Keyword: experiment
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MOPSA02 Experimental Tests of CW Resonance Accelerator With 7.5 MeV High Intensity Electron Beam electron, cavity, 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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MOPSA13 Computer Simulation of the Mechanical Behavior of the FFS Superconducting Quadrupole Coil quadrupole, induction, simulation, vacuum 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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MOPSA15 Thermodynamic Characteristics of the Superconducting Quadrupole Magnets of the NICA Booster Synchrotron quadrupole, booster, synchrotron, radiation 162
 
  • A.A. Bortsova
    JINR/VBLHEP, Dubna, Moscow region, Russia
  • H.G. Khodzhibagiyan, D. Nikiforov
    JINR, Dubna, Moscow Region, Russia
  
  The Booster synchrotron of the NICA accelerator complex in Dubna is designed for acceleration of heavy ions before injection into the Nuclotron. The first run of the Booster synchrotron was carried out in the end of 2020. This work presents calculated and experimental data of static heat leak and dynamic heat releases for quadrupole magnets of the Booster synchrotron with different configuration of the corrector magnets. Obtained results will be taken into account for development of new superconducting magnets and cryogenic installations.  
poster icon Poster MOPSA15 [3.928 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA15  
About • Received ※ 25 September 2021 — Revised ※ 26 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 19 October 2021
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MOPSA16 Design and Characteristics of Cryostat for Testing of Low-Beta 325 MHz Half-Wave Resonators cavity, vacuum, cryomodule, 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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MOPSA40 The PIPLAN Proton-Carbon Ion Radiation Therapy Planning System radiation, proton, simulation, status 179
 
  • A.A. Pryanichnikov
    MSU, Moscow, Russia
  • E.V. Altukhova, I.I. Degtyarev, O.A. Liashenko, F.N. Novoskoltsev, R.Yu. Sinyukov
    IHEP, Moscow Region, Russia
  • A.A. Pryanichnikov, A.S. Simakov
    PhTC LPI RAS, Protvino, Russia
  
  This paper describes the main features of newest version of PIPLAN proton- carbon ion radiation therapy planning system. The PIPLAN 2021 code was assigned for precise Monte Carlo treatment planning for heterogeneous areas, including lung, head and neck location. Two various computer methods are used to modeling the interactions between the proton and carbon ion beam and the patient’s anatomy to determine the spatial distribution of the radiation physical and biological dose. The first algorithm is based on the use of the RTS&T 2021 precision radiation transport code system. The second algorithm is based on the original Ulmer’s method for primary proton beam and adapted Ulmer’s algorithm for primary carbon ion beam.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA40  
About • Received ※ 24 September 2021 — Revised ※ 25 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 09 October 2021
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MOPSA47 Verification of a Beam of Epithermal Neutrons for Boron-Neutron Capture Therapy neutron, radiation, proton, detector 199
 
  • G.D. Verkhovod
    Budker INP & NSU, Novosibirsk, Russia
  • D.A. Kasatov, Ia.A. Kolesnikov, S.Yu. Taskaev
    NSU, Novosibirsk, Russia
  • D.A. Kasatov, Ia.A. Kolesnikov, A.N. Makarov, S. Savinov, I.M. Shchudlo, T. Sycheva, S.Yu. Taskaev
    BINP SB RAS, Novosibirsk, Russia
  • S. Savinov
    BINP & NSTU, Novosibirsk, Russia
  
  Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005.
At Budker Institute of Nuclear Physics it was proposed and developed a source of epithermal neutrons based on a tandem accelerator with vacuum insulation and a lithium target for the development of boron neutron capture therapy, a promising method for treating malignant tumors. To measure the "boron" dose due to the boron-lithium reaction, a small-sized detector has been developed. It consists of two polystyrene scintillators, one of which is enriched with boron. Using the detector, the spatial distribution of boron dose and dose of gamma radiation in a 330x330x315 mm water phantom was measured and the results obtained were compared with the results of numerical simulation of the absorbed dose components in such a tissue-equivalent phantom. It is shown that the results obtained are in good agreement with the calculated ones. It was found that the use of a 72 mm Plexiglas moderator provides an acceptable quality of the neutron beam for in vitro and in vivo studies, namely: 1 mA 2.05 MeV proton beam on a lithium target provides a dose rate of 30 Gy-Eq/h in cells containing boron at a concentration of 40 ppm, and 6 Gy-Eq/h in cells without boron. The developed technique for on-line measurement of boron dose and dose of gamma radiation makes it possible to carry out a similar verification of a neutron beam prepared for clinical trials of BNCT after placing a neutron beam shaping assembly with a magnesium fluoride moderator in a bunker adjacent to the accelerator. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA47  
About • Received ※ 27 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 22 October 2021
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MOPSA54 Calculation of Dose Fields and Energy Spectra of Secondary Radiation in the Extraction Zone of a Synchrotron Accelerator for Protons With Energies Up to 700 MeV proton, radiation, simulation, synchrotron 222
 
