Keyword: ECR
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MOPSA48 Simulation of the Electrostatic Deflector of DC140 Cyclotron septum, cyclotron, beam-losses, extraction 202
 
  • A.S. Zabanov, V.I. Lisov
    JINR/FLNR, Moscow region, Russia
  • K. Gikal, G.G. Gulbekyan, I.V. Kalagin, N.Yu. Kazarinov, S.V. Mitrofanov, 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 a lot of efforts are paid for practical applications. Currently, work is underway to create an irradiation facility based on the DC140 cyclotron for applied research at 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 to accelerate 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 extraction system based on four main elements - electrostatic deflector, focusing magnetic channel, Permanent Magnet Quadrupole lens and steering magnet. The results of numerical simulation of the electrostatic deflector of DC140 cyclotron are presented in this this paper.  
poster icon Poster MOPSA48 [1.255 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA48  
About • Received ※ 22 August 2021 — Accepted ※ 20 September 2021 — Issued ※ 09 October 2021  
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MOPSA50 Axial Injection System of DC140 Cyclotron of FLNR JINR cyclotron, injection, radiation, solenoid 209
 
  • N.Yu. Kazarinov, V. Bekhterev, G.G. Gulbekyan, I.A. Ivanenko, I.V. Kalagin, S.V. Mitrofanov, N.F. Osipov, V.A. Semin
    JINR, Dubna, Moscow Region, Russia
  • V.I. Lisov
    JINR/FLNR, Moscow region, Russia
 
  Flerov Laboratory of Nuclear Reaction of Joint Institute for Nuclear Research continues the works under creating of FLNR JINR Irradiation Facility based on the cyclotron DC140. The facility will have three experimental beam lines for SEE testing of microchips, for production of track membranes and for solving of applied physics problems. The injection into cyclotron will be realized from the external room temperature 18 GHz ECR ion source. The systems of DC140 cyclotron such as axial injection, main magnet, RF- and extraction systems and beam lines are the reconstruction of the DC72 cyclotron ones. The acceleration in DC140 cyclotron is carried out for two values of harmonic number h = 2,3 of heavy ions with mass-to-charge ratio A/Z within two intervals 5 - 5.5 and 7.5 - 8.25 up to two fixed energies 2.124 and 4.8 MeV per unit mass, correspondingly. 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 design of the axial injection system of the DC140 cyclotron is presented in this report.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA50  
About • Received ※ 27 August 2021 — Revised ※ 07 September 2021 — Accepted ※ 10 September 2021 — Issued ※ 23 October 2021
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MOPSA53 Focusing Properties of the Magnetic Structure of Isochronous Cyclotrons With Large Spiraling Angle of Pole Tips focusing, cyclotron, factory, H-minus 219
 
  • D.A. Amerkanov, S.A. Artamonov, E.M. Ivanov, G.A. Riabov, V.A. Tonkikh
    PNPI, Gatchina, Leningrad District, Russia
 
  Magnetic structures with a high spiraling angle of pole tips are used in superconducting cyclotrons, H⁻ ion cyclotrons, etc. and they have been investigated in a number of works. In connection with the design of an 80 MeV isochronous H⁻ cyclotron, such studies were continued and extended. The paper proposes a relatively simple approach for analyzing the projected spiral structure. The main conclusions can be formulated as follows. The introduction of spiraling makes it possible to significantly increase the vertical focusing, but in the central region at radii smaller than the gap in the hills, the structure with high spiraling angle becomes ineffective and can lead to a decrease in focusing. Each radius can be associated with a limiting spirality angle, above which spiraling leads to a resultant decrease in vertical focusing. The spiraling of the magnetic field does not coincide with the geometric spiraling of the pole tips, which should be taken into account when designing the cyclotron structure. The developed technique can be useful for a quick analysis of various options and will reduce the amount of time-consuming calculations by using 3D programs.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA53  
About • Received ※ 07 September 2021 — Accepted ※ 10 September 2021 — Issued ※ 15 October 2021  
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TUX01 Status of the HIAF Accelerator Facility in China injection, linac, cavity, vacuum 23
 
