Ground motion improvements in SPEAR3

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James A. Safranek, Yiton T. Yan, Domenico Dell'Orco, Georg Gassner and Nikita Sunilkumar. Ground motion improvements in SPEAR3[J]. Chinese Physics C, 2016, 40(9): 097005. doi: 10.1088/1674-1137/40/9/097005
James A. Safranek, Yiton T. Yan, Domenico Dell'Orco, Georg Gassner and Nikita Sunilkumar. Ground motion improvements in SPEAR3[J]. Chinese Physics C, 2016, 40(9): 097005.  doi: 10.1088/1674-1137/40/9/097005 shu
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Received: 2016-02-18
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    Supported by US Department of Energy (DE-AC02-76SF00515) and the SULI program at SLAC National Laboratory

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Ground motion improvements in SPEAR3

    Corresponding author: James A. Safranek,
    Corresponding author: Yiton T. Yan,
Fund Project:  Supported by US Department of Energy (DE-AC02-76SF00515) and the SULI program at SLAC National Laboratory

Abstract: SPEAR3 is a third-generation synchrotron light source storage ring, about 234 meters in circumference. To meet the beam stability requirement, our goal is to ultimately achieve an orbit variation (relative to the photon beam lines) of less than 10% of the beam size, which is about 1 micron in the vertical plane. Hydrostatic leveling system (HLS) measurements show that the height of the SPEAR3 tunnel floor can vary by tens of microns daily without thermal insulation improvements. We present an analysis of the HLS data that shows that adding thermal insulation to the concrete walls of the storage ring tunnel dramatically decreased diurnal tunnel floor motion.

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