Keyword: simulation
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MOY05 Linear Induction Accelerator LIA-2 Upgrade cathode, focusing, induction, space-charge 17
 
  • D.A. Starostenko
    BINP SB RAS, Novosibirsk, Russia
  
  X-ray complexes based on a linear induction accelerator are designed to study of high density objects. It requires of high-current electron beam to obtain a small spot and bright x-ray source using a conversion target. The electrons source in such installations is injectors capable generate pulses with a duration from tens of nanoseconds to several microseconds and a current of several kiloamperes. The transportation and focusing such beams into diameter about 1 mm is difficult due to of the space charge effect. In similar induction accelerators (DARHT, AIRIX, FXR, etc.), auto-emission cathodes are used to obtain high-current electron beams. The use of a thermionic cathode, in compared to auto-emission cathode, provides stable generation of several pulses with a time interval of several microseconds, but makes high requirements on the injector vacuum system: not less than 10-7 Torr.  
slides icon Slides MOY05 [3.946 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOY05  
About • Received ※ 24 September 2021 — Revised ※ 05 October 2021 — Accepted ※ 13 October 2021 — Issued ※ 23 October 2021
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MOPSA07 200 MeV Linear Electron Accelerator - Pre-Injector for a New Kurchatov Synchrotron Radiation Source injection, linac, synchrotron, ion-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 gun, linac, injection, cathode 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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MOPSA11 Room Temperature Folding Segment for a Transfer of Multiple Charge States Uranium Ions Between Sections of Linac-100 linac, heavy-ion, electron, emittance 153
 
  • V.S. Dyubkov
    MEPhI, Moscow, Russia
  
  Beam dynamics simulations results of multiple charge states uranium ions (238U59+,60+,61+) in a transfer line between two LINAC-100 superconducting sections of DERICA project (JINR, Dubna, Russia) are presented. Transfer line is an advanced magnetic optical system and provides beams bending on 180 degrees. Transfer line options are proposed. Parameters of its optic element are chosen so that dispersion function has zero value at the start and end of the channel for transporting the 50 MeV/nucleon ion beams.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA11  
About • Received ※ 28 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 17 October 2021  
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MOPSA13 Computer Simulation of the Mechanical Behavior of the FFS Superconducting Quadrupole Coil quadrupole, induction, vacuum, experiment 156
 
  • A.D. Riabchikova, A.I. Ageev, Altukhov, Y.V. Altukhov, I. Bogdanov, S. Kozub, T. Ryabov, L. Tkachenko
    IHEP, Moscow Region, Russia
  
  In the frame of the work, carried out at the Research Center of the Kurchatov Institute - IHEP on the development of four wide-aperture superconducting quadrupoles, a mathematical study of the mechanical behavior of the coil block of these magnets was carried out. The quadrupoles are intended for use in the magnetic final focusing system (FFS) of the ion beam in the experiments of the HED@FAIR collaboration. At the design stage of superconducting magnets, it is necessary to perform mathematical modeling to analyze the deformation of coil blocks during the assembly stages, cooling to operating temperature and the influence of ponderomotor forces. The results of computer simulation of changes in the geometry and distribution of forces in the coil block at all these stages are necessary to determine the value of the preliminary mechanical stress in the superconducting coil. The main results of numerical simulation of the mechanics of these magnets are presented in the article.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA13  
About • Received ※ 26 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 09 October 2021
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MOPSA40 The PIPLAN Proton-Carbon Ion Radiation Therapy Planning System radiation, proton, experiment, 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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MOPSA41 Effect of a Proton Beam from a Linear Accelerator for Radiation Therapy proton, radiation, distributed, linac 182
 
  • L. Ovchinnikova, S.V. Akulinichev, A.P. Durkin, A. Kolomiets, V.V. Paramonov
    RAS/INR, Moscow, Russia
  • A. Kurilik
    Private Address, Moscow, Russia
  • L. Ovchinnikova
    Ferrite Domen Co., St. Petersburg, Russia
  
