Fringe Pattern of the PEP-II Synchrotron-Light Interferometers

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Description

Synchrotron-light interferometry is used to measure the vertical beam sizes in the high-energy and low-energy rings (HER and LER) of the PEP-II B Factory at SLAC. Light from a point in a dipole magnet is diffracted by two slits and then imaged onto a CCD camera. A curve fitting algorithm matches the measured interference fringes to a calculated pattern that includes the effect on the modulation depth of the fringes due to both the small but nonzero source size and the narrow bandpass of the optical filter. These formulas are derived here. Next, an additional focusing term from the primary ... continued below

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12 pages

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Fisher, Alan & /SLAC September 19, 2005.

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Description

Synchrotron-light interferometry is used to measure the vertical beam sizes in the high-energy and low-energy rings (HER and LER) of the PEP-II B Factory at SLAC. Light from a point in a dipole magnet is diffracted by two slits and then imaged onto a CCD camera. A curve fitting algorithm matches the measured interference fringes to a calculated pattern that includes the effect on the modulation depth of the fringes due to both the small but nonzero source size and the narrow bandpass of the optical filter. These formulas are derived here. Next, an additional focusing term from the primary mirror in the vacuum chamber is considered. The mirror needs extensive cooling due to the intense fan of synchrotron x-rays and is likely to have a slight stress-induced curvature, which must be considered to determine the true source size.

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12 pages

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  • Report No.: SLAC-TN-05-048
  • Grant Number: AC02-76SF00515
  • DOI: 10.2172/878407 | External Link
  • Office of Scientific & Technical Information Report Number: 878407
  • Archival Resource Key: ark:/67531/metadc876267

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  • September 19, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 28, 2016, 6:06 p.m.

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Fisher, Alan & /SLAC. Fringe Pattern of the PEP-II Synchrotron-Light Interferometers, report, September 19, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc876267/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.