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Accession Number DE2012-1045813
Title Characterization of Slow Orbit Motion in SPEAR3.
Publication Date 2012
Media Count 3p
Personal Author G. Gassner J. Safranek N. Sunilkumar Y. Yan
Abstract 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.
Keywords Accelerators
Ambient temperature
Concrete blocks
Electron beams
Ground motion
Light sources
Photon beams
Storage rings
Synchrotron radiation

Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 46 - Physics
Corporate Author Stanford Linear Accelerator Center, CA.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1226
Contract Number DE-AC02-76SF00515

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