  Linear accelerators can provide beam characteristics that cannot be achieved by circular accelerators. We refer to the concept of a compact linac for creating a proton accelerator with a maximum energy of 230 MeV, operating in a pulsed mode. The linac is designed to accelerate up to 1013 particles per 10 to 200 seconds irradiation cycle and is capable of fast adjustment the output energy in the range from 60 to 230 MeV, forming a pencil-like beam with a diameter of ~2 mm. Simulation of dose distribution from a proton beam in a water phantom has been performed. The radiological effect of the linac beam during fast energy scanning is considered, and the features for providing the high dose rate flash radiation therapy are specified. The possibility of a magnetic system for increasing the transverse dimensions of the beam-affected region is discussed.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA41  
About • Received ※ 28 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 13 October 2021  
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MOPSA45 Experimental Simulation of Volume Repainting Technique at Proton Synchrotron in Context of Spot Scanning Proton Therapy target, radiation, proton, HOM 192
 
  • Belikhin, M.A. Belikhin, A.P. Chernyaev
    MSU, Moscow, Russia
  • A.A. Pryanichnikov, A.E. Shemyakov
    PhTC LPI RAS, Protvino, Russia
  
  Background: Reduction the influence of respiration-induced intrafractional motion of tissues is one of the main tasks of proton therapy with a scanning beam. Repainting is one of the techniques of motion compensation. It consists in multiple repeated irradiations of the entire volume or individual iso-energy layers with a dose that is a multiple of the prescribed dose. As a result, the dose is averaged, which leads to an increase in the uniformity of the dose field. Purpose: Experimental simulation of volume sequential repainting and dosimetric estimation of its capabilities in the context of spot scanning proton therapy (SSPT) using dynamic phantom. Materials and Methods: Simulation of respiration-like translational motion is performed using the non-anthropomorphic water dynamic phantom. Target of this phantom is compatible with EBT-3 films. Estimation of repainting technique is based on the analysis of average dose, dose uniformity in region of interests located within planning target volume, and dose gradients. Results: Repainting was estimated for motion with amplitudes of 2, 5, 10 mm with different number of iterations up to 10 at the prescribed dose of 6 Gy. This one increased the uniformity of the dose field from 85,9% to 96,0% at an amplitude of 10 mm and 10 iterations. Conclusions: Volume repainting improves the uniformity of dose distribution. However, the irradiation time increases, and the dose gradients deteriorate in proportion to the amplitude of motion.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA45  
About • Received ※ 28 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 16 October 2021
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MOPSA51 The Extraction System of DC140 Cyclotron cyclotron, extraction, emittance, permanent-magnet 213
 
  • V.I. Lisov, A.A. Protasov, A.S. Zabanov
    JINR/FLNR, Moscow region, Russia
  • K. Gikal, G.G. Gulbekyan, I.A. Ivanenko, G.N. Ivanov, I.V. Kalagin, N.Yu. Kazarinov, S.V. Mitrofanov, N.F. Osipov, V.A. Semin
    JINR, Dubna, Moscow Region, Russia
  
  The main activities of Flerov Laboratory of Nuclear Reactions, following its name - are related to fundamental science, but, in parallel, plenty of efforts are paid for practical applications. For the moment continues the works under creating irradiation facility based on the cyclotron DC140 which will be dedicated machine for applied researches in FLNR. The beam transport system will have three experimental beam lines for testing of electronic components (avionics and space electronics) for radiation hardness, for ion-implantation nanotechnology and for radiation materials science. The DC140 cyclotron is intended for acceleration of heavy ions with mass-to-charge ratio A/Z within interval from 5 to 8.25 up to two fixed energies 2.124 and 4.8 MeV per unit mass. The intensity of the accelerated ions will be about 1 pmcA for light ions (A<86) and about 0.1 pmcA for heavier ions (A>132). The following elements are used to extract the beam from the cyclotron: electrostatic deflector, focusing magnetic channel, Permanent Magnet Quadrupole lens and steering magnet. The design of the beam extraction system of DC140 cyclotron are presented in this report.  
poster icon Poster MOPSA51 [0.886 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA51  
About • Received ※ 30 August 2021 — Accepted ※ 20 September 2021 — Issued ※ 24 October 2021  
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MOPSA52 Modeling of the Magnetic System of the Cyclotron of Multicharged Ions cyclotron, acceleration, induction, light-ion 216
 
