Author: Tobiyama, M.
Paper Title Page
TUP002 Development of Bunch Position Monitors to Observe Sudden Beam Loss of SuperKEKB Rings 179
 
  • M. Tobiyama, H. Ikeda, G. Mitsuka
    KEK, Ibaraki, Japan
  
  In the Su­perKEKB rings, we have en­coun­tered ex­tremely-fast beam losses oc­cur­ring pri­mar­ily within one to two turns in some parts of the bunch train. Such ¿sud­den beam loss¿ in­duced se­vere fail­ure in the ver­ti­cal col­li­ma­tor heads, quenches on the su­per­con­duct­ing final quadrupoles, and dam­age on the Belle II de­tec­tor in some cases. Thus it is es­sen­tial to in­ves­ti­gate the cause and take coun­ter­mea­sures. This paper pre­sents the phe­nom­ena clar­i­fied by the bunch cur­rent and po­si­tion mon­i­tor of the bunch feed­back sys­tem. The up­grade plan for the ex­ist­ing mon­i­tor, and re­cently de­vel­oped sim­ple mon­i­tors in­stalled in the sus­pected area is also in­tro­duced.  
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DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP002  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023
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