RuPAC2021 - List of Authors (Polozov, S.M.)

Paper	Title	Page
MOPSA03	Calculations of Ion Dynamics and Elecrodynamics Characteristics of 800 KeV/nucleon RFQ	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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MOPSA07	200 MeV Linear Electron Accelerator - Pre-Injector for a New Kurchatov Synchrotron Radiation Source	145
	I.A. Ashanin, S.M. Polozov, A.I. Pronikov, V.I. Rashchikov MEPhI, Moscow, Russia I.A. Ashanin, V. Korchuganov, S.M. Polozov, A.I. Pronikov, V.I. Rashchikov, V.A. Ushakov NRC, Moscow, Russia
	New linear electron accelerator (linac) with an energy of about 200 MeV (or 300 MeV in a high-energy version) is being proposed for injection into the booster synchrotron, which is being developed for the reconstruction of the SIBERIA-2 accelerator complex with the aim of upgrade to 3rd generation source at the NRC «Kurchatov Institute». A modernized linac and its specific elements layout will described in the report. The modeling of accelerating structure and optimization of electrodynamics characteristics and fields distribution and geometric in order to reduce the beam spectrum at the output of the linac was done. A step-by-step front-to-end beam dynamics simulation results will discuss.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA07
About •	Received ※ 29 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 12 October 2021
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MOPSA08	Beam Dynamics Simulation in a Linear Electron Accelerator - Injector for the 4th Generation Specialized Synchrotron Radiation Source USSR	149
	I.A. Ashanin, Yu.D. Kliuchevskaia, S.M. Polozov, A.I. Pronikov MEPhI, Moscow, Russia I.A. Ashanin, S.M. Polozov, A.I. Pronikov NRC, Moscow, Russia
	USSR project (Ultimate Source of Synchrotron Radiation, 4th generation synchrotron light source) is being developed in the NRC «Kurchatov Institute». This Light Source will include both storage ring and soft FEL (Free Electron Laser) and one linac with an energyof 6 GeV, which is planned to be used both for beam injection into storage ring (top-up injection) and as a high-brightness bunch driver for FEL. It is suggested to use two front-ends in this linac: RF-gun with thermionic cathode with adiabatic buncher for injection into storage ring and RF-gun with photocathode will use to generate a bunch train for FEL. The purpose of this work was to development a general layout of the top-up linac with the aim of minimize of the beam energy spread and transverse emittance at the exit and analysis the front-to-end beam dynamics in this linear accelerator.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA08
About •	Received ※ 29 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 09 October 2021
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MOPSA16	Design and Characteristics of Cryostat for Testing of Low-Beta 325 MHz Half-Wave Resonators	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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MOPSA42	Compact S-Band Accelerating Structure for Medical Applications	186
	M.V. Lalayan, A. Batov, M. Gusarova, S.M. Polozov, R.A. Zbruev MEPhI, Moscow, Russia
	This paper describes electromagnetic design results for the compact 6.3 MeV electron linac for the radiation therapy facility. Linac is based on S-band biperiodic accelerating structure with inner coupling cells with an increased coupling coefficient.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA42
About •	Received ※ 01 October 2021 — Revised ※ 02 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 11 October 2021
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MOPSA43	C-Band Linear Accelerator Structure for Radiotherapy
	D.A. Pavlov NRNU MEPHI, Moscow, Russia S.M. Polozov, S.M. Polozov MEPhI, Moscow, Russia
	Development of a linear electron accelerator energy of 6 MeV operating on 5712 MHz is discussed for radiotherapy. The therapy complex will has the toroidal configuration. The main purpose of work is to design the accelerating structure with length less than 50 cm. Results of beam dynamics simulation will presented in the report. Simulations are performed using BEAMDULAC code to achieve the gaussian distribution of the energy spectrum of the 6 MeV electron beam. First results of the C-band accelerating structure electrodynamics simulations will also presented.
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TUB07	The Conceptual Design of the 7.5 MeV/u Light Ion Injector	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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TUC02	Concept of a New Kurchatov Synchrotron Radiation Source
	V. Korchuganov, Ye. Fomin, M.V. Kovalchuk, A.S. Smygacheva, V.A. Ushakov, A.G. Valentinov NRC, Moscow, Russia S.M. Polozov MEPhI, Moscow, Russia
	The Kurchatov source of SR has started a project for an upgrade of the accelerator complex based on the existing infrastructure. Instead of the operating 2.5 GeV SR source with a natural emittance of 98 nm-rad, a new 2.5 GeV SR source with a natural emittance less than 3 nm-rad will be built. To ensure its "continuous" operation, a new injection complex (top-up energy injection scheme) - 0.2-2.5 GeV booster synchrotron and 200 MeV linac with transfer lines will be installed. The report gives the concept of the new complex. Also, special attention is paid to the main storage ring operation with insertion devices and problems of electron beam injection in the storage ring at the multi-bunch and single-bunch modes.
	Slides TUC02 [5.979 MB]
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TUZ01	Accelerator Physics and Education: MEPhI Experience and Problems
	S.M. Polozov, V.V. Dmitriyeva MEPhI, Moscow, Russia