  • Yu.K. Osina, A.V. Galchuck, Yu.N. Gavrish, Yu.I. Stogov
    NIIEFA, St. Petersburg, Russia
  
  This paper presents the results of the calculation of the magnetic system of the cyclotron for accelerating of multicharged ions developed at NIIEFA JSC. The cyclotron complex is designed to generate ions with a mass-to-charge ratio in the range A/Z= 3/7, accelerate them to energies in the range of 7.5-15 MeV per nucleon. The cyclotron electromagnet has a four-sector structure, with a pole diameter of 4 m. Radial coils placed on the poles under the sectors are designed to adjust the magnetic field for providing isochronous acceleration conditions for different ions. A group of azimuthal coils designed to correct the first harmonic of the magnetic field and to center the orbits of the accelerated ion, as well as to ad-just the position of the axial symmetry plane of the magnetic field is located on the sectors. The required magnetic field topology for ion acceleration was formed in the induction range of 1.29-1.6 T. Calculations were per-formed for the 1/8 part of the electromagnet. A mode was chosen in which the dependence of induction on the radius, which provides isochronism, is realized due to the shape of "iron". For this mode with an induction in the center of 1.44 T, the shape of side plates, plugs, and sec-tor chamfers was determined. The currents in radial coils and the main dynamic characteristics of the cyclotron magnetic field for ion acceleration in the energy control range were calculated using the obtained magnetic field maps.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA52  
About • Received ※ 25 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 18 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, synchrotron, experiment 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, experiment, 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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TUB07 The Conceptual Design of the 7.5 MeV/u Light Ion Injector cavity, rfq, linac, 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 icon 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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TUC03 Development of Powerful Long-Pulse THz-Band FEL Driven by Linear Induction Accelerator FEL, electron, undulator, experiment 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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TUPSB12 Development of a Program Code for Calculation of Charged Particle Dynamics in RFQ rfq, acceleration, space-charge, quadrupole 256
 
  • A.S. Boriskov, A.M. Opekunov, L.E. Polyakov, N.V. Zavyalov
    RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia
  • M.L. Smetanin, A.V. Telnov
    VNIIEF, Sarov, Russia
  
  The calculation of charged particles dynamics is the initial stage in the development of an accelerator. The advancement of computer technology makes it possible to calculate particle dynamics using numerical methods with a required accuracy. During beam dynamics calculation it is necessary to take into account RF field force and self-induced Coulomb forces which also have an effect on charged particles. In this paper a model of «large particles» was chosen to simulate a space charge effect. To implement this model, a program code was written using parallel computing tools in the «C» programming language in the CUDA toolkit. The dynamics of ions with a ratio A / Z from 1 to 3.2 (A - the mass number, Z - the charge state of the ion) in the RFQ structure was calculated. The operating frequency of structure is 81.25 MHz, output energy is up to 820 keV / nucleon. Output beam characteristics (relative velocity, particle capture coefficient, beam profile, transverse emittances, longitudinal phase portrait) were determined. These results were verified by the BEAMDULAC-RFQ program*.
* Polozov S. M., Prob. of Atomic Sci. and Tech., 3 (79), 2012, pp. 131-136.
 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB12  
About • Received ※ 30 September 2021 — Revised ※ 01 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 14 October 2021
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TUPSB13 Charged Particle Dynamics Optimization in Discrete Systems controls, dynamic-aperture, collider, factory 259
 
  • E.D. Kotina, D.A. Ovsyannikov
    Saint Petersburg State University, Saint Petersburg, Russia
  
