Author: Gierman, S.M.
Paper Title Page
THP191 Recent Progress in Injector Improvement of SPEAR 3 2477
 
  • K. Tian, W.J. Corbett, D. Dell'Orco, D. Ernst, S.M. Gierman, J.A. Safranek, J.F. Schmerge, B. Scott
    SLAC, Menlo Park, California, USA
 
  The frequent injection and high current operation of SPEAR 3 storage ring requires high stability of the injector system at the Stanford Synchrotron Radiation Laboratory (SSRL). The lattice of linac-to-booster (LTB) transport line was not well understood and controlled prior to this work. In this paper, we discuss the significant efforts that have been made to improve the performance of the LTB. A method to correct the distortion of the closed orbit in the booster by moving 2 quadrupoles is also presented.  
 
THP217 Frequent Fill Top-Off Injection at SPEAR3 2531
 
  • J.J. Sebek, S. Allison, S.M. Gierman, X. Huang, J.A. Safranek, J.F. Schmerge, K. Tian, C. Wermelskirchen
    SLAC, Menlo Park, California, USA
 
  Funding: Work supported by the U.S. Department of Energy under contract number DE-AC02-76-SF00515
SPEAR3 beam is now delivered to users in a "frequent fill" mode in which beam is injected into the storage ring, with beam-line shutters open, on a periodic schedule so that the beam current is kept constant to within 1% of its average value. This goal was achieved with the constraints of having the SPEAR3 injector run at very high reliability and ensuring that there would be no challenges to the beam containment system in this operational mode. This paper presents the accelerator development, the hardware changes, and the software developed to implement this operational mode.