	Today we have many new interesting accelerators projects in Russia. But the new specialists training and employment is the base problem for the success of new acceerator complexes construction and exploatation. The MEPhI experience of accelerator researchers and engineers training and current successes and problems will presented to start the discussion.
	Slides TUZ01 [3.319 MB]
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TUPSB25	Storage Ring Design and Beam Instabilities Investigation for MEPhI’s Photon Source	277
	V.S. Dyubkov, S.M. Polozov MEPhI, Moscow, Russia
	Funding: Work supported by Russian Foundation for Basic Research, grant no. 19-29-12036 There is a design of a compact photon source based on inverse Compton scattering at NRNU MEPhI. Updated synchrotron lattice, electron dynamics simulation and beam instabilities studies are presented.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB25
About •	Received ※ 30 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 23 October 2021
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TUPSB42	Investigation of a Laser Ion Source with Magnetic Contraction of a Plasma Flow
	E.D. Vovchenko, K.I. Kozlovskii, S.M. Polozov, A.E. Shikanov MEPhI, Moscow, Russia
	The formation of ion fluxes in a laser-plasma source using azimuthally symmetric magnetic fields is investigated. Because of computer modeling and physical experiments, the possibility of generating ion packets suitable for their effective capture in a linear resonant accelerator with high frequency focusing is shown.
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TUPSB43	Optimization of the RF-Gun With Photocathode at Operating Frequency 2800 MHz for the New Injection Linac for USSR Project	319
	Yu.D. Kliuchevskaia, S.M. Polozov MEPhI, Moscow, Russia S.M. Polozov NRC, Moscow, Russia
	The beam dynamics analysis of the RF-gun with photocathode for Russian 4th generation light source Ultimate Source of Synchrotron Radiation (USSR-4) was done to chose the optimal length of the section and cell’s number and also to define optimal accelerating gradient and injection phase. The simulation of electrodynamics parameters and RF field distribution in the RF-gun based on 3.5-, 5.5- and 7.5-cell pi-mode standing wave accelerating structure at operating frequency 2800 MHz was done. The influence of the beam loading effect on the field amplitude and beam dynamics was the main purpose of study also. The beam dynamics simulation results will present in the report and optimal RF-gun parameters will discuss.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB43
About •	Received ※ 15 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 23 October 2021
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WEPSC08	Vacuum Condition Simulations for Vacuum Chambers of Synchrotron Radiation Source	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	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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WEPSC11	Optimization of the RFQ Electrode Construction for Multipactor Discharge Prevention
	Y. Lozeev, M. Gusarova, M.A. Guzov, E.N. Indiushnii, A.I. Makarov, S.M. Polozov MEPhI, Moscow, Russia M.A. Guzov RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia
	In this paper the study of an opportunity of multipactor discharge appearance in the four-vane RFQ structure was performed. This structure has several regions with thin gaps that have a risk of multipactor discharges. First region is the area close to frequency tuners and the second one is the bottom part of the electrodes. Further, an optimization of construction was proposed to solve this issue.
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WEPSC21	Light Ion Accelerator Magnets	390
	I.A. Yurin, M.S. Dmitriyev, E.N. Indiushnii, S.M. Polozov MEPhI, Moscow, Russia
	At the moment, the National Research Nuclear University (MEPhI) is developing an injector for an accelerator of light ions with an energy of 7.5 MeV / nucleon. The injector uses several tens of quadrupole magnets with a magnetic field gradient of 6-18 T / m and several units of dipole magnets. Key requirements for quadrupole magnets include large aperture, compact transverse dimensions, uniform shape and design, ease of fabrication from a manufacturing standpoint, field accuracy within 0.1%, and low power consumption. This article will describe the requirements, simulation results, and preliminary designs for quadrupole and dipole magnets.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC21
About •	Received ※ 21 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 15 October 2021
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THA01	Status of the SC HWR Cavities Production for NICA Project	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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THC03	Numerical Simulations of Space Charge Dominated Beam Dynamics in Experimentally Optimized PITZ RF Photogun	89
	V.I. Rashchikov, S.M. Polozov MEPhI, Moscow, Russia
	Funding: The reported study was partly funded by RFBR, project number 19-29-12036 Discrepancies between experimental data and comput-er simulation results of picosecond highly charged beam photoemission are discussed. New space charge limited emission numerical model with positively charged ions arising in the cathode region and dynamically changing during the emission is presented. Estimates on the time characteristics of the charge migrating process in the semiconductor region are given. The numerical results are compared with the results of other numerical models and with experimental observations at the Photo Injector Test facility at DESY in Zeuthen (PITZ)
	Slides THC03 [1.292 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-THC03
About •	Received ※ 21 September 2021 — Accepted ※ 23 September 2021 — Issued ※ 17 October 2021
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Paper

