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Yan, Y.T.

Paper Title Page
MOPE097 Characterization of Slow Orbit Motion in the SPEAR3 1215
 
  • N. Sunilkumar
    USC, Los Angeles, California
  • G.L. Gassner, J.A. Safranek, Y.T. Yan
    SLAC, Menlo Park, California
 
 

SPEAR3 is a third-generation synchrotron light source storage ring. The beam stability requirements are ~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.