  Discrete optimization methods of dynamic systems are widely presented in the scientific literature. However, to solve various problems of beam dynamics optimization, it is necessary to create special optimization models that would take into account the specifics of the problems under study. The paper proposes a new mathematical model that includes the joint optimization of a selected (calculated) motion and an ensemble of perturbed motions. Functionals of a general form are considered, which makes it possible to estimate various characteristics of a charged particle beam and the dynamics of the calculated trajectory. The optimization of a bundle of smooth and nonsmooth functionals is investigated. These functionals estimate both the integral characteristics of the beam as a whole and various maximum deviations of the parameters of the particle beam. The variation of a bundle of functionals is given in an analytical form, which allows us to construct directed optimization methods. The selected trajectory can be taken, for example, as the trajectory of a synchronous particle or the center of gravity of a beam (closed orbit). We come to discrete models when we consider the dynamics of particles using a transfer matrices or transfer maps. Optimization problems can be of orbit correction, dynamic aperture optimization, and many other optimization problems in both cyclic and linear accelerators of charged particle beams.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB13  
About • Received ※ 16 September 2021 — Revised ※ 18 September 2021 — Accepted ※ 20 September 2021 — Issued ※ 22 October 2021
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TUPSB21 System for Correcting the Longitudinal Length of Electron Bunches for Generation a Free Electron Laser electron, wakefield, laser, dipole 271
 
  • A. Altmark, N.A. Lesiv, K. Mukhamedgaliev
    LETI, Saint-Petersburg, Russia
  
  The chicane is device for longitudinal compression of electron bunch for generation of coherent radiation in free electron laser. It is present a numerical simulation of beam dynamics passing through system which consist dielectric waveguide and four dipole magnets. The simulations made with use the modified Euler method based on Green function knowledge for cylindrical dielectric waveguide. We researched influence of various physical parameters of the electron bunch, as well as the chicane parameters on the change in the longitudinal bunch length. The optimal parameters of the focusing system were proposed for a relativistic particle beam with given initial bunch parameters. Recommendations for the selection of chicane parameters are also presented.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB21  
About • Received ※ 27 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 29 September 2021 — Issued ※ 21 October 2021
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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 gun, beam-loading, cathode, injection 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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WEPSC03 Multipactor Discharge in Short 5-Gap 80 MHz IH Structures multipactoring, electron, cavity, impedance 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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WEPSC06 Asess Input Data Uncertainties in Thermal-Mechanical Calculations of the Outlet Window Membrane of the LUE-200 Accelerator electron, neutron, operation, experiment 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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WEPSC07 Medium Energy Ions Transport Channel for a Pulsed Linear Accelerator MEBT, cavity, 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, beam-transport, cavity 361
 
  • S.M. Polozov, A.S. Panishev, V.L. Shatokhin
    MEPhI, Moscow, Russia
  
  The pumping features for the complex parts of the accelerator vacuum system are modeled to growth the efficiency of vacuum pumping. The vacuum system of a 7.5 MeV/nucleon proton and light ion (A/Z<3.2) accelerator-injector was considered. The Monte Carlo method is suitable for molecular flow modeling in high vacuum. The Molflow+ program was used for this aim. The pressure distribution simulation over the RFQ, IH resonators chambers volume, connecting vacuum pipes and extended vacuum tracts is carried out. The influence of parameters of individual structural elements changes was investigated to define the vacuum conditions inside the accelerators vacuum chambers. The vacuum system configuration and parameters are selected basing on these results to obtain the required vacuum level.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC10  
About • Received ※ 27 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 14 October 2021
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WEPSC15 Barrier Station RF1 of the NICA Collider. Design Features and Influence on Beam Dynamics collider, impedance, injection, space-charge 373
 
