Virtual Accelerator for Accelerator Optics Improvement

Conference · Fri Sep 30 04:00:00 EDT 2005

OSTI ID:878378

Yan, Y T; Cai, Y; Decker, F-J; Ecklund, S; Irwin, J; Seeman, J; Sillivan, M; Turner, J; Wienands, U

Through determination of all quadrupole strengths and sextupole feed-downs by fitting quantities derivable from precision orbit measurement, one can establish a virtual accelerator that matches the real accelerator optics. These quantities (the phase advances, the Green's functions, and the coupling ellipses tilt angles and axis ratios) are obtained by analyzing turn-by-turn Beam Position Monitor (BPM) data with a model-independent analysis (MIA). Instead of trying to identify magnet errors, a limited number of quadrupoles are chosen for optimized strength adjustment to improve the virtual accelerator optics and then applied to the real accelerator accordingly. These processes have been successfully applied to PEP-II rings for beta beating fixes, phase and working tune adjustments, and coupling reduction to improve PEP-II luminosity.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 878378
• Report Number(s): SLAC-PUB-11209
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ACCURACY
Accelerators
ACCPHY
ACCSYS
BEAM POSITION
LUMINOSITY
MAGNETS
MONITORS
OPTICS
QUADRUPOLES