RuPAC2021 - List of Keywords (cavity)

Paper	Title	Other Keywords	Page
MOPSA02	Experimental Tests of CW Resonance Accelerator With 7.5 MeV High Intensity Electron Beam	electron, experiment, injection, resonance	132
	L.E. Polyakov, Ya.V. Bodryashkin, M.A. Guzov, I.I. Konishev, N.N. Kurapov, V.V. Kuznetsov, I.A. Mashin, V.R. Nikolaev, A.M. Opekunov, G. Pospelov, A.N. Shein, I.V. Shorikov, N.V. Zavyalov, I.V. Zhukov RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia S.A. Putevskoy, M.L. Smetanin, A.V. Telnov VNIIEF, Sarov, Russia
	CW resonance accelerator with high average power electron beam is developed at RFNC-VNIIEF. Electron energy range is varied from 1.5 to 7.5 MeV and average beam current is up to 40 mA. Electrons obtain the required energy by several passing of coaxial half-wave accelerating cavity. In this paper we present the results of electron beam dynamics simulation during its acceleration and transportation. The operating parameters of RF system, beam optics and bending magnets are determined. These parameters permit to obtain output beam with minimal current losses on each accelerating stage. As a result of carried out tests we obtained 7.5 MeV electron beam after five passes of accelerating cavity. The electron energy spectrum, average beam current, transverse beam dimensions were determined on each accelerating stage. Common beam current loss is under 10 %.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA02
About •	Received ※ 25 September 2021 — Revised ※ 26 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 21 October 2021
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MOPSA03	Calculations of Ion Dynamics and Elecrodynamics Characteristics of 800 KeV/nucleon RFQ	emittance, Windows, rfq, coupling	135
	M.A. Guzov, A.M. Opekunov, L.E. Polyakov, N.V. Zavyalov RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia M.A. Guzov, E.N. Indiushnii, Y. Lozeev, A.I. Makarov, S.M. Polozov MEPhI, Moscow, Russia M.L. Smetanin, A.V. Telnov VNIIEF, Sarov, Russia
	Accelerating structure with radio-frequency quadrupole focusing (RFQ) was observed in this research. The RFQ is aimed to bunch up, accelerate and focus 1 MeV/nucleon ions with A/Z from 1 to 3.2 (A - mass number of ion, Z - ion charge). The chemical elements from H⁺ to O5+ fill up this particle types range. The protons current is 2 mA and ion current is 1 mA. In this paper charged particle dynamics calculations, which essential for next electrodynamic cavity modeling, were performed. The electrodynamic model of 4-vane RFQ cavity with windows of magnetic connection was created. The dependence between frequency and cavity geometrics was defined. Topology of magnetic windows, which aimed to have the maximum mod separations, was determined. Different types of tanks were considered and corresponding electromagnetic characteristics were calculated. Tuning elements (plungers and spacers) influence on cavity was modeled. As a result optimized model of accelerating structure was realized.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA03
About •	Received ※ 20 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 18 October 2021
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MOPSA04	The Tuning of RF Parameters of 40 MHz RFQ	rfq, linac, coupling, Windows	139
	A. Sitnikov, G. Kropachev, T. Kulevoy, D.N. Selesnev, A.I. Semennikov ITEP, Moscow, Russia
	The new linac for A/Z = 8, output energy 4 MeV/u and 10 mA current is under development at NRC "Kurchatov Institute" - ITEP. The linac consists of Radio-Frequency Quadrupole (RFQ) and two sections of Drift Tube Linac (DTL). The 40 MHz 11 meters long RFQ is based on a 4-vane structure with magnetic coupling windows. The paper presents results of tuning radio-frequency (RF) RFQ parameters.
	Poster MOPSA04 [1.243 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA04
About •	Received ※ 24 September 2021 — Revised ※ 25 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 16 October 2021
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MOPSA06	Parameters of the Normal Conducting Accelerating Structure for the Up to 1 GeV Hadron Linacs	linac, coupling, multipactoring, hadron	142
	I.V. Rybakov, A. Feschenko, L.V. Kravchuk, V.V. Paramonov, V.L. Serov RAS/INR, Moscow, Russia
	Compensated bi-periodic accelerating structure Cut Disk Structure (CDS) was developed for accelerating particle beams at beta eq 1. In the papers dedicated to the development of this structure, a significant decrease in Ze was shown for medium energies range, beta 0.4-0.5. For high-intensity hadron linacs, this energy range, in which particles are captured to acceleration from the drift tube structure, is of the greatest interest. In this paper, a set of CDS parameters was obtained, which provides a Ze value not lower in the comparison to the proven structures in the medium energy range. By the comparison of the electrodynamic and technological parameters of CDS with these structures, the advantages of its application in multi-section cavities for the up to 1 GeV linacs are shown. The selection of optimal cells manufacturing tolerances, the method of its tuning before brazing and frequency parameters control, and the selection of the method for multipactor discharge suppression are determined. The results of the sketch project of the CDS cavity numerical simulation as a non-uniform coupled system and optimization of the transition part of sections and bridge devices are presented.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA06
