Author: Telada, S.
Paper Title Page
WEPME016 Recent Progress of a Laser-based Alignment System at the KEKB Injector Linac 2959
 
  • T. Suwada, M. Satoh
    KEK, Ibaraki, Japan
  • K. Minoshima, S. Telada
    AIST, Tsukuba, Japan
  
  A new laser-based align­ment sys­tem is under de­vel­op­ment in order to pre­cisely align ac­cel­er­a­tor com­po­nents with a pre­ci­sion level of ±0.1 mm along an ideal straight line at the KEKB in­jec­tor linac. The high-pre­ci­sion align­ment sys­tem is strongly re­quired for the Super B-fac­tory at KEK. The laser-based align­ment sys­tem com­prises a He-Ne laser source and op­ti­cal com­po­nents for de­liv­er­ing the laser beam, and sil­i­con pho­tode­tec­tors. The laser-based align­ment sys­tem aligns a mis­align­ment of a girder unit for ac­cel­er­at­ing struc­tures while ac­cel­er­a­tor com­po­nents on the girder unit are aligned with an­other laser tracker sys­tem with a sim­i­lar pre­ci­sion level. A new PC-based feed­back sys­tem for the laser point­ing sta­bil­ity has been in­tro­duced in order to sta­bi­lize the trans­verse laser po­si­tions at the pho­tode­tec­tor. The ex­per­i­men­tal re­sults show that al­though the laser point­ing sta­bil­ity is eas­ily dis­turbed by en­vi­ron­men­tal fac­tors with­out the feed­back sys­tem, it has been suc­cess­fully ap­plied to con­trol the laser point­ing sta­bil­ity within a few ten-mi­cron-me­ter. In this re­port, the ex­per­i­men­tal in­ves­ti­ga­tions in the new feed­back sys­tem are re­ported.