Measurement and Analysis of Movement of BPM Vacuum Chamber for HLS

CAO Yong; SUN Bao-Gen; HE Duo-Hui; LI Jian-Wei; LI Chuan; XUAN Ke; WANG Ji-Gang; LU Ping

Chinese Physics C> 2008, Vol. 32> Issue(S1) : 127-129

Measurement and Analysis of Movement of BPM Vacuum Chamber for HLS

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Abstract：
The beam horizontal orbit at Hefei Light Source (HLS) was drifting all along while the storage ring was operating. To study this phenomenon, the displacement and the temperature variation of the BPM chamber were measured. By analyzing the measurement results, the main reason that explained the drifting phenomenon was found. The vacuum chamber following the dipole magnets was heated by the synchrotron light, which caused the increasing of the chamber surface temperature. The variation of the chamber temperature was
the main reason why the BPM chamber held the horizontal displacement. To suppress the orbit drifting, a compensation method of BPM movement was proposed and its experimental results were given.

References

[1]

. XUAN Ke et al. Journal of University Science and Technology of China, 2007, 37(4-5): 497-499(in Chinese)2. Tsai Z D, Lee D S et al. The Effect of Improving The Temperature Variation At The SRRC Storage Ring. Pro-ceedings of EPAC 2000. Vienna: 2000. 2483-24853. Tejima M, Arinaga M et al. Movement of BPMS DueTo Thermal Stress In KEKB. Proceedings of PAC 2005. Knoxville: 2005. 3253-32554. Safranek J, Singh O et al. Orbit Stability Improvement At The NSLS X-Ray Ring. Proceedings of PAC 1995. Dallas: 1995. 2711-27135. GUO W Q et al. High Power Laser and Particle Beams, 2006, 18(12): 2074-2077(in Chinese)(郭卫群等. 强激光与粒子束, 2006, 18(12): 2074-2077)6. CAO Y. Thesis for Doctor Degree. Hefei: Published byUniversity of Science and Technology of China, 2007(in Chinese)(曹涌. 博士论文. 合肥: 中国科学技术大学出版, 2007)

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CAO Yong, SUN Bao-Gen, HE Duo-Hui, LI Jian-Wei, LI Chuan, XUAN Ke, WANG Ji-Gang and LU Ping. Measurement and Analysis of Movement of BPM Vacuum Chamber for HLS[J]. Chinese Physics C, 2008, 32(S1): 127-129.

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Received: 2008-01-10
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Measurement and Analysis of Movement of BPM Vacuum Chamber for HLS

Corresponding author: CAO Yong,

Received Date: 2008-01-10
Accepted Date: 1900-01-01
Available Online: 2008-01-04

Abstract: The beam horizontal orbit at Hefei Light Source (HLS) was drifting all along while the storage ring was operating. To study this phenomenon, the displacement and the temperature variation of the BPM chamber were measured. By analyzing the measurement results, the main reason that explained the drifting phenomenon was found. The vacuum chamber following the dipole magnets was heated by the synchrotron light, which caused the increasing of the chamber surface temperature. The variation of the chamber temperature was
the main reason why the BPM chamber held the horizontal displacement. To suppress the orbit drifting, a compensation method of BPM movement was proposed and its experimental results were given.