About •	Received ※ 22 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 16 October 2021
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MOPSA16	Design and Characteristics of Cryostat for Testing of Low-Beta 325 MHz Half-Wave Resonators	vacuum, 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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TUX01	Status of the HIAF Accelerator Facility in China	ECR, injection, linac, vacuum	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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TUB07	The Conceptual Design of the 7.5 MeV/u Light Ion Injector	rfq, linac, simulation, ion-source	51
	S.M. Polozov, A.E. Aksentyev, M.M. Bulgacheva, O.V. Deryabochkin, M.S. Dmitriyev, V.V. Dmitriyeva, M.V. Dyakonov, V.S. Dyubkov, A.V. Gerasimenko, A.A. Gorchakov, M. Gusarova, M.A. Guzov, E.N. Indiushnii, A.M. Korshunov, K.I. Kozlovskiy, A.S. Krasnov, M.V. Lalayan, Y. Lozeev, T.A. Lozeeva, A.I. Makarov, S.V. Matsievskiy, A.P. Melekhov, O.V. Murygin, R.E. Nemchenko, G.G. Novikov, A.E. Novozhilov, A.S. Panishev, V.N. Pashentsev, A.G. Ponomarenko, A.V. Prokopenko, V.I. Rashchikov, A.V. Samoshin, A.A. Savchik, V.L. Shatokhin, A.E. Shikanov, K.D. Smirnov, G.A. Tsarev, S.A. Tumanov, I.A. Yurin, M.I. Zhigailova MEPhI, Moscow, Russia M.L. Smetanin, A.V. Telnov VNIIEF, Sarov, Russia N.V. Zavyalov RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia
	The new linac for light ion beam injection is under development at MEPhI. Such linac was proposed for acceleration of 7.5 MeV/u ion beam with A/Z=1-3 and current up to 5 mA for proton and 0.4 pmA for light ions. The linac general layout will include two types of ion sources: ECR ion source for proton anf He ions and laser ion source for ions form Li to O. Following the LEBT ions will be bunched and accelerated to the final energy using RFQ section and 14 IH cavities. These IH-cavities will be identical (divided into two groups) and independently phased. All cavities will operate on 81 MHz. Results of the beam dynamics simulations and the cavities design will presented in the report.
	Slides TUB07 [5.210 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUB07
About •	Received ※ 16 September 2021 — Revised ※ 25 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 14 October 2021
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TUPSB44	Design and Simulation of an S-Band RF Photogun for a New Injector of the Accelerator Linac-200 at JINR	gun, electron, laser, linac	322
	Y.A. Samofalova, V.V. Kobets, M.A. Nozdrin, A. Zhemchugov JINR, Dubna, Moscow Region, Russia A.M. Barnyakov BINP SB RAS, Novosibirsk, Russia
	A new 2.856 GHz S-band RF photogun for the generation of ultrashort electron beams at the LINAC-200 accelerator at JINR is simulated. The beam parameters at the photogun output are determined to meet the requirements of the LINAC-200 injection. The general design of the photogun is presented. The electrodynamic parameters are determined and the accelerating field distribution is calculated. The particle dynamics is simulated and analyzed to obtain the required beam properties.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB44
About •	Received ※ 29 September 2021 — Revised ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 17 October 2021
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WEPSC01	Unit for Matching a Driving Waveguide With a Cavity	GUI, ECR, coupling, Windows	340
	V.V. Paramonov RAS/INR, Moscow, Russia
	To match the driving waveguide, usually operating in the fundamental TE10 wave, with the accelerating structure, a device is required that performs the function of a wave-type transformer. In the microwave region, transforming devices with matching windows are usually used, the field distribution in which can also be described as TE-type. At the ends of the window from the side of the structure, regions with an increased density of Surface Currents (SC) inevitably arise, leading to an increase in the surface temperature in a place that is difficult to access for cooling. There are various solutions for matching windows, in order to reduce the maximum SC from the side of the structure , briefly mentioned in the report. A solution based on the dispersion properties of the waveguide and providing a significant additional decrease in the SC density is considered. This solution can be implemented in devices for S and lower frequency ranges.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC01
About •	Received ※ 06 September 2021 — Revised ※ 20 September 2021 — Accepted ※ 24 September 2021 — Issued ※ 22 October 2021
