Beam based alignment of the SSRF storage ring

ZHANG Man-Zhou; LI Hao-Hu; JIANG Bo-Cheng; LIU Gui-Min; LI De-Ming

doi:10.1088/1674-1137/33/4/013

Chinese Physics C> 2009, Vol. 33> Issue(4) : 301-305 DOI: 10.1088/1674-1137/33/4/013

Beam based alignment of the SSRF storage ring

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Abstract：
There are 140 beam position monitors (BPMs) in the Shanghai Synchrotron Radiation Facility (SSRF) storage ring used for measuring the closed orbit. As the BPM pickup electrodes are assembled directly on the vacuum chamber, it is important to calibrate the electrical center offset of the BPM to an adjacent quadrupole magnetic center. A beam based alignment (BBA) method which varies individual quadrupole magnet strength and observes its effects on the orbit is used to measure the BPM offsets in both the horizontal and vertical planes. It is a completely automated technique with various data processing methods. There are several parameters such as the strength change of the correctors and the quadrupoles which should be chosen carefully in real measurement. After several rounds of BBA measurement and closed orbit correction, these offsets are set to an accuracy better than 10 μm. In this paper we present the method of beam based calibration of BPMs, the experimental results of the SSRF storage ring, and the error analysis.

References

[1]

. ZHAO Z T, XU H J. SSRF, A 3.5 GeV Synchrotron Light Source for China. In European Particle Accelerator Con-ference, Proceeding of EPAC 2004. Lucerne Switzerland:2004, 23682. Roejsel P. Nucl. Instrum. Methods A, 1994, 343: 3743. Terebilo A. Accelerator Toolbox for MATLAB, SLAC-PUB-8732, 2001, 10-35. ww-ssrl.slac.stanford.edu/at/slac-pub-8732.pdf4. Portmann J, Je Corbett, Andrei Terebilo. Middle Layer Software For Accelerator Comtrol, 2004, 10. www-ssrl.slac.stanford.edu/spear3/commissioning/middlelayersoftware.doc5. Portmann G, Robin D. Automated Beam Based Alignment of the ALS Quadrupoles. In Particle Accelerator Confer-ence, Proceedings of the 1995. Dallas, USA: 1995, 4: 26936. Tenenbaum P, Raubenheimer T O. Physical Review Special Topics - Accelerators and Beams, 2000, 3: 052801

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ZHANG Man-Zhou, LI Hao-Hu, JIANG Bo-Cheng, LIU Gui-Min and LI De-Ming. Beam based alignment of the SSRF storage ring[J]. Chinese Physics C, 2009, 33(4): 301-305. doi: 10.1088/1674-1137/33/4/013

ZHANG Man-Zhou, LI Hao-Hu, JIANG Bo-Cheng, LIU Gui-Min and LI De-Ming. Beam based alignment of the SSRF storage ring[J]. Chinese Physics C, 2009, 33(4): 301-305. doi: 10.1088/1674-1137/33/4/013 shu

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Received: 2008-05-15
Revised: 2008-06-24

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通讯作者: 陈斌, [email protected]

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沈阳化工大学材料科学与工程学院沈阳 110142

Beam based alignment of the SSRF storage ring

Corresponding author: ZHANG Man-Zhou,

Received Date: 2008-05-15

Accepted Date: 2008-06-24

Available Online: 2009-04-05

Abstract:

There are 140 beam position monitors (BPMs) in the Shanghai Synchrotron Radiation Facility (SSRF) storage ring used for measuring the closed orbit. As the BPM pickup electrodes are assembled directly on the vacuum chamber, it is important to calibrate the electrical center offset of the BPM to an adjacent quadrupole magnetic center. A beam based alignment (BBA) method which varies individual quadrupole magnet strength and observes its effects on the orbit is used to measure the BPM offsets in both the horizontal and vertical planes. It is a completely automated technique with various data processing methods. There are several parameters such as the strength change of the correctors and the quadrupoles which should be chosen carefully in real measurement. After several rounds of BBA measurement and closed orbit correction, these offsets are set to an accuracy better than 10 μm. In this paper we present the method of beam based calibration of BPMs, the experimental results of the SSRF storage ring, and the error analysis.

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Beam based alignment of the SSRF storage ring

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通讯作者: 陈斌, [email protected]

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