  • A.M. Malyshev, A.A. Krasnov, Ya.G. Kruchkov, S.A. Krutikhin, G.Y. Kurkin, A.Yu. Martynovsky, N.V. Mityanina, S.V. Motygin, A.A. Murasev, V.N. Osipov, V.M. Petrov, A.M. Pilan, E. Rotov, V.V. Tarnetsky, A.G. Tribendis, I.A. Zapryagaev, A.A. Zhukov
    BINP SB RAS, Novosibirsk, Russia
  • O.I. Brovko, I.N. Meshkov, E. Syresin
    JINR/VBLHEP, Moscow, Russia
  • I.N. Meshkov
    Saint Petersburg State University, Saint Petersburg, Russia
  • E. Rotov
    NSU, Novosibirsk, Russia
  • A.G. Tribendis
    NSTU, Novosibirsk, Russia
  
  This paper reports on the design features and con-struction progress of the barrier bucket RF systems for the NICA collider being built at JINR, Dubna. Each of two collider rings has three RF systems named RF1 to 3. RF1 is a barrier bucket system used for particles capturing and accumulation during injection, RF2 and 3 are resonant systems operating at 22nd and 66th harmonics of the revolution frequency and used for the 22 bunches formation. The RF systems are de-signed by Budker INP. Both RF1 stations were manu-factured, delivered to JINR and tested at the stand. The test results are presented in the article, as well as some results of calculating the effect of the RF1 system on the beam dynamics.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC15  
About • Received ※ 24 September 2021 — Revised ※ 26 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 18 October 2021
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WEPSC16 Numerical Research of Design Solutions for the Bending Magnets of the Electron Beam Facility GESA-1M electron, target, space-charge, site 376
 
  • N.I. Kazachenko, E.I. Gapionok, V.P. Kukhtin, I.Yu. Rodin, K.I. Tkachenko
    NIIEFA, St. Petersburg, Russia
  • D.A. Ovsyannikov, S.E. Sytchevsky
    Saint Petersburg State University, Saint Petersburg, Russia
  
  Comparative simulations of magnet configurations have been performed searching for the optimum design of bending magnets for the intense pulsed electron beam facility GESA-1M. GESA-1M is used for improvement of material surface properties and is capable to generate a 120 kV, 10 A/cm2, 50 mks electron beam with the diameter of 10 cm. One of specific concerns is to prevent the beam path from contamination withμparticles of treated materials. To overcome this problem a system of bending magnets is used. The beam trajectory through electric and magnetic fields was simulated for three candidate configurations of the bending magnets. A comparison was focused on the expected power density and divergence angle at the target. The most efficient concept was found to be two pairs of coils arranged orthogonally to each other. This configuration produces highly uniform distribution of the current density at the target, the divergence angle being as low as several degrees. An important advantage is that the initial beam power can be intensified by a 20% at the target.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC16  
About • Received ※ 28 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 19 October 2021
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WEPSC21 Light Ion Accelerator Magnets quadrupole, dipole, power-supply, operation 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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WEPSC36 Simulation of the Coherent Radiation Interferometry for the Beam Temporal Structure Diagnostics radiation, detector, electron, target 413
 
  • D.A. Shkitov, M. Shevelev, S. Stuchebrov, M. Toktaganova
    TPU, Tomsk, Russia
  
  Today, free electron lasers and new facilities that are capable of generating sequences of short electron bunches with a high (THz) repetition rate have widely developed. The existing diagnostic methods for such sequences have limitations or are not applicable. Therefore, it is important to develop new approaches to diagnose the temporal structure of such sequences (trains) in modern accelerators. In this report, we describe a model of coherent radiation interferometry using a Michelson interferometer. The mechanisms of transition and diffraction radiation are selected as the radiation source. The model takes into account the finite target size, the parameters of the sequence structure and the detector characteristics. The simulation results allow us to conclude that the analysis of the radiation intensity autocorrelation function itself can be applied as diagnostics method of an arbitrary bunch train temporal structure. Based on such method we can obtain information on the bunch number in the train and the distance between bunches.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC36  
About • Received ※ 24 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 13 October 2021
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WEPSC40 Detection of Anomalies in BPM Signals at the VEPP-4M ISOL, detector, experiment, optics 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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WEPSC44 Beam Loss Monitoring System for the SKIF Synchrotron Light Source storage-ring, operation, electron, diagnostics 426
 