  • R.P. Truntseva, N.N. Kurapov, A.M. Opekunov
    RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia
  • A.V. Telnov, N.V. Zavyalov
    VNIIEF, Sarov, Russia
  
  The possibility of using a multipurpose synchrotron accelerator for researching the processes of heavy charged particles interaction with various materials is considered. The accelerator provides proton energies up to 700 MeV. It is necessary to evaluate the emerging dose fields at the design stage of the experimental room. In this case, it is important to evaluate the dose distribution, energies and types of secondary radiation that may enter the adjacent rooms. This paper presents the results of the radiation environment evaluation in the radiation extraction zone of the synchrotron accelerator. Simulation results of secondary radiation energy spectra near the walls, which separate the irradiation zone from adjacent rooms, are presented. Proton energies are equal to 60, 85, 110 and 700 MeV are considered. Simulation was performed by the Monte Carlo method in a program developed using Geant4* libraries.
* Geant4 User’s Guide for Application Developers //Geant4 Collaboration. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA54  
About • Received ※ 27 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 11 October 2021
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MOPSA55 Beam-induced Background Simulations for the CMS Experiment at the LHC detector, simulation, background, radiation 225
 
  • I.L. Azhgirey, I.S. Bayshev, I.A. Kurochkin, A.D. Riabchikova
    IHEP, Moscow Region, Russia
  • A.E. Dabrowski
    CERN, Geneva, Switzerland
  • S. Mallows
    KIT, Karlsruhe, Germany
  
  Beam-induced background comes from interactions of the beam and beam halo particles with either the residual gas in the vacuum chamber of accelerator or the collimators that define the beam aperture. Beam-induced processes can potentially be a significant source of background for physics analyses at the LHC. This contribution describes the simulation software environment used for this part of the CMS experiment activity and recent beam-induced background simulation results for the Phase-2 CMS operation design.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA55  
About • Received ※ 14 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 14 October 2021
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MOPSA57 Experimental Investigation the Synthetic Crystal Diamond Plates of Methods of Positron Annihilation Spectroscopy positron, electron, radiation, laser 231
 
  • M.K. Eseev
    NArFU, Arhangelsk, Russia
  • A.G. Kobets, I.N. Meshkov, O. Orlov, A.A. Sidorin
    JINR, Dubna, Moscow Region, Russia
  • A.G. Kobets
    IERT, Kharkov, Ukraine
  • K. Siemek
    JINR/DLNP, Dubna, Moscow region, Russia
  • K. Siemek
    IFJ-PAN, Kraków, Poland
  
  The results of experimental studies of synthetic diamond plates as a promising element of X-ray optics of synchrotrons by positron annihilation spectroscopy using the LNP im. V.P. Dzhelepov, JINR.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA57  
About • Received ※ 25 September 2021 — Revised ※ 02 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 17 October 2021
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TUA01 VEPP-4M Electron Positron Collider Operation at High Energy electron, polarization, luminosity, laser 34
 
  • P.A. Piminov, G.N. Baranov, A.V. Bogomyagkov, V.M. Borin, V.L. Dorokhov, S.E. Karnaev, K.Yu. Karyukina, V.A. Kiselev, E.B. Levichev, O.I. Meshkov, S.I. Mishnev, I.A. Morozov, I.B. Nikolaev, I.N. Okunev, A.G. Shamov, E.A. Simonov, S.V. Sinyatkin, E.V. Starostina, V.N. Zhilich, A.A. Zhukov, A.N. Zhuravlev
    BINP SB RAS, Novosibirsk, Russia
  • C. Todyshev
    Budker Institute of Nuclear Physics, Novosibirsk, Russia
  
  VEPP-4M is an electron positron collider equipped with the universal KEDR detector for HEP experiments in the beam energy range from 1 GeV to 6 GeV. A unique feature of VEPP 4M is the high precision beam energy calibration by resonant polarization technique which allows conducting of interesting experiments despite the low luminosity of the collider. Recently we have started new luminosity acquisition run above 2 GeV. The hadron cross section was measured from 2.3 GeV to 3.5 GeV has been done. The luminosity run for gamma-gamma physics has been started. The luminosity at Y(1S) meson has been obtained. For the beam energy calibration the laser polarimeter is used. The paper discusses recent results from VEPP 4M collider.  
slides icon Slides TUA01 [4.705 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUA01  
About • Received ※ 25 September 2021 — Revised ※ 08 October 2021 — Accepted ※ 13 October 2021 — Issued ※ 22 October 2021
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TUB03 Methods and Systematic Errors for Searching for the Electric Dipole Moment of Charged Particle Using a Storage Ring dipole, storage-ring, proton, site 44
 
