Title :
Virtual Accelerator for Accelerator Optics Improvement
Author :
Yan, Y.T. ; Cai, Y. ; Decker, F-J. ; Ecklund, S. ; Irwin, J. ; Seeman, J. ; Sullivan, M. ; Turner, J. ; Wienands, U.
Author_Institution :
SLAC, Stanford, CA 94309 USA, yan@slac.stanford.edu
Abstract :
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.
Keywords :
Accelerator magnets; Data acquisition; Data mining; Extraterrestrial measurements; Lattices; Linear accelerators; Magnetic analysis; Optical buffering; Optical coupling; Orbital calculations;
Conference_Titel :
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the
Print_ISBN :
0-7803-8859-3
DOI :
10.1109/PAC.2005.1591493