Operation stability improvement for synchrotron light sources by tune feedback system

Xu Wu; Shunqiang Tian; Qinglei Zhang; Wenzhi Zhang

doi:10.11884/HPLPB202032.190270

Journals >High Power Laser and Particle Beams >Volume 32 >Issue 4 >Page 045107 > Article

High Power Laser and Particle Beams
Vol. 32, Issue 4, 045107 (2020)

Operation stability improvement for synchrotron light sources by tune feedback system

Xu Wu^1、2、3, Shunqiang Tian³, Qinglei Zhang³, and Wenzhi Zhang³

Author Affiliations

¹Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

²University of Chinese Academy of Sciences, Beijing 100049, China

³Shanghai Advanced Research Institute, Chinese Academy of Sciences (Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory), Shanghai 201204, China

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DOI: 10.11884/HPLPB202032.190270 Cite this Article

Xu Wu, Shunqiang Tian, Qinglei Zhang, Wenzhi Zhang. Operation stability improvement for synchrotron light sources by tune feedback system[J]. High Power Laser and Particle Beams, 2020, 32(4): 045107 Copy Citation Text

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Fig. 1. Tune feedforward effects

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Fig. 2. Beam optics and lattice for a cell

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Fig. 3. Correction currents and magnets drift

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Fig. 4. Stable operation of tune feedback

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Fig. 5. Beta-beatings

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Fig. 6. Main beam parameter variations

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parameter	design value	measured value
beam energy / GeV	3.50	3.50
circumference / m	432	---------
number of cells	20	---------
construction	DBA	---------
numbers of QF/QD in one cell	4/6	---------
beam current / mA	200−300	240
tune (H, V)	22.22, 11.29	22.220, 11.290 (±0.01)
natural emittance / nm·rad	3.89	3.9
coupling	1%	0.3%
natural chromaticity (H, V)	−55.7, −17.9	--------
corrected chromaticity (H, V)	---------	1.5, 2.5
RMS energy spread	9.845×10⁻⁴	0.001
energy loss per turn / MeV	1.435	～1.45
momentum compaction factor	4.27×10⁻⁴	4.2 ×10⁻⁴
RF voltage / MV	4.0	4～4.8
RF frequency / MHz	499.654	499.68
synchrotron frequency	0.007 2	0.007 5

Table 1. Beam parameters of the SSRF storage ring

Xu Wu, Shunqiang Tian, Qinglei Zhang, Wenzhi Zhang. Operation stability improvement for synchrotron light sources by tune feedback system[J]. High Power Laser and Particle Beams, 2020, 32(4): 045107

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