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Storage ring lattice calibration using resonant spin depolarization

Wootton, K. P.; Boland, M. J.; Corbett, W. J.; Huang, X.; LeBlanc, G. S.; Lundin, Magnus LU ; Panopoulos, H. P.; Safranek, J. A.; Tan, Y. -R. E. and Taylor, G. N., et al. (2013) In Physical Review Special Topics. Accelerators and Beams 16(7).
Abstract
This paper presents measurements of the GeV-scale electron beam energy for the storage rings at the synchrotron light source facilities Australian Synchrotron (AS) and SPEAR3 at SLAC. Resonant spin depolarization was employed in the beam energy measurement, since it is presently the highest precision technique and an uncertainty of order 10(-6) was achieved at SPEAR3 and AS. Using the resonant depolarization technique, the beam energy was measured at various rf frequencies to measure the linear momentum compaction factor. This measured linear momentum compaction factor was used to evaluate models of the beam trajectory through combined-function bending magnets. The main bending magnets of both lattices are rectangular, horizontally... (More)
This paper presents measurements of the GeV-scale electron beam energy for the storage rings at the synchrotron light source facilities Australian Synchrotron (AS) and SPEAR3 at SLAC. Resonant spin depolarization was employed in the beam energy measurement, since it is presently the highest precision technique and an uncertainty of order 10(-6) was achieved at SPEAR3 and AS. Using the resonant depolarization technique, the beam energy was measured at various rf frequencies to measure the linear momentum compaction factor. This measured linear momentum compaction factor was used to evaluate models of the beam trajectory through combined-function bending magnets. The main bending magnets of both lattices are rectangular, horizontally defocusing gradient bending magnets. Four modeling approaches are compared for the beam trajectory through the bending magnet: a circular trajectory, linear and nonlinear hyperbolic cosine trajectories, and numerical evaluation of the trajectory through the measured magnetic field map. Within the uncertainty of the measurement the momentum compaction factor is shown to agree with the numerical model of the trajectory within the bending magnet, and disagree with the hyperbolic cosine approximation. (Less)
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published
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Physical Review Special Topics. Accelerators and Beams
volume
16
issue
7
publisher
American Physical Society
external identifiers
  • wos:000321127500002
  • scopus:84883549451
ISSN
1098-4402
DOI
10.1103/PhysRevSTAB.16.074001
language
English
LU publication?
yes
id
1c8bbd45-171f-4e18-8461-8922316ea5bb (old id 3979736)
date added to LUP
2013-09-11 15:37:08
date last changed
2019-10-15 04:31:06
@article{1c8bbd45-171f-4e18-8461-8922316ea5bb,
  abstract     = {This paper presents measurements of the GeV-scale electron beam energy for the storage rings at the synchrotron light source facilities Australian Synchrotron (AS) and SPEAR3 at SLAC. Resonant spin depolarization was employed in the beam energy measurement, since it is presently the highest precision technique and an uncertainty of order 10(-6) was achieved at SPEAR3 and AS. Using the resonant depolarization technique, the beam energy was measured at various rf frequencies to measure the linear momentum compaction factor. This measured linear momentum compaction factor was used to evaluate models of the beam trajectory through combined-function bending magnets. The main bending magnets of both lattices are rectangular, horizontally defocusing gradient bending magnets. Four modeling approaches are compared for the beam trajectory through the bending magnet: a circular trajectory, linear and nonlinear hyperbolic cosine trajectories, and numerical evaluation of the trajectory through the measured magnetic field map. Within the uncertainty of the measurement the momentum compaction factor is shown to agree with the numerical model of the trajectory within the bending magnet, and disagree with the hyperbolic cosine approximation.},
  articleno    = {074001},
  author       = {Wootton, K. P. and Boland, M. J. and Corbett, W. J. and Huang, X. and LeBlanc, G. S. and Lundin, Magnus and Panopoulos, H. P. and Safranek, J. A. and Tan, Y. -R. E. and Taylor, G. N. and Tian, K. and Rassool, R. P.},
  issn         = {1098-4402},
  language     = {eng},
  number       = {7},
  publisher    = {American Physical Society},
  series       = {Physical Review Special Topics. Accelerators and Beams},
  title        = {Storage ring lattice calibration using resonant spin depolarization},
  url          = {http://dx.doi.org/10.1103/PhysRevSTAB.16.074001},
  volume       = {16},
  year         = {2013},
}