Title :
Application of model-independent analysis to PEP-II rings
Author :
Cai, Y. ; Irwin, J. ; Sullivan, M. ; Yan, Y.T.
Author_Institution :
Linear Accel. Center, Stanford Univ., CA, USA
Abstract :
Model independent analysis (MIA), which employs statistical methods to reveal one-micron charge-induced centroid changes in pulse-by-pulse beam-position-monitor (BPM) measurements at the SLAC linac has been extended to storage rings, and is here applied at PEP-II to analyze transverse motion. The beam is resonantly excited by a shaker in the horizontal and vertical directions and 2050 consecutive-turn measurements of all BPMs are buffered. Four high-precision linearly-independent orbits are determined. Local Green´s functions specified by the local transfer matrix components R12, R34, R32, and R14 are extracted from these orbits and fitted with the model lattice using an SVD-enhanced method. The BPM gain and cross-plane coupling along with 1 normal- and 1 skew-quadrupole strength are determined per single-view BPM
Keywords :
Green´s function methods; colliding beam accelerators; electron accelerators; particle beam diagnostics; statistical analysis; storage rings; transfer function matrices; PEP-II rings; charge-induced centroid changes; consecutive-turn measurements; cross-plane coupling; high-precision linearly-independent orbits; local Green functions; local transfer matrix components; model-independent analysis; puise-by-pulse beam-position-monitor measurements; quadrupole strength; statistical methods; storage rings; transverse motion; Current measurement; Extraterrestrial measurements; Independent component analysis; Linear particle accelerator; Motion analysis; Motion measurement; Orbits; Pulse measurements; Statistical analysis; Storage rings;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.988176