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WEPSC03	Multipactor Discharge in Short 5-Gap 80 MHz IH Structures	multipactoring, electron, impedance, simulation	343
	M.M. Bulgacheva, M. Gusarova, M.V. Lalayan MEPhI, Moscow, Russia
	The results of numerical simulations of multipacting discharge in accelerating Interdigital H-type (IH) cavities are presented in this paper. Optimal design parameters were selected to reduce the number of multipactor electrons. The localization of multipactor trajectories in the short 5-gap 80 MHz IH cavities at various levels of accelerating voltage is considered.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC03
About •	Received ※ 26 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 17 October 2021
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WEPSC05	Modeling of the Energy Compression System SLED for the LINAC-200 Accelerator	linac, electron, klystron, coupling	349
	K. Yunenko, M. Gostkin, V.V. Kobets, A. Zhemchugov JINR, Dubna, Moscow Region, Russia
	This paper is devoted to the research of the possibility of increasing the output energy of an electron beam at the LINAC-200 linear accelerator by using the SLED energy compression system with constant parameters of the storage cavities. In order to select the necessary parameters and characteristics for the successful creation of this system on the acceleratorm, the SLED system structure simulation and the characteristics of cylindrical hollow resonators calculation were conducted using the CST MICROWAVE STUDIO program.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC05
About •	Received ※ 18 September 2021 — Revised ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 16 October 2021
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WEPSC07	Medium Energy Ions Transport Channel for a Pulsed Linear Accelerator	MEBT, simulation, rfq, light-ion	355
	V.S. Dyubkov MEPhI, Moscow, Russia
	For a transportation and matching proton and light ion beams (the maximal value A/Z is about 3.2) between RFQ and groups of IH-cavities it is suggested medium energy ions transfer line. That line should provide 100% beam transmission under negligible beam envelope increase and small longitudinal beam size growth during particle transport. MEBT consists of two parts. One of them provides ion transfer with energy 820 keV/u and the second one provides ion transfer with energy 2.46 MeV/u.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC07
About •	Received ※ 07 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 13 October 2021
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WEPSC10	Optimization of Accelerators Vacuum Structures Pumping	vacuum, rfq, simulation, beam-transport	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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WEPSC12	Preliminary Calculation of the Power Coupler for the SYLA Storage Ring RF Cavity	coupling, storage-ring, operation, synchrotron	364
	S.V. Matsievskiy, M. Gusarova, M.V. Lalayan, Ya.V. Shashkov MEPhI, Moscow, Russia
	Several new accelerator facilities will be built in Russia in the next few years. One of those facilities is a 6 GeV storage ring light source, the Ultimate Source of Synchrotron Radiation to be built in Protvino, near Moscow. This paper considers storage ring RF cavity power coupler design issues and provides preliminary calculations of the device.
	Poster WEPSC12 [0.741 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC12
About •	Received ※ 08 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 22 October 2021
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WEPSC13	Accelerating Cavities with HOM Damping for USSR-4 Storage Ring	HOM, GUI, impedance, damping	367
	Ya.V. Shashkov, M. Gusarova, M.V. Lalayan, N.Yu. Samarokov MEPhI, Moscow, Russia M. Gusarova NRC, Moscow, Russia
	Preliminary results on accelerating cavities for USSR-4 facility (also known as SYLA - SYnchrotron and free-electron LAser) project are presented. This facility is under development by collaboration hosted by National Research Center "Kurchatov Institute". SYLA is synchro-tron radiation facility based on injector linac and 6 GeV storage ring. Beam energy loss in storage ring is to be compensated by several modified pillbox cavities. Cavity geometry features, its operation frequency choice and induced HOM parameters are discussed. HOM damping technique using corrugated cylindrical waveguides were studied. Longitudinal impedance values of HOM are presented for initial accelerating cavity and structure with waveguides.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC13
About •	Received ※ 18 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 21 October 2021
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WEPSC14	Booster RF System First Beam Tests	booster, controls, acceleration, injection	370
