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Shibuya, S.

Paper Title Page
MOPC004 Dynamics of a High Density Ion-Beam with Electron Cooling in HIMAC Synchrotron 416
 
  • T. Uesugi, T. Fujisawa, K. Noda, D. Tann
    NIRS, Chiba-shi
  • Y. Hashimoto
    KEK, Ibaraki
  • I.N. Meshkov, E. Syresin
    JINR, Dubna, Moscow Region
  • S. Ninomiya
    RCNP, Osaka
  • S. Shibuya, H. Uchiyama
    AEC, Chiba
 
  High density circulating-ion beam was obtained with electron-cooling and cool-stacking injection in HIMAC synchrotron. The ion density was saturated at 1.0e9/cm2. Coherent transverse instability was observed when ion- and electron-beam density was high. The dynamics of the cooled ion-beam are described in this report.  
TPPE031 60 mA Carbon Beam Acceleration with DPIS 2206
 
  • M. Okamura, R.A. Jameson, K. Sakakibara, J. Takano
    RIKEN, Saitama
  • T. Fujimoto, S. Shibuya, T. Takeuchi
    AEC, Chiba
  • Y. Iwata, K. Yamamoto
    NIRS, Chiba-shi
  • H. Kashiwagi
    JAERI/ARTC, Gunma-ken
  • A. Schempp
    IAP, Frankfurt-am-Main
 
  We have studied "direct plasma injection scheme (DPIS)" since 2000. This new scheme is for producing very intense heavy ions using a combination of an RFQ and a laser ion source. An induced laser plasma goes directly into the RFQ without an extraction electrode nor any focusing devices. Obtained maximum peak current of Carbon 4+ beam reached 60 mA with this extremely simple configuration. The details of the experimental result will be presented.  
FPAE004 Optical Matching of Slowly Extracted Beam with Transport System at HIMAC 910
 
  • T. Furukawa, K. Noda, E. Takada, M. Torikoshi, T.H. Uesugi, S. Yamada
    NIRS, Chiba-shi
  • T. Fujimoto, M. Katsumata, S. Shibuya, T. Shiraishi
    AEC, Chiba
 
  The optical matching between the ring and the transport line plays important role in order to control the beam size and profile after the transport. At HIMAC, thus, we have studied the optical matching of the slowly extracted beam. As a result, it was verified that the beam size of the slowly extracted beam were controlled owing to the optical matching. It was also found that small deviation of quadrupole strength in the ring brings orbit distortion at the transport system.  
RPPE040 Development of Copper Coated Chamber for Third Generation Light Sources 2633
 
  • H. Sakai, I. Ito, H. Kudo, N. Nakamura, S. Shibuya, K. Shinoe, H. Takaki
    ISSP/SRL, Chiba
  • K. Kobayashi
    KEK, Ibaraki
 
  For the 3rd generation light sources, it is essential to reduce the beam instability in order to produce the highly bright synchrotron light much stably. Especially, to avoid the coupled bunch instability, the resistive wall impedance must be reduced. The copper-coating inner surface of the chamber(especially in insertion device section)is much effective method for the reduction of the resistive wall impedance, whose method was already proposed by our group (N.Nakamura et.al., EPAC 1998 p984). We have already produced the copper coated chamber. In this paper, we describe the measurement of the outgassing from the copper coated chamber to evaluate if this chamber is valid on the ultra-low high vacuum condition.  
FPAE005 Characteristics of Injected Beam at HIMAC Synchrotron 952
 
  • T.H. Uesugi, T. Furukawa, K. Noda, S. Shibuya
    NIRS, Chiba-shi
 
  At the HIMAC synchrotron, we have carried out the tune survey with the lifetime measurement in order to obtain the high intensity. Under the relatively high intensity, it was observed that a part of the circulating beam was lost due to the coherent oscillation in both the horizontal and the vertical direction. Taking account of the tune shift and spreads, the working point was optimized so as to avoid resonance line. We will describe the experimental result.