Parasitic mode loss measurement in BEPCⅡ e<sup>-</sup> ring

Wang Honglei; Wang Muyuan; Yang Jisen; Sha Peng; Lin Haiying; Ma Qiang; Wang Qunyao; Mi Zhenghui; Dai Jianping; Sun Yi; Wang Guangwei; Pan Weimin

doi:10.11884/HPLPB201931.190064

Volume 31 Issue 8

Aug. 2019

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Article Navigation > High Power Laser and Particle Beams > 2019 > 31(8): 085102

Wang Honglei, Wang Muyuan, Yang Jisen, et al. Parasitic mode loss measurement in BEPCⅡ e- ring[J]. High Power Laser and Particle Beams, 2019, 31: 085102. doi: 10.11884/HPLPB201931.190064

Citation:

Wang Honglei, Wang Muyuan, Yang Jisen, et al. Parasitic mode loss measurement in BEPCⅡ e^- ring[J]. High Power Laser and Particle Beams, 2019, 31: 085102. doi: 10.11884/HPLPB201931.190064

Wang Honglei, Wang Muyuan, Yang Jisen, et al. Parasitic mode loss measurement in BEPCⅡ e- ring[J]. High Power Laser and Particle Beams, 2019, 31: 085102. doi: 10.11884/HPLPB201931.190064

Citation:

Wang Honglei, Wang Muyuan, Yang Jisen, et al. Parasitic mode loss measurement in BEPCⅡ e^- ring[J]. High Power Laser and Particle Beams, 2019, 31: 085102. doi: 10.11884/HPLPB201931.190064

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Parasitic mode loss measurement in BEPCⅡ e^- ring

doi: 10.11884/HPLPB201931.190064

Wang Honglei^{1, 2
,},
Wang Muyuan²,
Yang Jisen^{1, 2},
Sha Peng²,
Lin Haiying²,
Ma Qiang²,
Wang Qunyao²,
Mi Zhenghui²,
Dai Jianping^{1, 2},
Sun Yi^{1, 2},
Wang Guangwei²,
Pan Weimin^{1, 2}

1.
University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Particle Acceleration Physics and Technology, Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2019-03-07
Rev Recd Date: 2019-04-10
Publish Date: 2019-08-15

Abstract

Abstract

In the design phase of BEPCII, the impedance is limited in terms of beam instabilities and parasitic mode loss. However, the parasitic mode loss has been one of the unfavorable factors affecting high beam current operation of BEPCII. This paper describes a measurement of the parasitic mode loss in BEPCII e^- ring, which is based on a small change of synchronous phase shift with beam current, the beam power measurement and the power of higher order mode absorber. The measurement results with two different methods of the total parasitic mode loss are repetitive and reliable. Moreover, the total parasitic mode loss of e^- ring is 4-5 times as large as the parasitic mode loss of the superconducting cavity.
- parasitic mode loss,
- synchronous phase shift,
- beam power,
- higher order mode

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References(10)

References

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