Dispersion and betatron function correction in the Advanced Photon Source storage ring using singular value decomposition.

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Magnet errors and off-center orbits through sextuples 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 sextuples 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 ... continued below

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5 p.

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Emery, L. April 13, 1999.

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Magnet errors and off-center orbits through sextuples 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 sextuples 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 will be presented.

Physical Description

5 p.

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INIS; OSTI as DE00011119

Medium: P; Size: 5 pages

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  • 1999 Particle Accelerator Conference (PAC '99), New York, NY (US), 03/29/1999--04/02/1999

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  • Report No.: ANL/ASD/CP-97709
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11119
  • Archival Resource Key: ark:/67531/metadc625246

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  • April 13, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 11, 2017, 12:17 p.m.

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Emery, L. Dispersion and betatron function correction in the Advanced Photon Source storage ring using singular value decomposition., article, April 13, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc625246/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.