Author: Takai, R.
Paper Title Page
WEIALH2045
 Non-destructive Beam Position Monitoring in Two-Beam Section of ERL  
 
  • T. Obina, R. Takai
    KEK, Ibaraki, Japan
  
  At the straight sec­tion with su­per­con­duct­ing cav­i­ties, two beams with dif­fer­ent en­er­gies are pass­ing through same vac­uum ves­sels, and sep­a­rate mea­sure­ments of such beams are es­sen­tial for beam com­mis­sion­ing and tun­ing in en­ergy re­cov­ery linacs. De­struc­tive meth­ods such as “screen mon­i­tor with a hole” are uti­lized in many ERLs in order to mea­sure the re­cir­cu­lated beam; how­ever, the method is not suit­able for CW op­er­a­tion with high charge. In the com­pact ERL at KEK, typ­i­cal macro-pulse length for beam tun­ing is 1000 ns. In the two-beam sec­tion, dif­fer­ence of ar­rival time of pre- and post-ac­cel­er­ated beam of 300 ns is long enough to sep­a­rate two beams. We can mea­sure the beam po­si­tion by gat­ing the sig­nal from stripline elec­trode. The over­lapped part of the two-beam sig­nals is sen­si­tive to the phase of two beams, and they can be uti­lized for path-length ad­just­ment of the beam. The ex­per­i­men­tal re­sults dur­ing the macro-pulse and CW op­er­a­tion will be pre­sented in this paper.  
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