Title

Page

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

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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MOPSA07

200 MeV Linear Electron Accelerator - Pre-Injector for a New Kurchatov Synchrotron Radiation Source

145

I.A. Ashanin, S.M. Polozov, A.I. Pronikov, V.I. Rashchikov
MEPhI, Moscow, Russia
I.A. Ashanin, V. Korchuganov, S.M. Polozov, A.I. Pronikov, V.I. Rashchikov, V.A. Ushakov
NRC, Moscow, Russia

New linear electron accelerator (linac) with an energy of about 200 MeV (or 300 MeV in a high-energy version) is being proposed for injection into the booster synchrotron, which is being developed for the reconstruction of the SIBERIA-2 accelerator complex with the aim of upgrade to 3rd generation source at the NRC «Kurchatov Institute». A modernized linac and its specific elements layout will described in the report. The modeling of accelerating structure and optimization of electrodynamics characteristics and fields distribution and geometric in order to reduce the beam spectrum at the output of the linac was done. A step-by-step front-to-end beam dynamics simulation results will discuss.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA07

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Received ※ 29 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 12 October 2021

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MOPSA08

Beam Dynamics Simulation in a Linear Electron Accelerator - Injector for the 4th Generation Specialized Synchrotron Radiation Source USSR

149

I.A. Ashanin, Yu.D. Kliuchevskaia, S.M. Polozov, A.I. Pronikov
MEPhI, Moscow, Russia
I.A. Ashanin, S.M. Polozov, A.I. Pronikov
NRC, Moscow, Russia

USSR project (Ultimate Source of Synchrotron Radiation, 4th generation synchrotron light source) is being developed in the NRC «Kurchatov Institute». This Light Source will include both storage ring and soft FEL (Free Electron Laser) and one linac with an energyof 6 GeV, which is planned to be used both for beam injection into storage ring (top-up injection) and as a high-brightness bunch driver for FEL. It is suggested to use two front-ends in this linac: RF-gun with thermionic cathode with adiabatic buncher for injection into storage ring and RF-gun with photocathode will use to generate a bunch train for FEL. The purpose of this work was to development a general layout of the top-up linac with the aim of minimize of the beam energy spread and transverse emittance at the exit and analysis the front-to-end beam dynamics in this linear accelerator.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA08

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Received ※ 29 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 09 October 2021

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MOPSA16

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

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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MOPSA42

Compact S-Band Accelerating Structure for Medical Applications

186

M.V. Lalayan, A. Batov, M. Gusarova, S.M. Polozov, R.A. Zbruev
MEPhI, Moscow, Russia

This paper describes electromagnetic design results for the compact 6.3 MeV electron linac for the radiation therapy facility. Linac is based on S-band biperiodic accelerating structure with inner coupling cells with an increased coupling coefficient.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA42

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Received ※ 01 October 2021 — Revised ※ 02 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 11 October 2021

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MOPSA43

C-Band Linear Accelerator Structure for Radiotherapy

D.A. Pavlov
NRNU MEPHI, Moscow, Russia
S.M. Polozov, S.M. Polozov
MEPhI, Moscow, Russia

Development of a linear electron accelerator energy of 6 MeV operating on 5712 MHz is discussed for radiotherapy. The therapy complex will has the toroidal configuration. The main purpose of work is to design the accelerating structure with length less than 50 cm. Results of beam dynamics simulation will presented in the report. Simulations are performed using BEAMDULAC code to achieve the gaussian distribution of the energy spectrum of the 6 MeV electron beam. First results of the C-band accelerating structure electrodynamics simulations will also presented.

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TUB07

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

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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TUC02

Concept of a New Kurchatov Synchrotron Radiation Source

V. Korchuganov, Ye. Fomin, M.V. Kovalchuk, A.S. Smygacheva, V.A. Ushakov, A.G. Valentinov
NRC, Moscow, Russia
S.M. Polozov
MEPhI, Moscow, Russia

The Kurchatov source of SR has started a project for an upgrade of the accelerator complex based on the existing infrastructure. Instead of the operating 2.5 GeV SR source with a natural emittance of 98 nm-rad, a new 2.5 GeV SR source with a natural emittance less than 3 nm-rad will be built. To ensure its "continuous" operation, a new injection complex (top-up energy injection scheme) - 0.2-2.5 GeV booster synchrotron and 200 MeV linac with transfer lines will be installed. The report gives the concept of the new complex. Also, special attention is paid to the main storage ring operation with insertion devices and problems of electron beam injection in the storage ring at the multi-bunch and single-bunch modes.

