of measuring the neutral current due to the electrical isolation of the mirror and the extraction of secondary electrons from its surface. The luminescence of a beam in the optical range, observed with the help of the developed diagnostics, made it possible for the first time to determine beam size and position inside the stripping tube with an accuracy of 1 mm. The light sensitivity of the applied optical elements is sufficient for using a shutter speed from 2 to 20 ms to obtain a color image of the beam in real time. This makes it possible to realize a fast interlock in case of a sudden displacement of the beam.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC28

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Received ※ 24 September 2021 — Revised ※ 26 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 04 October 2021

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WEPSC31

2D-Tomography of the Proton Beam in the Vacuum Insulated Tandem Accelerator

proton, target, tandem-accelerator, neutron

402

M.I. Bikchurina, Ia.A. Kolesnikov, I.M. Shchudlo, S.Yu. Taskaev
BINP SB RAS, Novosibirsk, Russia
S. Savinov
BINP, Novosibirsk, Russia

Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005.
For the development of a promising method for the treatment of malignant tumors - boron neutron capture therapy - the accelerator-based epithermal neutron source has been proposed and created in the Budker Institute of Nuclear Physics. If the parameters of the proton beam change (energy and current of the beam, the parameters of the ion-optical system, the parameters of the ion source) - accordingly the conditions for the beam transportation change (its size, angular divergence, and position relative to the axis of the accelerator). For optimal conduction of the beam along the beam line, two-dimensional tomography of the beam can be used: using a cooled diaphragm with a diameter of several millimeters installed on a vacuum three-dimensional motion input and a Faraday cup, fast chord measurements are carried out, on the basis of which the beam profile is restored. The beam profile obtained by this way is somewhat different from the profile obtained by measuring the phase portrait of the beam using a wire scanner*. The advantage of this method is a relatively short time to restore the profile, depending on the diameter of the cooled diaphragm.
* M. Bikchurina, at al. Measurement of the phase portrait and emittance of the proton beam and neutral atoms in the accelerator based epithermal neutrons source. These proceedings.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC31

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Received ※ 21 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 09 October 2021

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WEPSC32

Proton Beam Size Diagnostics Used in the Vacuum Insulated Tandem Accelerator

proton, target, neutron, tandem-accelerator

404

Ia.A. Kolesnikov, M.I. Bikchurina, D.A. Kasatov, A.M. Koshkarev, A.N. Makarov, Y.M. Ostreinov, I.M. Shchudlo, E.O. Sokolova, I.N. Sorokin, S.Yu. Taskaev
BINP SB RAS, Novosibirsk, Russia
T.A. Bykov
Budker INP & NSU, Novosibirsk, Russia
S. Savinov
BINP, Novosibirsk, Russia

Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005.
For the development of a promising method for the treatment of malignant tumors - boron neutron capture therapy - the accelerator-based epithermal neutron source has been proposed and created in the Budker Institute of Nuclear Physics. After the acceleration phase, a proton beam with an energy of up to 2.3 MeV and a current of up to 10 mA is transported in a high-energy beam line. With a beam size of 1 cm², its power density can reach tens of kW/cm². Diagnostics of the size of such a powerful beam is a nontrivial task aimed at increasing the reliability of the accelerator. The paper presents such diagnostics as: 1) the use of the blister formation boundary during the implantation of protons into the metal; 2) the use of thermocouples inserted into the lithium target; 3) the use of the melting boundary of the lithium layer when it is irradiated with a beam; 4) the use of the activation of the lithium target by protons; 5) the use of video cameras; 6) the use of an infrared camera; 7) the use of the luminescence effect of lithium when it is irradiated with protons; 8) the use of collimators with a small diameter of 1-2 mm; 9) the use of the method of two-dimensional tomography*.
* M. Bikchurina, et al 2D tomography of the proton beam in the vacuum-insulated tandem accelerator. These proceedings.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC32

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Received ※ 22 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 19 October 2021