  • V. Senichev, A.E. Aksentyev, A.A. Melnikov
    RAS/INR, Moscow, Russia
  
  One of possible argument for CP-invariance violation is the existence of non-vanishing electric dipole moment (EDM) of elementary particles. To search for the EDM the BNL proposed to construct a special ring implementing the frozen spin mode in order to detect the EDM signal. Since systematic errors determine the sensitivity of a method, this article analyzes some major methods proposed for searching for the EDM from the point of view of this problem. The frequency domain method (FDM) proposed by the authors does not require a special accelerator for deuterons and requires spin precession frequency measurements only. The method has four features: the total spin precession frequency due both to the electric and the magnetic dipole moments in an imperfect ring in the longitudinal-vertical plane is measured at an absolute statistic error value of ~10-7 rad/sec in one ring filling; the ring elements position remain unchanged when changing the beam circulation direction from clockwise (CW) to counterclockwise (CCW); calibration of the effective Lorentz factor by means of spin precession frequency measurements in the horizontal plane is carried out alternately in each CW and CCW procedure; the approximate relationship between the spin precession frequency components is set to exclude them from mixing to the expected EDM signal at a statistical sensitivity level approaching 10-29 e cm. The FDM solves the problem of systematic errors, and can be applied in the NICA facility.  
slides icon Slides TUB03 [6.184 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUB03  
About • Received ※ 10 September 2021 — Revised ※ 18 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 17 October 2021
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TUC03 Development of Powerful Long-Pulse THz-Band FEL Driven by Linear Induction Accelerator FEL, electron, undulator, simulation 58
 
  • N.Yu. Peskov, V.I. Belousov, N.S. Ginzburg, D.I. Sobolev, V.Yu. Zaslavsky
    IAP/RAS, Nizhny Novgorod, Russia
  • A.V. Arzhannikov, D.A. Nikiforov, E.S. Sandalov, S.L. Sinitsky, D.I. Skovorodin, A.A. Starostenko, K.I. Zhivankov
    BINP SB RAS, Novosibirsk, Russia
  
  Funding: This work is supported by the Russian Science Foundation (grant #19-12-00212).
Project of high-power long-pulse THz-band FEL is under development in collaboration between BINP (Novosibirsk) and IAP RAS (N.Novgorod) driven by the linac LIU 5 - 20 MeV / 2 kA / 200 ns. The aim of this project is to achieve a record sub-GW power level and pulse energy content up to 10 - 100 J at THz frequencies. Principal problems in realization of this generator include: formation of the electron beam with parameters acceptable for operation in the short-wavelength ranges, development of undulator for pumping operating transverse oscillations in the beam, and elaboration of electrodynamic system that can provide stable narrow-band oscillation regime in a strongly oversized interaction space. Initial proof-of-principle experiments are planned to start at the LIU-5 accelerator in the 0.3 THz frequency range, with prospects of transition to 0.6 THz range and higher frequencies after positive results would be demonstrated. In the report, the design parameters of the FEL project are discussed. Results of electron-optical experiments on the beam formation are presented. Structural elements of the FEL magnetic system based on helical undulator and a guide solenoid that provides intense beam transportation were elaborated. An electrodynamic system was proposed exploiting advanced Bragg structures, which have significantly improved selective properties. Structures of such type were designed with the diameter of 20 and 40 wavelengths for operation in specified frequency ranges. 		 
slides icon Slides TUC03 [4.780 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUC03  
About • Received ※ 24 September 2021 — Revised ※ 25 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 28 September 2021
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TUPSB04 Features of the Electronic Cooling System of the NICA Booster electron, booster, gun, cathode 236
 
  • A.G. Kobets, E.V. Ahmanova, S.A. Melnikov, I.N. Meshkov, O. Orlov, S.V. Semenov, A.S. Sergeev, A.A. Sidorin
    JINR, Dubna, Moscow Region, Russia
  • A.V. Butenko, K.G. Osipov, A.O. Sidorin, E. Syresin
    JINR/VBLHEP, Dubna, Moscow region, Russia
  • A.V. Ivanov
    BINP SB RAS, Novosibirsk, Russia
  