	A.Yu. Grebentsov, O.I. Brovko, A.V. Butenko, V.A. Gerklotts, A.M. Malyshev, V.D. Petrov, O.V. Prozorov, E. Syresin, A.A. Volodin JINR, Dubna, Moscow Region, Russia A.M. Batrakov, S.A. Krutikhin, G.Y. Kurkin, V.M. Petrov, A.M. Pilan, E. Rotov, A.G. Tribendis BINP SB RAS, Novosibirsk, Russia G.A. Fatkin NSU, Novosibirsk, Russia
	The project NICA is being constructed in JINR, to provide collisions of heavy ion beams in the energy range from 1 to 4.5 GeV/u at the luminosity level of 1·1027 cm^-2·s⁻¹. A key element in the collider injection chain is the Booster a cycling accelerator of ions 197Au³¹⁺. The injection energy of particles is 3.2 MeV/u, extraction energy is 600MeV/u. Two Booster RF stations provide 10 kV of acceleration voltage. The frequency range from 587 kHz to 2526 kHz at the operation of the stations in the injector chain. The RF stations were fabricated in the Budker Institute of Nuclear Physics. The main design features and parameters of the first beam tests of the Booster RF system are discussed in this paper.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC14
About •	Received ※ 17 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 16 October 2021
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WEPSC42	RF Cavity Based Charge Detector for a Low Charge Ultra Sort Singe Electron Bunch Measurement	detector, electron, experiment, linac	423
	V. Gubin Institute of Laser Physics, SB RAS, Novosibirsk, Russia A.M. Barnyakov, S.L. Samoylov, D.P. Sukhanov BINP SB RAS, Novosibirsk, Russia
	Nowadays project of laser-driven Compton light source started in ILP SB RAS in collaboration with BINP SB RAS. It is expected production of 1-10 pC electron beams sub-ps time range duration with energies up to 100-150 MeV as result of the first stage of the project. It is necessary to have the non-destructive charge detector for on line measurements during experiments. We proposed detector based on reentrant RF resonator technology. Singe circular cylinder geometry of measuring RF cavity is insensitive to electron beam position and size as well as time structure of bunch (on the assumption of sufficiently short bunch). Base data of cavity are close to acceleration section elements of VEPP-5 linac. Prototype of detector successfully tested at the VEPP-5 electron linac. Measured charge of single bunch reaches down to 1 pC and less. This paper presents the results of development and testing of diagnostics
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC42
About •	Received ※ 21 September 2021 — Revised ※ 06 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 19 October 2021
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WEPSC50	Enhancement of Transverse Beam Phase Space Analysis by Tomography Method at INR Linac	emittance, linac, simulation, quadrupole	433
	A.I. Titov, S. Bragin, S.A. Gavrilov, O. Volodkevich RAS/INR, Moscow, Russia S.A. Gavrilov, A.I. Titov MIPT, Dolgoprudniy, Moscow Region, Russia
	The investigation of transverse beam phase space parameters behavior along the accelerator is important for proper accelerator tuning. At INR RAS linac transverse emittance and Twiss parameters are reconstructed from beam profile measurements with quadrupole scan technique at several measurement points along the accelerator. Profile treatment is performed with ordinary transverse profiles method and tomographic reconstruction method. Various experimental data is presented. The comparison of the results obtained by the two methods is done. Features of beam dynamics simulation based on the data from these methods are discussed.
	Poster WEPSC50 [6.621 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC50
About •	Received ※ 17 September 2021 — Revised ※ 21 September 2021 — Accepted ※ 23 September 2021 — Issued ※ 22 October 2021
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THA01	Status of the SC HWR Cavities Production for NICA Project	linac, light-ion, proton, niobium	85
	M. Gusarova, M.V. Lalayan, S.V. Matsievskiy, R.E. Nemchenko, S.M. Polozov, V.L. Shatokhin, N.P. Sobenin MEPhI, Moscow, Russia A.V. Butenko, M.V. Lalayan, E. Syresin, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia D. Bychanok, S.A. Maksimenko INP BSU, Minsk, Belarus V.S. Petrakovsky, I.L. Pobol, A.I. Pokrovsky, A. Shvedov, S.V. Yurevich, V.G. Zaleski Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus G.V. Trubnikov JINR/VBLHEP, Dubna, Moscow region, Russia
	Since 2015 the superconducting (SC) linac-injector development for Nuclotron NICA (JINR, Dubna, Russia) is carried out by the collaboration of JINR, NRNU MEPhI, INP BSU, PTI NASB. This new SC linac is to accelerate protons up to 20 MeV and light ions to 7.5 MeV/u with possible energy upgrade up to 50 MeV for proton beam. This paper reports the current status of the development and manufacturing of superconducting accelerating cavities for a new linear accelerator of the injection complex of the Nuclotron-NICA project.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-THA01
About •	Received ※ 26 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 24 October 2021
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Paper

