LER Injection Line B2/B4 Study

During the PEP-II LER commissioning run in July 1998 the beam pro le in the tune up dump pro le monitor just before LER injection showed an anomalous parbolic shape. The sextupole component of the eld of bend magnets B2 and B4 in the beginning of the south injection tunnel (SIT) was thought to be the cause of this. An o -line model of the B2/B4 bend magnet eld was created using DIMAD. Results of particle tracking simulated in DIMAD were compared with on-line lattice diagnostic data and observations of the beam pro le on the tune up dump screen. Presented at the IEEE Particle Accelerator Conference, PAC99 New York, NY, USA March 29{April 2, 1999 Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309 Work supported by Department of Energy contract DE{AC03{76SF00515. LER Injection Line B2/B4 Study R.H. Iverson, F.-J. Decker, D. Schultz, C. Spencer, J. Turner, U. Wienands, SLAC*