DocumentCode :
345557
Title :
Dispersion and betatron function correction in the Advanced Photon Source storage ring using singular value decomposition
Author :
Emery, L.
Author_Institution :
Argonne Nat. Lab., IL, USA
Volume :
1
fYear :
1999
fDate :
1999
Firstpage :
401
Abstract :
Magnet errors and off-center orbits through sextupoles perturb the dispersion and beta functions in a storage ring (SR), which affects machine performance. In a large ring such as the Advanced Photon Source (APS), the magnet errors are difficult to determine with beam-based methods. Also the non-zero orbit through sextupoles result from user requests for steering at light source points. For expediency, a singular value decomposition (SVD) matrix method analogous to orbit correction was adopted to make global corrections to these functions using strengths of several quadrupoles as correcting elements. The direct response matrix is calculated from the model of the perfect lattice. The inverse is calculated by SVD with a selected number of singular vectors. Resulting improvement in the lattice functions and machine performance are presented
Keywords :
accelerator control systems; electron accelerators; particle beam stability; singular value decomposition; storage rings; Advanced Photon Source storage ring; betatron function correction; direct response matrix; dispersion; global corrections; magnet errors; off-center orbits; orbit correction; singular value decomposition; singular vectors; Apertures; Calibration; Error correction; Extraterrestrial measurements; Lattices; Matrix decomposition; Orbital calculations; Orbits; Singular value decomposition; Storage rings;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
Type :
conf
DOI :
10.1109/PAC.1999.795716
Filename :
795716
Link To Document :
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