  The report presents the results obtained during the commissioning the Electron Cooling System (ECS) of the Booster, the first in the chain of three synchrotrons of the NICA accelerator complex. The work was performed without an ion beam and with a circulating ion beam He1+. In the work with a circulating ion beam, the effect of reducing the lifetime of the circulating ions was observed when the velocities of the cooling electrons and the cooled ions coincide. The dependences of the electron beam current on the ECS parameters for different electron energy values were experimentally obtained. The specific features of operation of electron gun of the NICA Booster are hollow beam formation and the phenomenon of virtual cathode creation confirmed both experiments and by numerical simulation.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB04  
About • Received ※ 20 September 2021 — Revised ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 13 October 2021
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TUPSB17 Investigations of Charge Particle Dynamics in Space Charge Fields ECR, space-charge, gun, site 265
 
  • A.S. Chikhachev
    Allrussian Electrotechnical Institute, Moskow, Russia
  
  The work examines the transient dynamics of single-component systems. The problem on dynamics of flat layer and spherical symmetric configuration is considered. A classical collision-free system is considered, described using the "Meshchersky integral" and the "conjugate" integral of motion. States characterized by constant charge in non-stationary coordinates are obtained  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB17  
About • Received ※ 09 September 2021 — Revised ※ 20 September 2021 — Accepted ※ 23 September 2021 — Issued ※ 23 September 2021
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TUPSB32 Emission of Photons at the Interaction of a High-Energy Positron Beam with a Periodically Deformed Crystal undulator, radiation, positron, photon 289
 
  • A.A. Yanovich, A.G. Afonin, G.I. Britvich, M.Yu. Chesnokov, Y.A. Chesnokov, A.A. Durum, M.Yu. Kostin, I.S. Lobanov, V.I. Pitalev, I.V. Poluektov, Yu.E. Sandomirskiy
    IHEP, Moscow Region, Russia
  
  Funding: Russian science foundation (grant 17-12-01532)
Periodically deformed crystals have long attracted at-tention as "crystalline undulators". In the experi-ment carried out at the U-70 accelerator, the radiation of positrons moving in a periodically deformed crystal was observed. Experimental evidence has been obtained for an undulator peak in a radiation spectrum, which is quali-tatively consistent with calculations. It is shown that most of the emitted energy is due to hard photons with energies of tens of MeV as a result of channeling and reflection of particles, whose spectral density is several times higher than the radiation in an amorphous target. 		 
poster icon Poster TUPSB32 [0.864 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB32  
About • Received ※ 06 September 2021 — Accepted ※ 10 September 2021 — Issued ※ 17 September 2021  
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TUPSB36 High Intensity Calcium, Chromium and Titanium Ion Beams from the Permanent Magnet ECR Ion Source DECRIS-PM cyclotron, ECR, ion-source, ECRIS 303
 
  • D.K. Pugachev, S.L. Bogomolov, A.E. Bondarchenko, A.A. Efremov, K. Gikal, K.I. Kuzmenkov, V.N. Loginov, V. Mironov
    JINR, Dubna, Moscow Region, Russia
  • A.A. Protasov
    JINR/FLNR, Moscow region, Russia
  
  The first experiment at the Super Heavy Elements Factory (SHE) was launched at the end of 2020. The result of the experiment with a calcium ion beam and an Americium target is more than 100 events of the synthesis of Moscovium. The last two years have shown good capabilities of the Factory. These results allow us to start preparing for the synthesis of SHE with atomic number >118. For this experiment, we have to use heavier ion beams, such as titanium and chromium. The article describes the method, technique, and last experimental results on the production of metal ion beams such as 48Ca, 48Ti, 52Cr, and 54Cr ion beams at the DC-280 cyclotron from the DECRIS-PM ion source.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB36  
About • Received ※ 13 September 2021 — Revised ※ 25 September 2021 — Accepted ※ 29 September 2021 — Issued ※ 05 October 2021
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TUPSB47 Stability Conditions for a Penning Trap with Rotating Quadrupole or Dipole Electric Fields quadrupole, dipole, space-charge, synchrotron 324
 
  • A.D. Ovsyannikov
    Saint Petersburg State University, Saint Petersburg, Russia
  
  The dynamics of particles in a Penning Malmberg Surko trap with Rotating Wall (rotating quadrupole and/or dipole electric field) and a buffer gas is considered. Electromagnetic traps are widely used for the accumulation and confinement of charged particles during various experiments in nuclear and accelerator physics, mass spectroscopy, and other fields. Traps are the main element of sources of charged particles in accelerators. An especially important role is played by traps with efficient accumulation during operation (in a cyclic mode) of ion synchrotrons and colliders with short-lived isotopes. The purpose of this work was to develop algorithms for constructing regions of asymptotic stability (according to Lyapunov) in the space of parameters describing additional rotating electric fields, and to determine the analytical conditions that must be satisfied by the trap parameters to achieve a given degree of stability. The influence of the space charge of a beam of accumulated particles on the stability of the system is also investigated. The calculation results and the proposed models can be used in the selection and adjustment of the main parameters of the designed traps of the considered type.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB47  
About • Received ※ 30 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 15 October 2021  
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TUPSB48 Optimization of the Geometric Characteristics of the Laser Beam in a Multi-Pass Scheme of Nonlinear Amplification of the Master Oscillator Illumination laser, plasma, ion-source, heavy-ion 327
 
