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Naruse, N.

Paper Title Page
THPEC029 Photocathode Femtosecond Electron Beam Applications: Femtosecond Pulse Radiolysis and Femtosecond Electron Diffraction 4113
 
  • J. Yang, K. Kan, T. Kondoh, Y. Murooka, N. Naruse, K. Tanimura, Y. Yoshida
    ISIR, Osaka
  • J. Urakawa
    KEK, Ibaraki
  
 

Both ul­tra­fast time-re­solved ra­di­ol­y­sis and elec­tron diffrac­tion based on pho­to­cath­ode rf elec­tron guns have been de­vel­oped in Osaka Uni­ver­si­ty to re­veal the hid­den dy­nam­ics of in­tri­cate molec­u­lar and atom­ic pro­cess­es in ma­te­ri­als. One of the pho­to­cath­ode rf guns has been used suc­cess­ful­ly to pro­duce a 100-fs high-bright­ness elec­tron sin­gle bunch with a boost­er lin­ear ac­cel­er­a­tor and a mag­net­ic bunch com­pres­sor. The time res­o­lu­tion of 240 fs was achieved at the first time in the pulse ra­di­ol­y­sis. An­oth­er pho­to­cath­ode rf gun, which pro­duces di­rect­ly a near-rel­a­tivis­tic 100-fs elec­tron beam, has been de­vel­oped to con­struct fem­tosec­ond elec­tron diffrac­tion. The mega­volt elec­tron diffrac­tion pat­terns have been ob­served. The de­pen­dences of the emit­tance, bunch length and en­er­gy spread on the ra­dio-fre­quen­cy (rf) and space charge ef­fects in the rf gun were in­ves­ti­gat­ed.