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plasma

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TUPSA020 Development of Injector for ITEP Heavy Ion Synchrotron Based on Laser Plasma Generator laser, ion, target, heavy-ion 86
 
  • Yu. A. Satov, N. N. Alexeev, A. Balabaev, A. D. Belokurov, I. D. Hrisanov, B. Y. Sharkov, A. Shumshurov, A. A. Vasilyev
    ITEP, Moscow
  A schematic diagram of heavy ion injector based on laser ion sources is described. Two different basic laser configurations used in ITEP synchrotron. First laser excels in simplicity and consists of CO2 free-running laser that is applied for carbon target plasma heating and ionization at laser power density q=3·1012W/cm2 to create high current C4+ ion beam. Second master oscillator-amplifier (MOPA) laser configuration intends for production super high laser intensity at a target to provide considerable charge state in a plasma of heavy elements (Al, Fe, Ag etc). This laser configuration is founded on original physical principle* that simplifies the installation and ensures high reliability for long term operation. Laser characteristics for the different laser scheme and ion current for injector outlet beam of C4+ and Ag+19 are shown in this paper. The latter was accelerated in synchrotron for energy up to 100 MeV/u.

* K. N. Makarov et al. Quantum Electronics (Russian), 2001, 31 (1), pp. 23-29

 
 
WEPSB015 Simulation of Carbon Ion Extraction and Low Energy Beam Transport System for RFQ at the Linac I-100 ion, rfq, extraction, emittance 201
 
  • B. A. Frolov
    IHEP Protvino, Protvino, Moscow Region
  For the carbon ion injection into the radio frequency quadrupole, a laser ion source and a low energy beam transport system (LEBT) has to deliver 20 mA C+5 ion beam with 80 keV at the entrance of RFQ within normalized emittance of 0.4Pi mm mrad. An extraction system and a low energy transport line should be optimized to reduce the beam emittance as far as possible. The results of computer simulation are presented for extraction and LEBT systems: combinations of a tetrode extraction system and an electrostatic focusing lens consisting of three electrodes with negative voltage of a middle grid electrode.  
 
THCHA01 The Nonlinear Transformation of a Ions Beam in the Plasma Lens ion, focusing, target, luminosity 280
 
  • A. A. Drozdovsky, N. N. Alexeev, S. A. Drozdovsky, A. Golubev, Yu. B. Novozhilov, P. V. Sasorov, V. V. Yanenko
    ITEP, Moscow
  The focusing capabilities of a plasma lens depend on the stage of plasma development. Under certain conditions a magnetic field is linear, that allow to focus the beam to a very small spot. In other conditions, the magnetic field is nonlinear, that allow formation of hollow and others beam structures. The work deals with the study of the last type of a plasma lens. Calculations and measurements were performed for a C+6 and Fe+26 beams of 200 MeV/a.u.m. energy. The obtained results and analysis are reported.  
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THCHB01 Study of INR RAS Linac Pulsed Duoplasmatron ion, extraction, emittance, ion-source 289
 
  • A. Belov, O. T. Frolov, E. S. Nikulin, V. P. Yakushev
    RAS/INR, Moscow
  • V. Zubets
    BNL, Upton, Long Island, New York
  Results of numerical simulation and experimental study of hydrogen ion beam from a pulsed duoplasmatron with different plasma expansion cap geometry are given. Intensive beam current oscillations with frequency of ~1MHz and up to 70% modulation level (for ion current ~ 100 mA) with plasma expansion cap of different shape were observed. It has been found by direct measurements that these oscillations are formed during plasma transport through the expansion cap. Noiseless mode of operation for the pulsed duoplasmatron has been obtained with the plasma expansion cap of new design. Results of the 400keV hydrogen ion beam current and emittance measurements are presented.