  • J.C. Yang, D.Q. Gao, Y. He, L.J. Mao, G.D. Shen, L.N. Sheng, L.T. Sun, Z. Xu, Y.Q. Yang, Y.J. Yuan
    IMP/CAS, Lanzhou, People’s Republic of China
 
  The High Intensity heavy-ion Accelerator Facility (HIAF) is under constructed at IMP in China. The HIAF main feature is rapid acceleration of ions in the booster synchrotron ring (BRing) with the ramping rate up to 12 T/s. The challenges are related to the systems RF cavities, dipole power supplies, vacuum etc. Works on key prototypes of the HIAF machine are ongoing at IMP. In this paper, the test results of the power supplies, RF cavities and vacuum chambers are presented. As the construction of the HIAF facility has started, an overview of the hardware developments will also be reported.  
slides icon Slides TUX01 [17.099 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUX01  
About • Received ※ 13 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 20 October 2021
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TUPSB17 Investigations of Charge Particle Dynamics in Space Charge Fields space-charge, gun, site, experiment 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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TUPSB20 Selection of a System for Correcting the Energy Spread of Relativistic Electron Bunches for a Free Electron Laser GUI, electron, wakefield, radiation 268
 
  • A. Altmark, N.A. Lesiv, K. Mukhamedgaliev
    LETI, Saint-Petersburg, Russia
 
  The object of this work is a device called dechirper, which is used to decrease energy spread in relativistic electron bunch for free electron laser application. This system is based on cylindrical dielectric waveguide with vacuum channel needed for electron bunch passing. The Vavilov-Cherenkov radiation excited in waveguide is used to profile electromagnetic field inside the bunch and as a consequence to achieve the required energy distribution. The work includes numerical modeling of the electron beam passage through a waveguide structure, the generation of wake radiation and the interaction of this radiation with an electron bunch. We made original code to carry out numerical modeling, where the method of macroparticles and the method of Green’s function are implemented. The dependences of the energy compression coefficient and the length at which the maximum energy compression coefficient is achieved on various parameters of the dielectric waveguide structure and the physical parameters of electron bunches were identified. Various recommendations were also made on the choice of a waveguide used as a dechirper.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB20  
About • Received ※ 27 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 29 September 2021 — Issued ※ 08 October 2021
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TUPSB35 3D Simulation Study and Optimization of Magnetic System of DECRIS Ion Source with the Pumping Frequency 28 GHz solenoid, sextupole, ion-source, operation 300
 
  • V.M. Amoskov, E.I. Gapionok, V.P. Kukhtin, A.N. Labusov, E.A. Lamzin, A. Makarov, I.Yu. Rodin, A.V. Safonov, N. Shatil, D.B. Stepanov, E.R. Zapretilina
    NIIEFA, St. Petersburg, Russia
  • S.L. Bogomolov, A.A. Efremov
    JINR, Dubna, Moscow Region, Russia
  • S.E. Sytchevsky
    Saint Petersburg State University, Saint Petersburg, Russia
 
  A superconducting magnet system for a 28 GHz ECR ion source DECRIS-SC2 was studied in order to select its parameters and optimize performance. Parametric magnetic models were performed for two design configurations, conventional ("sextupole-in-solenoid") and reversed ("solenoid-in-sextupole"). In the "sextupole-in-solenoid" design the racetrack coils of the sextupole magnet used for radial plasma confinement are located inside the solenoids producing the axial field. In the "solenoid-in-sextupole" design the coils arrangement is reversed. For both configurations, electromagnetic effect the booster and the steel poles on the magnet performance was investigated from the point of view critical parameters of the system ¿ currents, fields, and forces. Results of the parametric computations were used to optimize the geometry and sizes of the magnet as well as the magnetic shield, the booster, and the poles. For better reliability and validation of the result, computations were performed with two magnetostatic codes, KOMPOT and KLONDIKE, utilizing the differential and integral formulations, respectively. A comparison of the obtained parameters was used to select the candidate magnet configuration for further design and manufacture.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB35  
About • Received ※ 28 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 04 October 2021 — Issued ※ 18 October 2021
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TUPSB36 High Intensity Calcium, Chromium and Titanium Ion Beams from the Permanent Magnet ECR Ion Source DECRIS-PM cyclotron, ion-source, experiment, 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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TUPSB37 Modernization of the ECR Ion Source DECRIS-2M. Results of the First Tests. ECRIS, ion-source, plasma, injection 307
 
