Author: Lindenberg, A.
Paper Title Page
MOPO044 Bunch Length Measurements in Low-Alpha Mode at SPEAR3 with First Time-Resolved Pump/Probe Experiments* 583
 
  • J.S. Wittenberg, A. Lindenberg, A. Miller
    Stanford University, Stanford, California, USA
  • W.J. Corbett, L. Wang
    SLAC, Menlo Park, California, USA
  
  Funding: Work sponsored by U.S. Department of Energy Contract DE-AC03-76SF00515, Office of Basic Energy Sciences and SLAC Laboratory Directed Research Development funds (LDRD)
The SPEAR3 syn­chrotron light source can be op­er­at­ed in low-al­pha mode to gen­er­ate x-ray pulse du­ra­tions of order 1ps, well below streak cam­era res­o­lu­tion lim­its yet ac­ces­si­ble by laser/sr cross-cor­re­la­tion mea­sure­ments. Ini­tial CC tests per­formed with a 50fs TiSa laser, fre­quen­cy dou­bling BBO, pho­to­di­ode and lock-in am­pli­fi­er re­solved bunch lengths down to about 6ps rms with 85uA sin­gle-bunch cur­rent. By re­con­fig­ur­ing the ex­per­i­men­tal setup to uti­lize a fiber laser, sum fre­quen­cy gen­er­a­tion and sin­gle pho­ton counter it is now pos­si­ble to mea­sure pro­files in the 1ps rms range with only 5uA sin­gle-bunch cur­rent. In this paper we re­port on the most re­cent mea­sure­ments, sim­u­la­tions, mod­el­ing ef­forts and prospects for fur­ther im­prove­ment.