  • Yu.A. Satov, A. Balabaev, I.A. Khrisanov, T. Kulevoy, A.A. Losev, A. Shumshurov, A.A. Vasilyev
    ITEP, Moscow, Russia
  
  The paper presents the results of numerical simulation of the CO₂ MOPA laser scheme which is designed to generate powerful short radiation pulses in the ion source circuit. It is based on the nonlinear nature of the amplification of the master-oscillator pulse radiation, the front of which is formed by a nonlinear absorber. The paper considers the influence of the geometric parameters of the entrance beam in a four-pass amplification scheme. It is shown that for a fixed value of the small signal gain the maximum amplification effect is achieved with a certain formation of the spatial characteristics of the laser beam at the input to the amplifier. So some central uniform part of MO beam which has a Gaussian spatial profile is used in the telescopic amplifier. In this case, despite significant aperture losses, the maximum energy at the output of the amplifier is achieved with optimizing the beam diameter.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB48  
About • Received ※ 24 September 2021 — Revised ※ 26 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 19 October 2021
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TUPSB51 Measurement of Neutron Field Functionals Around a Neutron Converter of 50 GeV Protons neutron, proton, detector, hadron 330
 
  • Ja.N. Rascvetalov, Yu.V. Beletskaya, A.G. Denisov, A.A. Durum, V.L. Ilukin, A. Mamaev, V.N. Peleshko, I.N. Piryazev, E.N. Savitskaya, M.M. Sukharev, S.E. Sukhikh, A.A. Yanovich
    IHEP, Moscow Region, Russia
  
  The experiment was performed on a pulsed neutron source of the "Neutron" research bench, being created at the U-70 accelerator at National Research Center "Kurchatov Institute" - IHEP, Protvino. Neutrons were generated by the 50 GeV proton beam in the special converter. As a measurement method, neutron activation analysis was used with a set of threshold activation detectors made of C, Al, Nb, In, Bi materials. The neutron energy thresholds of these detectors are in the range from 1 MeV to 75 MeV. The aluminium activation foils were used to calculate the absolute values of the proton quantities in the exposures. The results of measurements and calculations are presented in the form of the following functionals: nuclides activity of threshold reactions in detectors at the end of the exposure; reaction rate; neutron fluences with energies greater than the threshold. To estimate these values, the spectra of neutrons, protons and pions were calculated using the particle transport codes MARS and HADRON with the FAN15 as a low-energy block. It was found that neutrons dominate up to 100 MeV, and the charged hadrons contribution to the total reaction rate for a particular nuclide formation can range from 4% to 46%.  
poster icon Poster TUPSB51 [1.129 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB51  
About • Received ※ 15 September 2021 — Accepted ※ 29 September 2021 — Issued ※ 04 October 2021  
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WED04 Precise Analysis of Beam Optics at the VEPP-4M by Turn-by-Turn Betatron Phase Advance Measurement optics, collider, lattice, betatron 79
 
  • I.A. Morozov, P.A. Piminov, I.S. Yakimov
    BINP SB RAS, Novosibirsk, Russia
  
  Turn-by-turn (TbT) beam centroid signals can be used to evaluate various relevant accelerator parameters including betatron frequencies and optical functions. Accurate estimation of parameters and corresponding variances are important to drive accelerator lattice correction. Signals acquired from beam position monitors (BPMs) are limited by beam decoherence and BPM resolution. Therefore, it is important to obtain accurate estimations from available data. Several methods based on harmonic analysis of TbT data are compared and applied to the VEPP-4M experimental signals. The accuracy of betatron frequency, amplitude, and phase measurements are investigated. Optical functions obtained from amplitudes and phases are compared.  
slides icon Slides WED04 [3.771 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WED04  
About • Received ※ 12 September 2021 — Revised ※ 20 September 2021 — Accepted ※ 23 September 2021 — Issued ※ 20 October 2021
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WEPSC06 Asess Input Data Uncertainties in Thermal-Mechanical Calculations of the Outlet Window Membrane of the LUE-200 Accelerator electron, neutron, operation, simulation 352
 
  • I.V. Burkov
    JINR/FLNP, Moscow Region, Russia
  • A.P. Sumbaev
    JINR, Dubna, Moscow Region, Russia
  
