Author: Goto, A.
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MOPA08 The Multi Particle Simulation for the Cyclotron NIRS-930 51
 
  • M. Nakao, S. Hojo, K. Katagiri, A. Noda, K. Noda, A. Sugiura, T. Wakui
    NIRS, Chiba-shi, Japan
  • A. Goto
    Yamagata University, Yamagata, Japan
  • V.L. Smirnov, S.B. Vorozhtsov
    JINR, Dubna, Moscow Region, Russia
  
  The simulation of the beam for the cyclotron NIRS-930 at NIRS has been performed with the use of the SNOP program* in order to study beam dynamics in a cyclotron and to improve beam intensity. SNOP simulated from beam injection to extraction with the electric fields of the inflector, the Dee electrodes and the deflector; the magnetic fields of the main coils, the trim coils and the harmonic coils and the magnetic channel which were calculated by OPERA-3d. The simulation of proton with 30 MeV extraction energy with harmonic number of 1 was already performed and well simulated RF phase and extraction efficiency**. Then we tried to apply SNOP to 18 MeV protons with harmonic 2. We first formed isochronous magnetic field with main and trim coils for simulating single particle. Next we optimized electric deflector and magnetic channel in order to maximize extraction efficiency simulating the bunch of particles. Beam loss of the simulation was compared to the experiment. We intend to apply optimized simulation parameters for actual cyclotron operation to improve beam intensity and quality.
* V.L. Smirnov, S.B. Vorozhtsov, Proc. of RUPAC2012 TUPPB008 325 (2012)
** V.L. Smirnov et al., Proc. of IPAC2012 292 (2012)
 		 
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MOPA10 Development of Low-Energy Heavy-Ion Beams by the RIKEN AVF Cyclotron and Hyper ECR Ion Source of CNS 58
 
  • Y. Kotaka, N. Imai, H. Muto, Y. Ohshiro, S. Shimoura, S.-I. Watanabe, H. Yamaguchi
    CNS, Saitama, Japan
  • A. Goto
    Yamagata University, Yamagata, Japan
  • K. Hatanaka
    RCNP, Osaka, Japan
  • M. Kase, S. Kubono
    RIKEN Nishina Center, Wako, Japan
  
  The application of low-energy heavy-ion beams enhances production of radioisotope (RI) and studies of nuclear astrophysics.　The Center for Nuclear Study (CNS) of the University of Tokyo and RIKEN Nishina Center have been developing the RIKEN AVF Cyclotron (AVF) and the Hyper ECR Ion Source (IS) of CNS to expand available ions and their acceleration energies as well as to increase the beam intensity for studies at the low-energy RI beam separator CRIB * and others. Renovation of central region of the AVF expands the acceptance of injection beam, so that 4He beam is now available at a higher energy of 12.5MeV/u under the constraint that the maximal Dee voltage is 50kV. Intensities of metallic ions extracted from the IS have been increased by developing three kinds of vaporization methods, multi-hole micro-oven, non-axial rod and MIVOC. Plasma spectroscopy ** is applied to monitor the intensities of highly charged ions in the IS. For systematic study of transport efficiencies, several beam diagnostic devices have been added. One key device is a set of a multi-hole slit and a viewer of the beam image (pepper-pot emittance monitor ***), which gives four-dimensional phase space.
* Y. Yanagisawa et al., Nucl. Instr. and Meth. Phys. Res. A539 (2005) 74
** H. Muto et al., Rev. Sci. Instr. 85 (2014) 02A905
*** T. Hoffmann et al., Proc. 9th BIW2000, Cambridge, USA, PP.432-439
 		 
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