Keyword: permanent-magnet
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MOPSA51 The Extraction System of DC140 Cyclotron cyclotron, extraction, emittance, simulation 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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FRA03 Simulation and Design of the Permanent Magnet Multipole for DC140 simulation, dipole, factory, 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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FRB03 Upgrated the Extraction Device of Focused Electron Beam Into the Atmosphere electron, focusing, extraction, cathode 114
 
  • E.V. Domarov, I. Chakin, V.G. Cherepkov, S. Fadeev, M. Golkovsky, Yu.I. Golubenko, A.I. Korchagin, N.K. Kuksanov, A. Lavrukhin, P.I. Nemytov, R.A. Salimov, A.V. Semenov
    BINP SB RAS, Novosibirsk, Russia
 
  For over 30 years, an extraction device has been successfully working in BINP at the ELV-6 accelerator to extract a focused beam of electrons into the atmosphere. The accelerating tube with permanent magnetic lenses was used in this installation. The design of these accelerator tubes with magnetic lenses is rather complicated. Recently, simpler design and high reliability accelerating tubes with big aperture is operating in ELV accelerators. For this reason, the problem number one at present is to develop the extraction device, capable of reliably working with serial accelerator tubes, of the ELV accelerator with power up to100 kW. The lens L1 is located directly at the lower end of the accelerating tube. Passing the lens L1, the beam is focused near the diaphragm D6 and increases to a diameter of 10 mm in the diaphragm D5. For passing the beam along the axis of the diaphragms, there are corrections coils C1 C2 C3. The diameter of diaphragm hole D1 is the most critical, because it determines the flow of gas that should be pumped out in the following steps of the vacuum system. Measurements of the parameters of a high-power electron beam were carried out up to a power of 100 kW. As a result of the made experiments the minimum diameter of the beam at the exit from the extractions device has been 2 mm at the energy of 1,4 MeV and the beam current of 60 mA.  
slides icon Slides FRB03 [2.785 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRB03  
About • Received ※ 02 September 2021 — Revised ※ 15 September 2021 — Accepted ※ 23 September 2021 — Issued ※ 19 October 2021
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