  The maximum values of the temperature fields and stress-strain state are calculated for various configurations of the outlet window membrane of the LUE-200 accelera-tor with assessing uncertainties in input data. The ther-momechanical parameters are estimated by simulating the electron beam pulsed action mode on the membrane in the computational models based on the mathematical description of the most significant physical processes. The obtained numerical modelling results demonstrated the importance of assessing uncertainties in input data for substantiating the safe operation limits of IREN facility.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC06  
About • Received ※ 24 September 2021 — Revised ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 09 October 2021
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WEPSC33 Increasing Quality of Experiment Interpretation in Real-Time for the Tandem Accelerator software, neutron, target, real-time 407
 
  • A.M. Koshkarev, Ia.A. Kolesnikov, A.N. Makarov, S.Yu. Taskaev
    BINP SB RAS, Novosibirsk, Russia
  • T.A. Bykov, E.O. Sokolova
    Budker INP & NSU, Novosibirsk, Russia
  • Ia.A. Kolesnikov, E.O. Sokolova, S.Yu. Taskaev
    NSU, 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 Budker Institute of Nuclear Physics for Boron Neutron Capture Therapy - promising method for treatment of tumors and for other applications. The paper proposes and implements a flexible and customizable method of operational data processing, allowing researchers to obtain and analyze information directly in the experiment without the need for post-processing data. Its use accelerates the process of obtaining informative data during experimental research and automates the analysis process. Also proposed and implemented a process of automatic distributed journaling of the results of the experiment. As a result of the implementation of the proposed tools increased the productivity of the analysis of experimental data and the detailing of the experimental journal. The developed and implemented system of real-time data processing has shown its effectiveness and has become an integral part of the control system, data collection and data storage of the epithermal neutron source. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC33  
About • Received ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 14 October 2021  
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WEPSC40 Detection of Anomalies in BPM Signals at the VEPP-4M ISOL, detector, optics, simulation 420
 
  • I.A. Morozov, P.A. Piminov
    BINP SB RAS, Novosibirsk, Russia
  
  Beam position monitors (BPMs) are widely used for beam diagnostics in particle accelerators. Turn-by-turn (TbT) beam centroid data provide a means to estimate performance-critical accelerator parameters, like betatron frequency and optical functions. Parameter estimation accuracy is heavily related to TbT data quality. BPM faults might lead to erroneous estimation of accelerator parameters and should be accounted for achieving accurate and reliable results. Several anomaly detection methods for TbT data cleaning are considered. Derived features of BPM signals along with their robust dispersion estimation are used to flag faulty BPM signals. Estimated contamination factor is used with unsupervised learning methods (Local Outlier Factor and Isolation Forest). Application of anomaly detection methods for the VEPP-4M experimental TbT data is reported.  
poster icon Poster WEPSC40 [2.681 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC40  
About • Received ※ 05 September 2021 — Accepted ※ 20 September 2021 — Issued ※ 21 September 2021  
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WEPSC42 RF Cavity Based Charge Detector for a Low Charge Ultra Sort Singe Electron Bunch Measurement detector, electron, cavity, 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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WEPSC45 Measurement of the Electron Beam Spectrum by the Absorbing Filters Method During a Single Pulse electron, gun, operation, high-voltage 430
 
  • A.A. Drozdovsky, A.V. Bogdanov, S.A. Drozdovsky, A.V. Kantsyrev, A. Khurchiev, V.A. Panyushkin, S.M. Savin, A.V. Skobliakov, S.A. Visotski, V.A. Volkov
    ITEP, Moscow, Russia
  
  Funding: Work supported by R&D Project between NRC "Kurchatov Institute" - ITEP and TRINITI
The interest in measuring spectrum of electron beams by the method of absorbing filters is due to its technical accessibility, compactness, efficiency and usability at various research facilities. The complexity of this method lies in severe ill-posedness of the inverse problem of reconstruction the spectrum from the beam absorption. The task of our work is the operational control of the spectrum of a beam with the maximum energy up to 300 keV. The current collector package consists of 16 insulated identical aluminum foils with the 1 mm gap between. The thickness range of the foils is 10 to 25 microns, depending on the maximum electron energy. The charge of the foils after passing the beam is measured by the ADC. The assembly geometry was calculated by the Monte Carlo method to determine the accumulation of charges on foils when monoenergetic beams are transmitted in the range from 10 to 300 keV with step increment of 10 keV. The inverse problem was solved by Tikhonov regularization. It turned out that a high-accuracy fitting of the input data and the transformation kernel by statistical distributions is the primary factor, which allows to reduce the regularization parameter to almost zero. The validity of the technique applied is confirmed by the fact that the spectrum obtained at the maximum electron energy of the beam of 250 keV is in satisfactory agreement with the spectrum measured on a magnetic spectrometer. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC45  
About • Received ※ 20 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 09 October 2021
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WEPSC55 Development of the Low Intensity Extraction Beam Control System at Protom Synchrotron for Proton Radiography Implementation proton, extraction, controls, synchrotron 439
 
