Keyword: acceleration
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S11LLC07 The KEK PS Fast Beam Loss Monitor System detector, hardware, controls, booster 395
 
  • J.A. Holt, D.A. Arakawa, S. Hiramatsu, J. Kishiro, H. Someya
    KEK, Ibaraki, Japan
  • J.A. Holt
    Fermilab, Batavia, Illinois, USA
  
  The higher beam in­ten­si­ties now being ac­cel­er­ated in the KEK pro­ton syn­chro­tron (PS) com­plex have in­creased the im­por­tance of ob­serv­ing the beam loss dur­ing ac­cel­er­a­tion. The beam loss should be con­tin­u­ously mon­i­tored to min­i­mize ra­di­a­tion dam­age to the ac­cel­er­a­tor com­po­nents. A fast loss mon­i­tor also is a good tool for ob­serv­ing where and when the beam is lost, by which we are able to get in­for­ma­tion on the beam dy­nam­ics. The de­vel­op­ment of a fast beam loss mon­i­tor sys­tem at KEK is de­scribed in this paper.  
DOI • reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S11LLC07  
About • Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992  
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S11LLC08 Non-Destructive Fast Data Taking System of Beam Profile and Momentum Spread in KEK-PS synchrotron, electron, vacuum, injection 399
 
  • T. Kawakubo, T. Adachi, Y. Ajima, E. Kadokura
    KEK, Ibaraki, Japan
  • T. Ishida
    Mitsubishi Electric Corporation, Tokyo, Japan
  
  A moun­tain view of beam pro­files in a syn­chro­tron ring can be taken with­out any beam de­struc­tion by col­lect­ing charged par­ti­cles pro­duced by the cir­cu­lat­ing beam hit­ting resid­ual gas in the ring to a sen­sor. When a rec­tan­gu­lar Micro Chan­nel Plate with multi-an­odes or lined-up elec­tron mul­ti­pli­ers is used as the sen­sor, the pro­files can be mea­sured within one ac­cel­er­a­tion pe­riod, even if the beam in­ten­sity is very low and the ring is kept in a high vac­uum. We de­scribe this non-de­struc­tive pro­file mon­i­tor (NDPM) as well as the mo­men­tum spread mea­sure­ment sys­tem by a com­bi­na­tion of two sets of NDPM.  
DOI • reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S11LLC08  
About • Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992  
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S12FC07 RF Control System of the HIMAC Synchrotron controls, synchrotron, feedback, electron 434
 
  • M. Kanazawa, Y. Hirao, A.I. Itano, K. Noda, K. Sato, M. Sudou, E. Takada
    NIRS, Chiba-shi, Japan
  • Y. Morii, M. Shigeta, E. Toyoda, N. Tsuzuki, T. Yagi, T. Yamagishi, C. Yamazaki
    Toshiba Corporation, Tokyo, Japan
  
  HIMAC is a heavy Ion ac­cel­er­a­tor fa­cil­ity ded­i­cated to the med­ical use, es­pe­cially for the clin­i­cal treat­ment of tu­mors. The ion species re­quired for the clin­i­cal treat­ment range from 4He to 40Ar. An RF con­trol sys­tem of the HIMAC syn­chro­tron has been con­structed. In this con­trol sys­tem we have adopted a dig­i­tal feed back sys­tem with a dig­i­tal syn­the­sizer (DS). Com­bin­ing a high power sys­tem, per­for­mance of the con­trol sys­tem have been tested in a fac­tory (Toshiba) with a sim­u­la­tor cir­cuit of the syn­chro­tron os­cil­la­tion. Fol­low­ing this test, we had beam ac­cel­er­a­tion test with this con­trol sys­tem at TARN-II in INS (In­sti­tute for Nu­clear Study, Uni­ver­sity of Tokyo). This paper de­scribes the RF con­trol sys­tem and its tested re­sults.  
DOI • reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S12FC07  
About • Received ※ 02 December 1991 — Accepted ※ 02 January 1992 — Issued ※ 04 December 1992  
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