Author: Mitsuda, C.
Paper Title Page
MOPEA027 New Optics with Emittance Reduction at the SPring-8 Storage Ring 133
 
  • Y. Shimosaki, K. Fukami, K.K. Kaneki, K. Kobayashi, M. Masaki, C. Mitsuda, T. Nakamura, T. Nakanishi, H. Ohkuma, M. Oishi, M. Shoji, K. Soutome, S. Takano, M. Takao
    JASRI/SPring-8, Hyogo-ken, Japan
  
  The ma­chine tun­ing of a new op­tics is in progress at the SPring-8 stor­age ring, in order not only to pro­vide bril­liant pho­tons for cur­rent users but also to study a strat­egy of a lat­tice de­sign and a tun­ing sce­nario for the up­grade pro­ject SPring-8 II. The nat­ural emit­tance is re­duced to 2.4 nmrad from the pre­sent value of 3.4 nmrad with­out any change of mag­net po­si­tions. The flux den­sity 1.3 times higher than the pre­sent was ob­served at the di­ag­nos­tics beam­line. The nom­i­nal in­jec­tion ef­fi­ciency of the order of 80 % has been achieved (the pre­sent: 92 %) by cor­rect­ing the error of the op­tics func­tion, by ad­just­ing the strength of the in­jec­tion mag­nets and by op­ti­miz­ing the sex­tu­pole mag­netic fields. The beam life­time was 13 h at 1 mA / bunch (the pre­sent: 22 h), and the mo­men­tum aper­ture es­ti­mated from the mea­sure­ment of the Tou­schek life­time was 2.3 % (the pre­sent: 2.8 %). Though these are tol­er­a­ble to the user op­er­a­tion, fur­ther op­ti­miza­tion of the sex­tupoles is on­go­ing. After ver­i­fy­ing the pho­ton beam per­for­mance at beam­lines, this new op­tics will be ap­plied to the user op­er­a­tion. The op­tics de­sign and its beam per­for­mance will be pre­sented in de­tail.  
 
MOPWA003 New Development of Compact Fast Pulsed Power Supply System in the SPring-8 666
 
  • C. Mitsuda, K. Fukami, K. Kobayashi, T. Nakanishi, H. Ohkuma, S. Sasaki
    JASRI/SPring-8, Hyogo-ken, Japan
  • T. Ohshima
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  
  We have de­vel­oped a com­pact fast pulsed power sup­ply sys­tem as a part of the de­vel­op­ment of the fast kicker mag­net sys­tem in the SPring-8 stor­age ring. The kicker mag­net is needed for the 1 ps short pulsed X-ray gen­er­a­tion by a ver­ti­cal kick and the sup­pres­sion of the fast beam os­cil­la­tion by counter kick. The re­quired pulse width and cur­rent for above ap­pli­ca­tions have to be a enough short time less than 4.8 us of the rev­o­lu­tion time and more than 200 A re­spec­tively. We se­lected a Si-MOS­FET as a switch­ing de­vice be­cause a MOS­FET has two ca­pa­bil­i­ties of the fast switch­ing and high-volt­age re­sis­tance, and has a smaller size than an IGBT. The cur­rent are in­creased by par­al­lel or par­al­lel-se­ries con­nect­ing of MOS­FETs. We started the de­vel­op­ment of a test sys­tem whose out­put cur­rent was a 67 A with a pulse width of 1.0 us in 2008. From 2009 to 2011, we suc­ceeded in achiev­ing the out­put cur­rent of a 270 A with a pulse width of 0.8 us by using pro­to­type sys­tem. In 2012, by in­creas­ing the num­ber of MOS­FET, we con­firmed the out­put cur­rent of 250 A with a pulse width of 0.5 us, whose case size is a just 210(W) x 160(H) x 300(D) mm. We will re­port the de­vel­op­ment sta­tus in de­tail.