Characterization of Slow Orbit Motion in the SPEAR3

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SPEAR3 is a third-generation synchrotron light source storage ring. The beam stability requirements are {approx}10% of the beam size, which is about 1 micron in the vertical plane. Hydrostatic level system (HLS) measurements show that the height of the SPEAR3 tunnel floor varies by tens of microns daily. We present analysis of the HLS data, including accounting for common-mode tidal motion. We discuss the results of experiments done to determine the primary driving source of ground motion. We painted the accelerator tunnel walls white; we temporarily installed Mylar over the asphalt in the center of the accelerator; and we put ... continued below

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3 pages

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Sunilkumar, Nikita; U., /Southern California; Gassner, Georg; /SLAC; Safranek, James; /SLAC et al. July 9, 2012.

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SPEAR3 is a third-generation synchrotron light source storage ring. The beam stability requirements are {approx}10% of the beam size, which is about 1 micron in the vertical plane. Hydrostatic level system (HLS) measurements show that the height of the SPEAR3 tunnel floor varies by tens of microns daily. We present analysis of the HLS data, including accounting for common-mode tidal motion. We discuss the results of experiments done to determine the primary driving source of ground motion. We painted the accelerator tunnel walls white; we temporarily installed Mylar over the asphalt in the center of the accelerator; and we put Mylar over a section of the tunnel walls.

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3 pages

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  • Journal Name: Conf.Proc.C100523:MOPE097,2010; Conference: 1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010, Kyoto, Japan

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  • Report No.: SLAC-PUB-15176
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1045813
  • Archival Resource Key: ark:/67531/metadc840526

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Office of Scientific & Technical Information Technical Reports

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  • July 9, 2012

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  • May 19, 2016, 9:45 a.m.

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  • June 21, 2016, 12:24 p.m.

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Sunilkumar, Nikita; U., /Southern California; Gassner, Georg; /SLAC; Safranek, James; /SLAC et al. Characterization of Slow Orbit Motion in the SPEAR3, article, July 9, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc840526/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.