Broadband impedance calculations and single bunch instabilities estimations of of the HLS-II storage ring

ZHANG Qing-Kun; WANG Lin; LI Wei-Min; GAO Wei-Wei

doi:10.1088/1674-1137/39/12/127004

Chinese Physics C> 2015, Vol. 39> Issue(12) : 127004 DOI: 10.1088/1674-1137/39/12/127004

Broadband impedance calculations and single bunch instabilities estimations of of the HLS-II storage ring

1.
NSRL, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, China

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Abstract：
The upgrade project of the Hefei Light Source storage ring is under way. In this paper, the broadband impedances of resistive wall and coated ceramic vacuum chamber are calculated using the analytic formula, and the wake fields and impedances of other designed vacuum chambers are simulated by CST code, and then a broadband impedance model is obtained. Using the theoretical formula, longitudinal and transverse single bunch instabilities are discussed. With the carefully-designed vacuum chamber, we find that the thresholds of the beam instabilities are higher than the beam current goal.
- wake fields ,
- broadband impedance ,
- CST ,
- single bunch instabilities

References

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ZHANG Qing-Kun, WANG Lin, LI Wei-Min and GAO Wei-Wei. Broadband impedance calculations and single bunch instabilities estimations of of the HLS-II storage ring[J]. Chinese Physics C, 2015, 39(12): 127004. doi: 10.1088/1674-1137/39/12/127004

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Received: 2015-04-27

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Supported by Natural Science Foundation of China (11175182, 11175180)

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Broadband impedance calculations and single bunch instabilities estimations of of the HLS-II storage ring

Corresponding author: ZHANG Qing-Kun,

Corresponding author: WANG Lin,

Corresponding author: LI Wei-Min,

Corresponding author: GAO Wei-Wei,

1. NSRL, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, China

Received Date: 2015-04-27

Available Online: 2015-12-20

Fund Project: Supported by Natural Science Foundation of China (11175182, 11175180)

Abstract: The upgrade project of the Hefei Light Source storage ring is under way. In this paper, the broadband impedances of resistive wall and coated ceramic vacuum chamber are calculated using the analytic formula, and the wake fields and impedances of other designed vacuum chambers are simulated by CST code, and then a broadband impedance model is obtained. Using the theoretical formula, longitudinal and transverse single bunch instabilities are discussed. With the carefully-designed vacuum chamber, we find that the thresholds of the beam instabilities are higher than the beam current goal.

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Broadband impedance calculations and single bunch instabilities estimations of of the HLS-II storage ring

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