  • Yu.I. Maltseva, A.D. Khilchenko, O.I. Meshkov, A.A. Morsina
    BINP SB RAS, Novosibirsk, Russia
  • S.V. Ivanenko, E.A. Puryga
    Budker Institute of Nuclear Physics, Novosibirsk, Russia
  • X.C. Ma
    BINP, Novosibirsk, Russia
  • Yu.I. Maltseva, O.I. Meshkov
    NSU, Novosibirsk, Russia
  • A.A. Morsina
    NSTU, Novosibirsk, Russia
  
  The Siberian ring source of photons (SKIF) is a new 3 GeV fourth-generation synchrotron light source being developed by the Budker Institute of Nuclear Physics (BINP). In order to ensure its reliable operation, beam loss diagnostics system is required. Two types of beam loss monitors will be installed at the SKIF: 5 fiber-based Cherenkov Beam Loss Monitors (CBLM) for the linac and transfer lines and 128 Scintillator-based Beam Loss Monitors (SBLM) for the storage ring. Sophisticated electronic equipment are employed to use these monitors at different SKIF operating modes. The article describes the design of the SKIF beam loss diagnostics system based on numerical simulations and experimental studies.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC44  
About • Received ※ 08 October 2021 — Accepted ※ 09 October 2021 — Issued ※ 18 October 2021  
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WEPSC50 Enhancement of Transverse Beam Phase Space Analysis by Tomography Method at INR Linac emittance, linac, quadrupole, cavity 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 icon 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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FRA03 Simulation and Design of the Permanent Magnet Multipole for DC140 dipole, factory, permanent-magnet, focusing 99
 
  • V.P. Kukhtin, A.A. Firsov, M. Kaparkova, E.A. Lamzin, M.S. Larionov, A. Makarov, A. Nezhentzev, I.Yu. Rodin, N. Shatil
    NIIEFA, St. Petersburg, Russia
  • N.S. Edamenko, D.A. Ovsyannikov
    St. Petersburg State University, St. Petersburg, Russia
  • G.G. Gulbekyan, I.A. Ivanenko, I.V. Kalagin, N.Yu. Kazarinov, N.F. Osipov
    JINR, Dubna, Moscow Region, Russia
  • S.E. Sytchevsky
    Saint Petersburg State University, Saint Petersburg, Russia
  
  Permanent magnet (PM) multipoles in some cases are good candidates in accelerator applications for beam transportation and focusing. The PM quadrupole will be utilized in the DC140 cyclotron which is under construction in JINR. A passive magnetic channel and a PM quad will be used for the compensation of horizontal defocusing in the high and low field regions, respectively. The quad is designed as a set of identical PMs rigidly fixed in a non-magnetic housing and capable to generate a a 8.1 T/m gradient field in the 64x25 mm aperture and 29.926 cm effective length. The error of linear approximation should be 1% or less. A special study was accomplished to define the PM specification reasoning from the demand for desired field strength, simple geometry, minimized nomenclature, and commercial availability. The quad design was selected with the use a 2D analytical model and then optimized in iterative 3D FE simulations with realistic PM shape and magnetic characteristics in mind. The resultant concept is the quad formed with 6 coaxial sections each 5cm in width. Every section has 26 identical PM bricks with the dimensions 11mmx11mmx50mm and different orientations. The PM bricks have remanent induction of 1.185 T and magnetic susceptibility of 0.1. Temperature characteristics and expected lifetime were also analysed. From the results obtained, candidate PM materials were proposed and mechanical and magnetic precision were recommended.  
slides icon Slides FRA03 [1.465 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRA03  
About • Received ※ 09 September 2021 — Accepted ※ 29 September 2021 — Issued ※ 12 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, experiment, 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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