Virtual Accelerator for Accelerator Optics Improvement

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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 ... continued below

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3 pages

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Yan, Y.T.; Cai, Y.; Decker, F-J.; Ecklund, S.; Irwin, J.; Seeman, J. et al. September 30, 2005.

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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.

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3 pages

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  • Contributed to Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 16-20 May 2005

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  • Report No.: SLAC-PUB-11209
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 878378
  • Archival Resource Key: ark:/67531/metadc879971

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  • September 30, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 6:10 p.m.

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Yan, Y.T.; Cai, Y.; Decker, F-J.; Ecklund, S.; Irwin, J.; Seeman, J. et al. Virtual Accelerator for Accelerator Optics Improvement, article, September 30, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc879971/: accessed November 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.