Polarization correlations in the SLC final focus

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At the SLC, the electron beam polarization (P) is measured by a Compton polarimeter downstream of the Interaction Point. This measurement averages over the entire beam distribution and must be corrected for various correlations to calculate the luminosity (L) weighted polarization. Because the spin rotation in the ARC is energy dependent, off energy particles have lower polarization. These particles may also be poorly focused and contribute less luminosity due to the higher order chromatic optics of the final focus. The small vertical {beta} function at the interaction point also causes an hour-glass effect, where particles at the head and tail ... continued below

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3 p.

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Decker, F.J. May 1, 1995.

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Description

At the SLC, the electron beam polarization (P) is measured by a Compton polarimeter downstream of the Interaction Point. This measurement averages over the entire beam distribution and must be corrected for various correlations to calculate the luminosity (L) weighted polarization. Because the spin rotation in the ARC is energy dependent, off energy particles have lower polarization. These particles may also be poorly focused and contribute less luminosity due to the higher order chromatic optics of the final focus. The small vertical {beta} function at the interaction point also causes an hour-glass effect, where particles at the head and tail of the bunch have less luminosity. Since there is an energy-z correlation due to the compensation of longitudinal wakefields in the linac, these particles may also have lower polarization. The correlations are: z <--> E (linac), E <--> P (ARC), z <--> L (hour-glass) and E <--> L (chromaticity). The contributions from the z <--> E and z <--> L correlations are discussed.

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3 p.

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INIS; OSTI as DE95010742

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  • 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995

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  • Other: DE95010742
  • Report No.: SLAC-PUB--95-6881
  • Report No.: CONF-950512--99
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 71353
  • Archival Resource Key: ark:/67531/metadc705894

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 1995

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 2, 2016, 5:44 p.m.

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Decker, F.J. Polarization correlations in the SLC final focus, article, May 1, 1995; Menlo Park, California. (digital.library.unt.edu/ark:/67531/metadc705894/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.