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

Volume

5

fYear

2001

fDate

2001

Firstpage

3555

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001

Conference_Location

Chicago, IL

Print_ISBN

0-7803-7191-7

Type

conf

DOI

10.1109/PAC.2001.988176

Filename

988176