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FRA02

Cyclotron of Multicharged Ions

cyclotron, injection, resonance, radiation

96

Yu.K. Osina, A. Akimova, A.V. Galchuck, Yu.N. Gavrish, S.V. Grigorenko, V.I. Grigoriev, M.L. Klopenkov, R.M. Klopenkov, L.E. Korolev, K.A. Kravchuk, A.N. Kuzhlev, I.I. Mezhov, V.G. Mudrolyubov, K.E. Smirnov, Yu.I. Stogov, S.S. Tsygankov, M.V. Usanova
NIIEFA, St. Petersburg, Russia

The JSC "NIIEFA" is designing a cyclotron system intended to accelerate ions with a mass-to-charge ratio of 3-7 in the energy range of 7.5-15 MeV per nucleon. The variety of ions, the range of changes in their energy, and the intensity of the beams provide conditions for a wide range of basic and applied research, including for solving a number of technological tasks. The cyclotron electromagnet has an H-shaped design with a pole diameter of 4 meters and a four-sector mag-netic structure. In the basic mode, the dependence of the induction on the radius corresponding to the isochronous motion is realized by turning on the main coil only through the shape of the central plugs, sector side plates, and sector chamfers. For other modes of isochronous ac-celeration, the current in the main coil is changed and cor-rection coils are tuned. The resonance system consists of two resonators with an operating frequency adjustable from 13 to 20 MHz. The final stage of the RF generator is installed close to the resonator and is connected to it by a conductive power input device. The external injection system generates and separates ions with a given A/z ratio. The injection energy is chosen such that the Larmor radius is constant, which allows us-ing an inflector of unchanged geometry for the entire list of ions. The transportation system forms beams of accelerated ions with specified parameters and delivers them to sample irradiation devices. Computer control of the cyclotron is provided.

Slides FRA02 [11.588 MB]

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRA02

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Received ※ 24 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 20 October 2021

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FRB01

Advances in the Development of a Vacuum Insulated Tandem Accelerator and Its Applications

neutron, proton, target, tandem-accelerator

108

S.Yu. Taskaev, A.A. Ivanov, D.A. Kasatov, Ia.A. Kolesnikov, A.N. Makarov, I.M. Shchudlo, I.N. Sorokin
BINP SB RAS, Novosibirsk, Russia
T.A. Bykov
Budker INP & NSU, Novosibirsk, Russia
A.M. Koshkarev, E.O. Sokolova
NSU, Novosibirsk, Russia
G. Ostreinov
Budker Institute of Nuclear Physics, Novosibirsk, Russia

Funding: This research was supported by Russian Science Foundation, grant No. 19-72-30005.
A compact accelerator-based neutron source has been proposed and created at the Budker Institute of Nuclear Physics in Novosibirsk, Russia. An original vacuum insulated tandem accelerator (VITA) is used to provide a proton/deuteron beam. As a result of scientific research and modernization, the power of the ion beam was increased, an operation mode without high-voltage breakdowns was achieved, and the operation of the accelerator in a wide range of changes in the energy and current of ions was ensured. The proton/deuteron beam energy can be varied within a range of 0.6-2.3 MeV, keeping a high-energy stability of 0.1%. The beam current can also be varied in a wide range (from 0.3 mA to 10 mA) with high current stability (0.4%). VITA is used to obtain epithermal neutrons for the development of boron neutron capture therapy, thermal neutrons for the determination of impurities in ITER materials by activation analysis method; fast neutrons for radiation testing of materials; 478 keV photons to measure the 7Li(p, p’g)7Li reaction cross section, etc. VITA is planned to be used for boron imaging with monoenergetic neutron beam, for characterizing of neutron detectors designed for fusion studies, for in-depth investigation of the promising 11B(p, alfa)alfa alfa neutronless fusion reaction, for studying the crystal structure of materials by neutron diffraction, etc.

Slides FRB01 [12.326 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRB01

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Received ※ 10 September 2021 — Revised ※ 23 September 2021 — Accepted ※ 29 September 2021 — Issued ※ 15 October 2021

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