  • A.A. Pryanichnikov, Belikhin, M.A. Belikhin, A.E. Shemyakov, P.B. Zhogolev
    PhTC LPI RAS, Protvino, Russia
  • Belikhin, M.A. Belikhin, A.A. Pryanichnikov, A.E. Shemyakov, P.B. Zhogolev
    Protom Ltd., Protvino, Russia
  • Belikhin, M.A. Belikhin, A.P. Chernyaev, A.A. Pryanichnikov
    MSU, Moscow, Russia
  • V. Rykalin
    ProtonVDA, Naperville, Illinois, USA
  
  Currently, the calculation of the proton range in patients receiving proton therapy is based on the conversion of Hounsfield CT units of the patient’s tissues into the relative stopping power of protons. Proton radiography is able to reduce these uncertainties by directly measuring proton stopping power. However, proton imaging systems cannot handle the proton beam intensities used in standard proton therapy. This means that for implementation of proton radiography it is necessary to reduce the intensity of the protons significantly. This study demonstrates the current version of the new beam control system for low proton intensity extraction. The system is based on automatic removable unit with special luminescence film and sensitive photoreceptor. Using of the removable module allows us to save initial parameters of the therapy beam. Remote automatic control of this unit will provide switch therapy and imaging modes between synchrotron cycles. The work describes algorithms of low flux beam control, calibration procedures and experimental measurements. Measurements and calibration procedures were performed with certified Protom Faraday Cup, PTW Bragg Peak Chamber and specially designed experimental external detector. The development can be implemented in any proton therapy complexes based on the Protom synchrotron. This allow us to use initial synchrotron beam as a tool for patient verification and to eliminate proton range uncertainties.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC55  
About • Received ※ 17 September 2021 — Accepted ※ 20 September 2021 — Issued ※ 04 October 2021  
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THC03 Numerical Simulations of Space Charge Dominated Beam Dynamics in Experimentally Optimized PITZ RF Photogun cathode, electron, space-charge, laser 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 icon 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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FRA01 Peculiarities of Producing 48Ca, 48Ti, 52Cr Beams at the DC-280 Cyclotron ECR, cyclotron, acceleration, injection 93
 
  • K. Gikal, S.L. Bogomolov, I.A. Ivanenko, N.Yu. Kazarinov, D.K. Pugachev, V.A. Semin
    JINR, Dubna, Moscow Region, Russia
  • V.I. Lisov, A.A. Protasov
    JINR/FLNR, Moscow region, Russia
  
  The first beam of 84Kr14+ ions was accelerated in the DC-280 on December 26, 2018 and extracted to the ion transport channel on January 17, 2019. In March 2019, beams of accelerated 84Kr+14 ions with intensity of 1.36 pmkA and 12C+2 ions with and intensity of 10 pmkA were extracted from the DC-280 to the beam transport channel with energy about 5.8 MeV/nucleon. In 2020-2021 years, beams of 48Ca7+,10+ ions with intensity up to 10,6 pmkA were accelerated and 7,1 pmkA were extracted from the DC-280 to the beam transport channel with energy about 4,51 - 5,29 MeV/nucleon. In 2021 year, beams of accelerated 52,54Cr10+ ions with intensity up to 2,5 pmkA were extracted from the DC-280 to the beam transport channel with energy about 5,05 MeV/nucleon and beams of 48Ti7+ with intensity up to 1pmkA and with energy about 4,94 MeV/nucleon The main task of the new accelerator is implementation of the long-term program of researches on the SHE Factory aimed on synthesis of new elements (Z>118) and detailed studying of nuclear- physical and chemical properties of earlier opened 112-118 ones.  
slides icon Slides FRA01 [9.228 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRA01  
About • Received ※ 18 September 2021 — Revised ※ 25 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 16 October 2021
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FRA04 The Experimental Research of Cyclotron DC-280 Beam Parameters cyclotron, controls, diagnostics, electron 102
 
  • V.A. Semin, K. Gikal, I.V. Kalagin, N.Yu. Kazarinov, V.I. Mironov, S.V. Mitrofanov, Yu.G. Teterev
    JINR, Dubna, Moscow Region, Russia
  • A. Issatov, L.A. Pavlov, A.A. Protasov
    JINR/FLNR, Moscow region, Russia
  