Title

Other Keywords

Page

MOPSA02

Experimental Tests of CW Resonance Accelerator With 7.5 MeV High Intensity Electron Beam

electron, experiment, injection, resonance

132

L.E. Polyakov, Ya.V. Bodryashkin, M.A. Guzov, I.I. Konishev, N.N. Kurapov, V.V. Kuznetsov, I.A. Mashin, V.R. Nikolaev, A.M. Opekunov, G. Pospelov, A.N. Shein, I.V. Shorikov, N.V. Zavyalov, I.V. Zhukov
RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia
S.A. Putevskoy, M.L. Smetanin, A.V. Telnov
VNIIEF, Sarov, Russia

CW resonance accelerator with high average power electron beam is developed at RFNC-VNIIEF. Electron energy range is varied from 1.5 to 7.5 MeV and average beam current is up to 40 mA. Electrons obtain the required energy by several passing of coaxial half-wave accelerating cavity. In this paper we present the results of electron beam dynamics simulation during its acceleration and transportation. The operating parameters of RF system, beam optics and bending magnets are determined. These parameters permit to obtain output beam with minimal current losses on each accelerating stage. As a result of carried out tests we obtained 7.5 MeV electron beam after five passes of accelerating cavity. The electron energy spectrum, average beam current, transverse beam dimensions were determined on each accelerating stage. Common beam current loss is under 10 %.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA02

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Received ※ 25 September 2021 — Revised ※ 26 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 21 October 2021

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MOPSA03

Calculations of Ion Dynamics and Elecrodynamics Characteristics of 800 KeV/nucleon RFQ

emittance, Windows, rfq, coupling

135

M.A. Guzov, A.M. Opekunov, L.E. Polyakov, N.V. Zavyalov
RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia
M.A. Guzov, E.N. Indiushnii, Y. Lozeev, A.I. Makarov, S.M. Polozov
MEPhI, Moscow, Russia
M.L. Smetanin, A.V. Telnov
VNIIEF, Sarov, Russia

Accelerating structure with radio-frequency quadrupole focusing (RFQ) was observed in this research. The RFQ is aimed to bunch up, accelerate and focus 1 MeV/nucleon ions with A/Z from 1 to 3.2 (A - mass number of ion, Z - ion charge). The chemical elements from H⁺ to O5+ fill up this particle types range. The protons current is 2 mA and ion current is 1 mA. In this paper charged particle dynamics calculations, which essential for next electrodynamic cavity modeling, were performed. The electrodynamic model of 4-vane RFQ cavity with windows of magnetic connection was created. The dependence between frequency and cavity geometrics was defined. Topology of magnetic windows, which aimed to have the maximum mod separations, was determined. Different types of tanks were considered and corresponding electromagnetic characteristics were calculated. Tuning elements (plungers and spacers) influence on cavity was modeled. As a result optimized model of accelerating structure was realized.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA03

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Received ※ 20 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 18 October 2021

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MOPSA04

The Tuning of RF Parameters of 40 MHz RFQ

rfq, linac, coupling, Windows

139

A. Sitnikov, G. Kropachev, T. Kulevoy, D.N. Selesnev, A.I. Semennikov
ITEP, Moscow, Russia

The new linac for A/Z = 8, output energy 4 MeV/u and 10 mA current is under development at NRC "Kurchatov Institute" - ITEP. The linac consists of Radio-Frequency Quadrupole (RFQ) and two sections of Drift Tube Linac (DTL). The 40 MHz 11 meters long RFQ is based on a 4-vane structure with magnetic coupling windows. The paper presents results of tuning radio-frequency (RF) RFQ parameters.

Poster MOPSA04 [1.243 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA04

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Received ※ 24 September 2021 — Revised ※ 25 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 16 October 2021

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MOPSA06

Parameters of the Normal Conducting Accelerating Structure for the Up to 1 GeV Hadron Linacs

linac, coupling, multipactoring, hadron

142

I.V. Rybakov, A. Feschenko, L.V. Kravchuk, V.V. Paramonov, V.L. Serov
RAS/INR, Moscow, Russia

