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Krejcik, P.

Paper Title Page
WEPD057 Linac Energy Management for LCLS 3224
 
  • P. Chu, R.H. Iverson, P. Krejcik, D. Rogind, G.R. White, M. Woodley
    SLAC, Menlo Park, California
 
 

Linac Energy Management (LEM) is a control system program which calculates, and optionally implements, magnet setpoint settings (BDESs) following a change in Energy (such as a change in the number, phase, and amplitude of active klystrons). The change is made relative to those magnets' existing BDES setpoints by a factor encoding the change in energy. LEM is necessary because changes in the number, phase, and amplitude of the active klystrons (the so-called "Klystron complement") change the beam's rigidity, and therefore, to maintain constant optics, one has to change focusing gradients and bend fields. This paper describes the basic process and some of the implementation lessons learned for LEM at the LCLS.

 
THPEC015 Breaking the Attosecond, Angstrom and TV/m Field Barriers with Ultra-fast Electron Beams 4080
 
  • J.B. Rosenzweig, G. Andonian, A. Fukasawa, E. Hemsing, G. Marcus, A. Marinelli, P. Musumeci, B.D. O'Shea, F.H. O'Shea, C. Pellegrini, D. Schiller, G. Travish
    UCLA, Los Angeles, California
  • P.H. Bucksbaum, M.J. Hogan, P. Krejcik
    SLAC, Menlo Park, California
  • M. Ferrario
    INFN/LNF, Frascati (Roma)
  • S.J. Full
    Penn State University, University Park, Pennsylvania
  • P. Muggli
    USC, Los Angeles, California
 
 

Recent initiatives at UCLA concerning ultra-short, GeV electron beam generation have been aimed at achieving sub-fs pulses capable of driving X-ray free-electron lasers (FELs) in single-spike mode. This uses of very low charge beams, which may allow existing FEL injectors to produce few-100 attosecond pulses, with very high brightness. Towards this end, recent experiments at the Stanford X-ray FEL (LCLS, first of its kind, built with essential UCLA leadership) have produced ~2 fs, 20 pC electron pulses. We discuss here extensions of this work, in which we seek to exploit the beam brightness in FELs, in tandem with new developments at UCLA in cryogenic undulator technology, to create compact accelerator/undulator systems that can lase below 0.15 Angstroms, or be used to permit 1.5 Angstrom operation at 4.5 GeV. In addition, we are now developing experiments which use the present LCLS fs pulses to excite plasma wakefields exceeding 1 TV/m, permitting a table-top TeV accelerator for frontier high energy physics applications.