  The DC-280 is the high intensity cyclotron for Super Heavy Elements Factory in FLNR JINR. It was designed for production of accelerated ions beam with intensity up 10 pµA to energy in range 4 - 8 MeV/n. The beam power is up 3,5 kW. The diagnostics elements shall be capable of withstanding this power. Moreover such intensity beam required continuous control for avoid of equipment damage. Special diagnostic equipment were designed, manufactured and commissioning. During the design the calculation of thermal loads was made. Some of them were tested before installation on cyclotron. Diagnostic elements used on DC-280 cyclotron are described in this paper. The special Faraday cup was designed for beam cur-rent measurement. The moving inner probe and multylamellar probe are inside the cyclotron. The Scanning two-dimension ionization profile monitor was produced for space distribution analysis of accelerated high intensity beam. Inner Pickup electrode system with special elec-tronic was created for beam phase moving analysis. Time of flight system based on two pick-up electrodes for energy measured was placed in transport channel. These and over diagnostic system were commissioned and tested. The results present in report.  
slides icon Slides FRA04 [16.527 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRA04  
About • Received ※ 29 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 13 October 2021 — Issued ※ 22 October 2021
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FRB06 The Results Obtained on "Radiobiological Stand" Facility, Working with the Extracted Carbon Ion Beam of the U-70 Accelerator target, dipole, status, radiation 124
 
  • V.A. Pikalov, A.G. Alexeev, Y.M. Antipov, V.A. Kalinin, A.V. Koshelev, A.V. Maximov, M.P. Ovsienko, M.K. Polkovnikov, A.P. Soldatov
    IHEP, Moscow Region, Russia
  
  This report provides an information of present status of the "Radiobiological stand" facility at the extracted carbon ions beam of the U-70 accelerator. The results of the development of the RBS facility are presented. A plans for development an experimental medical center for carbon ion therapy on the basis of the U-70 accelerator complex are also reported.  
slides icon Slides FRB06 [11.249 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRB06  
About • Received ※ 26 September 2021 — Revised ※ 08 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 23 October 2021
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FRB07 Transmission Studies With Ion Beams Within FAMA ion-source, target, quadrupole, light-ion 127
 
  • Z.M. Jovanovic, R. Balvanovic, M.M. Ćosić, N. Neskovic, I. Teleski
    VINCA, Belgrade, Republic of Serbia
  
  Funding: Ministry of Education, Science and Technological Development of the Republic of Serbia.
FAMA is a user facility for materials science with low energy ions beams in the Vinca Institute of Nuclear Sciences, Belgrade, Serbia. It includes a heavy ion source, a light ion source, two channels for modification of materials, and two channels for analysis of materials. Recently, designing of a channel for transmission studies within FAMA, the C3 channel, has begun. The initially planned studies are related to the rainbow effects with electrostatic very thin lenses (VTLs) and two-dimensional (2D) materials. In the former case, the main aim is to develop a method for generation of narrow ion beams, to be used, for example, in materials science and technology. The main aim in the latter case is to determine precisely the interaction potential of the projectile and target atoms. In both cases, the theoretical basis of the explorations is the theory of crystal rainbows. From the technological point of view, construction and use of the C3 channel includes the following challenges: (i) production and diagnostics of the narrow and parallel ion beams to be directed to the chosen VTLs and 2D materials, (ii) registration of the transmitted ion beams with high resolution 2D position sensitive detectors, (iii) preparation of the 2D materials and maintaining their cleanliness during the measurements, and (iv) providing the ultra-high vacuum conditions in measurements with the 2D materials. 		 
slides icon Slides FRB07 [11.209 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRB07  
About • Received ※ 27 September 2021 — Revised ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 13 October 2021
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FRC01 Neutron Field Measurements by GFPC Based Monitors at the Carbon Beam of IHEP U-70 Proton Synchrotron neutron, simulation, synchrotron, radiation 129
 
  • O.V. Sumaneev, I.L. Azhgirey, I.S. Bayshev, V.A. Pikalov
    IHEP, Moscow Region, Russia
  
  Neutron monitors with gas filled proportional counters as a sensitive element were presented at RuPAC-2018. These monitors have been used recently to measure fast neutron fluxes near the carbon beam based experimental facility at IHEP. The experimental facility "Radiobiological test setup at the U-70 accelerator" was built at NRC "Kurchatov Institute" - IHEP, Protvino, to carry out radiobiological and physical experiments on the extracted beam of carbon nuclei with an energy up to 450 MeV/nucleon. The measurements were compared with the CERN FLUKA code simulations.  
slides icon Slides FRC01 [0.859 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRC01  
About • Received ※ 30 September 2021 — Revised ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 22 October 2021
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