Compensated bi-periodic accelerating structure Cut Disk Structure (CDS) was developed for accelerating particle beams at beta eq 1. In the papers dedicated to the development of this structure, a significant decrease in Ze was shown for medium energies range, beta 0.4-0.5. For high-intensity hadron linacs, this energy range, in which particles are captured to acceleration from the drift tube structure, is of the greatest interest. In this paper, a set of CDS parameters was obtained, which provides a Ze value not lower in the comparison to the proven structures in the medium energy range. By the comparison of the electrodynamic and technological parameters of CDS with these structures, the advantages of its application in multi-section cavities for the up to 1 GeV linacs are shown. The selection of optimal cells manufacturing tolerances, the method of its tuning before brazing and frequency parameters control, and the selection of the method for multipactor discharge suppression are determined. The results of the sketch project of the CDS cavity numerical simulation as a non-uniform coupled system and optimization of the transition part of sections and bridge devices are presented.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA06

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Received ※ 22 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 16 October 2021

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MOPSA16

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

vacuum, 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

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

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TUX01

Status of the HIAF Accelerator Facility in China

ECR, injection, linac, vacuum

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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TUB07

The Conceptual Design of the 7.5 MeV/u Light Ion Injector

rfq, linac, simulation, ion-source

51

S.M. Polozov, A.E. Aksentyev, M.M. Bulgacheva, O.V. Deryabochkin, M.S. Dmitriyev, V.V. Dmitriyeva, M.V. Dyakonov, V.S. Dyubkov, A.V. Gerasimenko, A.A. Gorchakov, M. Gusarova, M.A. Guzov, E.N. Indiushnii, A.M. Korshunov, K.I. Kozlovskiy, A.S. Krasnov, M.V. Lalayan, Y. Lozeev, T.A. Lozeeva, A.I. Makarov, S.V. Matsievskiy, A.P. Melekhov, O.V. Murygin, R.E. Nemchenko, G.G. Novikov, A.E. Novozhilov, A.S. Panishev, V.N. Pashentsev, A.G. Ponomarenko, A.V. Prokopenko, V.I. Rashchikov, A.V. Samoshin, A.A. Savchik, V.L. Shatokhin, A.E. Shikanov, K.D. Smirnov, G.A. Tsarev, S.A. Tumanov, I.A. Yurin, M.I. Zhigailova
MEPhI, Moscow, Russia
M.L. Smetanin, A.V. Telnov
VNIIEF, Sarov, Russia
N.V. Zavyalov
RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia

The new linac for light ion beam injection is under development at MEPhI. Such linac was proposed for acceleration of 7.5 MeV/u ion beam with A/Z=1-3 and current up to 5 mA for proton and 0.4 pmA for light ions. The linac general layout will include two types of ion sources: ECR ion source for proton anf He ions and laser ion source for ions form Li to O. Following the LEBT ions will be bunched and accelerated to the final energy using RFQ section and 14 IH cavities. These IH-cavities will be identical (divided into two groups) and independently phased. All cavities will operate on 81 MHz. Results of the beam dynamics simulations and the cavities design will presented in the report.

Slides TUB07 [5.210 MB]

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUB07

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Received ※ 16 September 2021 — Revised ※ 25 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 14 October 2021

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TUPSB44

Design and Simulation of an S-Band RF Photogun for a New Injector of the Accelerator Linac-200 at JINR

gun, electron, laser, linac

322

Y.A. Samofalova, V.V. Kobets, M.A. Nozdrin, A. Zhemchugov
JINR, Dubna, Moscow Region, Russia
A.M. Barnyakov
BINP SB RAS, Novosibirsk, Russia

A new 2.856 GHz S-band RF photogun for the generation of ultrashort electron beams at the LINAC-200 accelerator at JINR is simulated. The beam parameters at the photogun output are determined to meet the requirements of the LINAC-200 injection. The general design of the photogun is presented. The electrodynamic parameters are determined and the accelerating field distribution is calculated. The particle dynamics is simulated and analyzed to obtain the required beam properties.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB44

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Received ※ 29 September 2021 — Revised ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 17 October 2021

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WEPSC01

Unit for Matching a Driving Waveguide With a Cavity

GUI, ECR, coupling, Windows

340

V.V. Paramonov
RAS/INR, Moscow, Russia

To match the driving waveguide, usually operating in the fundamental TE10 wave, with the accelerating structure, a device is required that performs the function of a wave-type transformer. In the microwave region, transforming devices with matching windows are usually used, the field distribution in which can also be described as TE-type. At the ends of the window from the side of the structure, regions with an increased density of Surface Currents (SC) inevitably arise, leading to an increase in the surface temperature in a place that is difficult to access for cooling. There are various solutions for matching windows, in order to reduce the maximum SC from the side of the structure , briefly mentioned in the report. A solution based on the dispersion properties of the waveguide and providing a significant additional decrease in the SC density is considered. This solution can be implemented in devices for S and lower frequency ranges.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC01