  • A.E. Bondarchenko, S.L. Bogomolov, A.A. Efremov, V.N. Loginov, V. Mironov, D.K. Pugachev
    JINR, Dubna, Moscow Region, Russia
 
  The article describes the design of the modernized ECR ion source DECRIS-2M. The upgrade consists in increasing the magnetic field to improve plasma confinement and improve the source parameters. The modernization also made it possible to increase the inner diameter of the plasma chamber and replace the coaxial microwave power input by a waveguide. Redesigned injection chamber significantly expands the possibilities of production ions of solids using different methods. The article also presents the first results of experiments production of Ar, Xe and Bi ion beams from a modernized ion source. The results demonstrate substantial increase of the ion beams intensity.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB37  
About • Received ※ 06 September 2021 — Revised ※ 21 September 2021 — Accepted ※ 23 September 2021 — Issued ※ 18 October 2021
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TUPSB38 Magnetic System With Variable Characteristics for a 2.45 GHz ECRIS plasma, solenoid, ion-source, operation 310
 
  • M.S. Dmitriyev, K.G. Artamonov, O.A. Ivanov, M.I. Zhigailova
    MEPhI, Moscow, Russia
 
  Particle sources might be considered as an incredibly significant part of the accelerator system. Nowadays high-energy acceleration requires the types of ion sources implemented to produce beams of ions and protons of high energy and intensity. The current study is aimed to con-sider the design of the magnetic system of ECRIS with the operating frequency of 2.45 GHz for producing pro-tons and double-charged helium ions. The numerical simulation of the magnetic system was made by the Finite Element Method. The adjustment of the axial distribution of the magnetic field inside the plasma chamber is realized by shifting the ring magnets. Additional tuning of the axial magnetic field is presented by solenoids introduced for providing the required Binj and Bext adjustment as well as the Bmin control on the axis. For the simplification of the structure the alternating design of the ring magnets with trapezoidal components was considered. Furthermore, the magnetic system allows operating in both single-charged and multiply charged ions generation modes, thus the microwave source mode and the ECR mode are realizable for this configuration. Therefore, the study enables a better understanding of the feasibility of the ECRIS magnetic system with variable characteristics.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB38  
About • Received ※ 29 September 2021 — Revised ※ 30 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 19 October 2021
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WEPSC01 Unit for Matching a Driving Waveguide With a Cavity cavity, GUI, coupling, Windows 340
 
  • V.V. Paramonov
    RAS/INR, Moscow, Russia
 
  To match the driving waveguide, usually operating in the fundamental TE10 wave, with the accelerating structure, a device is required that performs the function of a wave-type transformer. In the microwave region, transforming devices with matching windows are usually used, the field distribution in which can also be described as TE-type. At the ends of the window from the side of the structure, regions with an increased density of Surface Currents (SC) inevitably arise, leading to an increase in the surface temperature in a place that is difficult to access for cooling. There are various solutions for matching windows, in order to reduce the maximum SC from the side of the structure , briefly mentioned in the report. A solution based on the dispersion properties of the waveguide and providing a significant additional decrease in the SC density is considered. This solution can be implemented in devices for S and lower frequency ranges.  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC01  
About • Received ※ 06 September 2021 — Revised ※ 20 September 2021 — Accepted ※ 24 September 2021 — Issued ※ 22 October 2021
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FRA01 Peculiarities of Producing 48Ca, 48Ti, 52Cr Beams at the DC-280 Cyclotron cyclotron, experiment, 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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