Author: Hara, T.
Paper Title Page
MOP022 Pulse by Pulse Electron Beam Distribution for Multi-beamline Operation at SACLA 71
 
  • T. Hara, T. Inagaki, C. Kondo, Y. Otake, H. Takebe, H. Tanaka
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  • K. Fukami
    JASRI/SPring-8, Hyogo-ken, Japan
  
  In order to meet the in­creas­ing de­mand for XFEL user op­er­a­tion, the sec­ond un­du­la­tor beam­line (BL2) will be in­stalled dur­ing the 2014 sum­mer shut­down at SACLA. Fol­low­ing the in­stal­la­tion of BL2, a pulse by pulse elec­tron beam dis­tri­b­u­tion sys­tem com­posed of a kicker and a DC twin-sep­tum mag­net, which are cur­rently under de­vel­op­ment, is planned be in­stalled in Jan­u­ary 2015. To dis­trib­ute the elec­tron beam on a bunch-to-bunch basis, the elec­tron beam is de­flected into 0 and ±10 mrad di­rec­tions at 60 Hz by the kicker, and then the DC twin-sep­tum mag­net aug­ments the sep­a­ra­tion angle to ±50 mrad. The kicker mag­net is dri­ven by a 60 Hz trape­zoidal wave­form and sta­bil­ity less than 30 ppm (peak-peak) has been achieved. This pulse by pulse dis­tri­b­u­tion sys­tem will be also used for the beam in­jec­tion to the up­graded low emit­tance ring of SPring-8 (SPring-8-II) in fu­ture. Since the SPring-8-II stor­age ring has a small dy­namic aper­ture, low emit­tance is re­quired for the in­jec­tion beam. Also the beam in­jec­tion in par­al­lel with the XFEL op­er­a­tion en­ables to save the run­ning cost of the in­jec­tor dur­ing top-up op­er­a­tion.  
 
TUC01 Hard X-ray Self-Seeding Setup and Results at SACLA 603
 
  • T. Inagaki, N. Adumi, T. Hara, T. Ishikawa, R. Kinjo, H. Maesaka, Y. Otake, H. Tanaka, T. Tanaka, K. Togawa, M. Yabashi
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  • S. Goto, Y. Inubushi, T.K. Kameshima, T. Ohata, K. Tono
    JASRI/SPring-8, Hyogo, Japan
  • T. Hasegawa, S. Tanaka
    SES, Hyogo-pref., Japan
  • H. Kimura, A. Miura, H. Ohashi, H. Yamazaki
    Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), Hyogo, Japan
  
  In order to im­prove the spec­tral and tem­po­ral prop­er­ties of XFEL, the self-seed­ing op­tion based on the trans­mis­sion crys­tal op­tics has been im­ple­mented in SACLA since 2012. The self-seed­ing setup com­posed of four di­pole mag­nets that can gen­er­ate up to 50 fs tem­po­ral delay and a di­a­mond sin­gle crys­tal with the thick­ness of 180 mi­cro-m has been in­stalled at the po­si­tion of the 9th un­du­la­tor seg­ment, which has been moved down­stream. In 2013, the in­stal­la­tion of all the com­po­nents has been com­pleted in Au­gust and the com­mis­sion­ing has been started in Oc­to­ber. After a num­ber of tun­ing processes such as the beam col­li­ma­tion and un­du­la­tor K-value op­ti­miza­tion, sig­nif­i­cant spec­tral nar­row­ing has been con­firmed at 10 keV with the C(400) Bragg re­flec­tion. The spec­tral band­width of seeded FEL is about 3 eV, which is nearly one order nar­rower than that of SASE mea­sured with­out the di­a­mond crys­tal. The peak spec­tral in­ten­sity of seeded FEL is about 5 times higher than that of SASE. Sys­tem­atic op­ti­miza­tion on beam prop­er­ties is now in progress to­wards ex­per­i­men­tal use of seeded XFELs. This talk gives the overview of the plan, achieved re­sults and on­go­ing R&D.  
slides icon Slides TUC01 [20.337 MB]