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Received ※ 06 September 2021 — Revised ※ 20 September 2021 — Accepted ※ 24 September 2021 — Issued ※ 22 October 2021

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WEPSC03

Multipactor Discharge in Short 5-Gap 80 MHz IH Structures

multipactoring, electron, impedance, simulation

343

M.M. Bulgacheva, M. Gusarova, M.V. Lalayan
MEPhI, Moscow, Russia

The results of numerical simulations of multipacting discharge in accelerating Interdigital H-type (IH) cavities are presented in this paper. Optimal design parameters were selected to reduce the number of multipactor electrons. The localization of multipactor trajectories in the short 5-gap 80 MHz IH cavities at various levels of accelerating voltage is considered.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC03

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Received ※ 26 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 17 October 2021

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WEPSC05

Modeling of the Energy Compression System SLED for the LINAC-200 Accelerator

linac, electron, klystron, coupling

349

K. Yunenko, M. Gostkin, V.V. Kobets, A. Zhemchugov
JINR, Dubna, Moscow Region, Russia

This paper is devoted to the research of the possibility of increasing the output energy of an electron beam at the LINAC-200 linear accelerator by using the SLED energy compression system with constant parameters of the storage cavities. In order to select the necessary parameters and characteristics for the successful creation of this system on the acceleratorm, the SLED system structure simulation and the characteristics of cylindrical hollow resonators calculation were conducted using the CST MICROWAVE STUDIO program.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC05

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Received ※ 18 September 2021 — Revised ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 16 October 2021

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WEPSC07

Medium Energy Ions Transport Channel for a Pulsed Linear Accelerator

MEBT, simulation, rfq, light-ion

355

V.S. Dyubkov
MEPhI, Moscow, Russia

For a transportation and matching proton and light ion beams (the maximal value A/Z is about 3.2) between RFQ and groups of IH-cavities it is suggested medium energy ions transfer line. That line should provide 100% beam transmission under negligible beam envelope increase and small longitudinal beam size growth during particle transport. MEBT consists of two parts. One of them provides ion transfer with energy 820 keV/u and the second one provides ion transfer with energy 2.46 MeV/u.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC07

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Received ※ 07 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 13 October 2021

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WEPSC10

Optimization of Accelerators Vacuum Structures Pumping

vacuum, rfq, simulation, beam-transport

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

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

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WEPSC12

Preliminary Calculation of the Power Coupler for the SYLA Storage Ring RF Cavity

coupling, storage-ring, operation, synchrotron

364

S.V. Matsievskiy, M. Gusarova, M.V. Lalayan, Ya.V. Shashkov
MEPhI, Moscow, Russia

Several new accelerator facilities will be built in Russia in the next few years. One of those facilities is a 6 GeV storage ring light source, the Ultimate Source of Synchrotron Radiation to be built in Protvino, near Moscow. This paper considers storage ring RF cavity power coupler design issues and provides preliminary calculations of the device.

Poster WEPSC12 [0.741 MB]

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC12

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Received ※ 08 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 22 October 2021

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WEPSC13

Accelerating Cavities with HOM Damping for USSR-4 Storage Ring

HOM, GUI, impedance, damping

367

Ya.V. Shashkov, M. Gusarova, M.V. Lalayan, N.Yu. Samarokov
MEPhI, Moscow, Russia
M. Gusarova
NRC, Moscow, Russia

Preliminary results on accelerating cavities for USSR-4 facility (also known as SYLA - SYnchrotron and free-electron LAser) project are presented. This facility is under development by collaboration hosted by National Research Center "Kurchatov Institute". SYLA is synchro-tron radiation facility based on injector linac and 6 GeV storage ring. Beam energy loss in storage ring is to be compensated by several modified pillbox cavities. Cavity geometry features, its operation frequency choice and induced HOM parameters are discussed. HOM damping technique using corrugated cylindrical waveguides were studied. Longitudinal impedance values of HOM are presented for initial accelerating cavity and structure with waveguides.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC13

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Received ※ 18 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 21 October 2021

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WEPSC14

Booster RF System First Beam Tests

booster, controls, acceleration, injection

370

A.Yu. Grebentsov, O.I. Brovko, A.V. Butenko, V.A. Gerklotts, A.M. Malyshev, V.D. Petrov, O.V. Prozorov, E. Syresin, A.A. Volodin
JINR, Dubna, Moscow Region, Russia
A.M. Batrakov, S.A. Krutikhin, G.Y. Kurkin, V.M. Petrov, A.M. Pilan, E. Rotov, A.G. Tribendis
BINP SB RAS, Novosibirsk, Russia
G.A. Fatkin
NSU, Novosibirsk, Russia