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TUZ01

Accelerator Physics and Education: MEPhI Experience and Problems

S.M. Polozov, V.V. Dmitriyeva
MEPhI, Moscow, Russia

Today we have many new interesting accelerators projects in Russia. But the new specialists training and employment is the base problem for the success of new acceerator complexes construction and exploatation. The MEPhI experience of accelerator researchers and engineers training and current successes and problems will presented to start the discussion.

Slides TUZ01 [3.319 MB]

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TUPSB25

Storage Ring Design and Beam Instabilities Investigation for MEPhI’s Photon Source

277

V.S. Dyubkov, S.M. Polozov
MEPhI, Moscow, Russia

Funding: Work supported by Russian Foundation for Basic Research, grant no. 19-29-12036
There is a design of a compact photon source based on inverse Compton scattering at NRNU MEPhI. Updated synchrotron lattice, electron dynamics simulation and beam instabilities studies are presented.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB25

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Received ※ 30 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 23 October 2021

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TUPSB42

Investigation of a Laser Ion Source with Magnetic Contraction of a Plasma Flow

E.D. Vovchenko, K.I. Kozlovskii, S.M. Polozov, A.E. Shikanov
MEPhI, Moscow, Russia

The formation of ion fluxes in a laser-plasma source using azimuthally symmetric magnetic fields is investigated. Because of computer modeling and physical experiments, the possibility of generating ion packets suitable for their effective capture in a linear resonant accelerator with high frequency focusing is shown.

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TUPSB43

Optimization of the RF-Gun With Photocathode at Operating Frequency 2800 MHz for the New Injection Linac for USSR Project

319

Yu.D. Kliuchevskaia, S.M. Polozov
MEPhI, Moscow, Russia
S.M. Polozov
NRC, Moscow, Russia

The beam dynamics analysis of the RF-gun with photocathode for Russian 4th generation light source Ultimate Source of Synchrotron Radiation (USSR-4) was done to chose the optimal length of the section and cell’s number and also to define optimal accelerating gradient and injection phase. The simulation of electrodynamics parameters and RF field distribution in the RF-gun based on 3.5-, 5.5- and 7.5-cell pi-mode standing wave accelerating structure at operating frequency 2800 MHz was done. The influence of the beam loading effect on the field amplitude and beam dynamics was the main purpose of study also. The beam dynamics simulation results will present in the report and optimal RF-gun parameters will discuss.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB43

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Received ※ 15 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 23 October 2021

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WEPSC08

Vacuum Condition Simulations for Vacuum Chambers of Synchrotron Radiation Source

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

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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WEPSC11

Optimization of the RFQ Electrode Construction for Multipactor Discharge Prevention

Y. Lozeev, M. Gusarova, M.A. Guzov, E.N. Indiushnii, A.I. Makarov, S.M. Polozov
MEPhI, Moscow, Russia
M.A. Guzov
RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia

In this paper the study of an opportunity of multipactor discharge appearance in the four-vane RFQ structure was performed. This structure has several regions with thin gaps that have a risk of multipactor discharges. First region is the area close to frequency tuners and the second one is the bottom part of the electrodes. Further, an optimization of construction was proposed to solve this issue.

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WEPSC21

Light Ion Accelerator Magnets

390

I.A. Yurin, M.S. Dmitriyev, E.N. Indiushnii, S.M. Polozov
MEPhI, Moscow, Russia

At the moment, the National Research Nuclear University (MEPhI) is developing an injector for an accelerator of light ions with an energy of 7.5 MeV / nucleon. The injector uses several tens of quadrupole magnets with a magnetic field gradient of 6-18 T / m and several units of dipole magnets. Key requirements for quadrupole magnets include large aperture, compact transverse dimensions, uniform shape and design, ease of fabrication from a manufacturing standpoint, field accuracy within 0.1%, and low power consumption. This article will describe the requirements, simulation results, and preliminary designs for quadrupole and dipole magnets.

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC21

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Received ※ 21 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 15 October 2021

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THA01

Status of the SC HWR Cavities Production for NICA Project

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.

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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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THC03

Numerical Simulations of Space Charge Dominated Beam Dynamics in Experimentally Optimized PITZ RF Photogun

89

V.I. Rashchikov, S.M. Polozov
MEPhI, Moscow, Russia

Funding: The reported study was partly funded by RFBR, project number 19-29-12036
Discrepancies between experimental data and comput-er simulation results of picosecond highly charged beam photoemission are discussed. New space charge limited emission numerical model with positively charged ions arising in the cathode region and dynamically changing during the emission is presented. Estimates on the time characteristics of the charge migrating process in the semiconductor region are given. The numerical results are compared with the results of other numerical models and with experimental observations at the Photo Injector Test facility at DESY in Zeuthen (PITZ)

Slides THC03 [1.292 MB]

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reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-THC03

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

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