Author: Hojo, S.
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MOPRI080 Measurement of Beam Phase using Phase Probe at the NIRS-930 Cyclotron 794
 
  • S. Hojo, K. Katagiri, M. Nakao, A. Noda, K. Noda, A. Sugiura
    NIRS, Chiba-shi, Japan
  • T. Honma, A.K. Komiyama, T. Okada, Y. Takahashi
    AEC, Chiba, Japan
 
  The NIRS-930 cyclotron of the National Institute of Radiological Sciences (NIRS) has been used for production of short-lived radio-pharmaceuticals for PET, research of physics, developments of particle detectors in space, and so on. The NIRS-930 has twelve trim coils for generation of the isochronous fields. Until recently, currents of the twelve trim coils had been adjusted only by monitoring the beam intensity. In order to exactly produce the isochronous fields, a phase probe has been installed in the NIRS-930. Recent results of beam tests using the phase probe will be presented in the present work.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI080  
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MOPRI081 Beam Simulation for Improved Operation of Cyclotron NIRS-930 797
 
  • M. Nakao, S. Hojo, K. Katagiri, A. Noda, K. Noda, A. Sugiura
    NIRS, Chiba-shi, Japan
  • A. Goto
    Yamagata University, Yamagata, Japan
  • T. Honma, A.K. Komiyama, T. Okada, Y. Takahashi
    AEC, Chiba, Japan
  • V.L. Smirnov, S.B. Vorozhtsov
    JINR, Dubna, Moscow Region, Russia
 
  Beam simulation using SNOP* code has been performed for the cyclotron NIRS-930 at NIRS in order to study beam dynamics in a cyclotron and to improve beam intensity. Each electric or magnetic field (main coil, trim coils, harmonic coils, magnetic channel, gradient corrector, grazer lens, dee electrode, inflector) were calculated by OPERA-3d, and simulated injection, acceleration, and extraction. The simulation of proton with 30 MeV extracting energy with harmonic 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 extracted particles simulating the bunch of particles. Beam loss of the simulation was compared to the experiment. And then we are optimizing position and rotation of inflector and position of puller to improve injection. We intend to apply optimized simulation parameter to 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)
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI081  
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WEPRO088 Design of Beam Transport Lines for Radioisotope Production Systems in NIRS Cyclotron Facility 2162
 
  • K. Katagiri, S. Hojo, M. Nakao, A. Noda, K. Noda, A. Sugiura, K. Suzuki
    NIRS, Chiba-shi, Japan
 
  A new beam transport and a irradiation system were designed for radionuclides production with heat damageable targets. The incident beam is swept along a circle on the irradiation target with fast steering magnets. The width and the sweeping radius of the incident beams were optimized to achieve high production efficiency and avoid the heat damages. Based on those optimized parameters, beam optics of the new beam transport lines was optimized. To obtain initial conditions for the optical calculations, the beam emittance and the Twiss parameters were measured at the upper stream of the new beam transport lines. In this paper, we present the results of the calculations and the optimized beam transport lines.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO088  
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