The project NICA is being constructed in JINR, to provide collisions of heavy ion beams in the energy range from 1 to 4.5 GeV/u at the luminosity level of 1·1027 cm^-2·s⁻¹. A key element in the collider injection chain is the Booster a cycling accelerator of ions 197Au³¹⁺. The injection energy of particles is 3.2 MeV/u, extraction energy is 600MeV/u. Two Booster RF stations provide 10 kV of acceleration voltage. The frequency range from 587 kHz to 2526 kHz at the operation of the stations in the injector chain. The RF stations were fabricated in the Budker Institute of Nuclear Physics. The main design features and parameters of the first beam tests of the Booster RF system are discussed in this paper.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC14

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Received ※ 17 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 16 October 2021

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WEPSC42

RF Cavity Based Charge Detector for a Low Charge Ultra Sort Singe Electron Bunch Measurement

detector, electron, experiment, linac

423

V. Gubin
Institute of Laser Physics, SB RAS, Novosibirsk, Russia
A.M. Barnyakov, S.L. Samoylov, D.P. Sukhanov
BINP SB RAS, Novosibirsk, Russia

Nowadays project of laser-driven Compton light source started in ILP SB RAS in collaboration with BINP SB RAS. It is expected production of 1-10 pC electron beams sub-ps time range duration with energies up to 100-150 MeV as result of the first stage of the project. It is necessary to have the non-destructive charge detector for on line measurements during experiments. We proposed detector based on reentrant RF resonator technology. Singe circular cylinder geometry of measuring RF cavity is insensitive to electron beam position and size as well as time structure of bunch (on the assumption of sufficiently short bunch). Base data of cavity are close to acceleration section elements of VEPP-5 linac. Prototype of detector successfully tested at the VEPP-5 electron linac. Measured charge of single bunch reaches down to 1 pC and less. This paper presents the results of development and testing of diagnostics

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC42

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Received ※ 21 September 2021 — Revised ※ 06 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 19 October 2021

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WEPSC50

Enhancement of Transverse Beam Phase Space Analysis by Tomography Method at INR Linac

emittance, linac, simulation, quadrupole

433

A.I. Titov, S. Bragin, S.A. Gavrilov, O. Volodkevich
RAS/INR, Moscow, Russia
S.A. Gavrilov, A.I. Titov
MIPT, Dolgoprudniy, Moscow Region, Russia

The investigation of transverse beam phase space parameters behavior along the accelerator is important for proper accelerator tuning. At INR RAS linac transverse emittance and Twiss parameters are reconstructed from beam profile measurements with quadrupole scan technique at several measurement points along the accelerator. Profile treatment is performed with ordinary transverse profiles method and tomographic reconstruction method. Various experimental data is presented. The comparison of the results obtained by the two methods is done. Features of beam dynamics simulation based on the data from these methods are discussed.

Poster WEPSC50 [6.621 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC50

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Received ※ 17 September 2021 — Revised ※ 21 September 2021 — Accepted ※ 23 September 2021 — Issued ※ 22 October 2021

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THA01

Status of the SC HWR Cavities Production for NICA Project

linac, light-ion, proton, niobium

85

M. Gusarova, M.V. Lalayan, S.V. Matsievskiy, R.E. Nemchenko, S.M. Polozov, V.L. Shatokhin, N.P. Sobenin
MEPhI, Moscow, Russia
A.V. Butenko, M.V. Lalayan, E. Syresin, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia
D. Bychanok, S.A. Maksimenko
INP BSU, Minsk, Belarus
V.S. Petrakovsky, I.L. Pobol, A.I. Pokrovsky, A. Shvedov, S.V. Yurevich, V.G. Zaleski
Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus
G.V. Trubnikov
JINR/VBLHEP, Dubna, Moscow region, Russia

Since 2015 the superconducting (SC) linac-injector development for Nuclotron NICA (JINR, Dubna, Russia) is carried out by the collaboration of JINR, NRNU MEPhI, INP BSU, PTI NASB. This new SC linac is to accelerate protons up to 20 MeV and light ions to 7.5 MeV/u with possible energy upgrade up to 50 MeV for proton beam. This paper reports the current status of the development and manufacturing of superconducting accelerating cavities for a new linear accelerator of the injection complex of the Nuclotron-NICA project.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-THA01

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Received ※ 26 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 24 October 2021

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