Ground motion improvements in SPEAR3

James A. Safranek; Yiton T. Yan; Domenico Dell'Orco; Georg Gassner; Nikita Sunilkumar

doi:10.1088/1674-1137/40/9/097005

Chinese Physics C> 2016, Vol. 40> Issue(9) : 097005 DOI: 10.1088/1674-1137/40/9/097005

Ground motion improvements in SPEAR3

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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.
- accelerator ,
- synchrotron ,
- radiation ,
- optics ,
- heat ,
- ground motion

References

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[4]	D. Milbert,'solid.m', unpublished
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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

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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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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Ground motion improvements in SPEAR3

Corresponding author: James A. Safranek,

Corresponding author: Yiton T. Yan,

Received Date: 2016-02-18

Available Online: 2016-09-05

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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Ground motion improvements in SPEAR3

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