Author: Dirsat, M.
Paper Title Page
THPO024 Development of a Non-Linear Kicker System to Facilitate a New Injection Scheme for the BESSY II Storage Ring 3394
 
  • O. Dressler, T. Atkinson, M. Dirsat, P. Kuske
    HZB, Berlin, Germany
  • H. Rast
    DELTA, Dortmund, Germany
  
  Top-Up in­jec­tions with­out no­tice­able mo­tion of the stored beam is a chal­lenge. The com­mon method of beam ac­cu­mu­la­tion with a local bump formed by four in­de­pen­dent pulsed dipole kick­er mag­nets usu­al­ly caus­es beam os­cil­la­tions. The match­ing of the four in­de­pen­dent kick­er sys­tems re­gard­ing pulse jit­ters and shapes is tech­no­log­i­cal­ly lim­it­ed. Af­ter­ward the beam ex­ci­ta­tion was re­duced more when two kick­er mag­nets on each side of the sep­tum were pow­ered in se­ries by one pulser unit. An even more promis­ing ap­proach is to adopt an al­ter­na­tive in­jec­tion method de­ploy­ing a sin­gle non-lin­ear kick­er mag­net with zero Bx,y-field in the cen­ter and an off-ax­is max­i­mum, By, which is hor­i­zon­tal­ly dis­placed by 10-12 mm. There the in­ject­ed beam gets kicked and loos­es half of its trans­verse mo­men­tum. Such a mag­net was de­signed and built as a short in-vac­u­um mag­net with a small ver­ti­cal gap height. For first beam tests the kick­er was placed in the sec­ond straight sec­tion after the in­jec­tion point, and the 1.5 μs pulse was de­signed to de­flect the 1.72 GeV beam by 1 mrad. In this paper, the cal­cu­la­tions of the mag­net­ic fields, the me­chan­i­cal de­sign as well as the elec­tri­cal pulser cir­cuit are de­scribed.
*New injection scheme using a pulsed quadrupole magnet in electron storage rings, Kentaro Harada, PHYSICAL REVIEW SPECIAL TOPICS - AB 10, 123501 (2007)