Development of digital self-excited loop in vertical tests of superconducting cavity

Feng Liwen; Wang Fang; Lin Lin; Hao Jiankui

doi:10.11884/HPLPB202133.200216

Volume 33 Issue 2

Jan. 2021

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Feng Liwen, Wang Fang, Lin Lin, et al. Development of digital self-excited loop in vertical tests of superconducting cavity[J]. High Power Laser and Particle Beams, 2021, 33: 024001. doi: 10.11884/HPLPB202133.200216

Citation:

Feng Liwen, Wang Fang, Lin Lin, et al. Development of digital self-excited loop in vertical tests of superconducting cavity[J]. High Power Laser and Particle Beams, 2021, 33: 024001. doi: 10.11884/HPLPB202133.200216

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Development of digital self-excited loop in vertical tests of superconducting cavity

doi: 10.11884/HPLPB202133.200216

State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

Received Date: 2020-07-27
Rev Recd Date: 2020-10-20
Publish Date: 2021-01-07

Abstract

Abstract

Vertical tests are very important for superconducting cavity after its post-processing. The aim is to obtain the quality factor versus accelerating gradient curve to evaluate a cavity’s performance. Because of its narrow bandwidth, the superconducting cavity should work stably in the resonant state during the vertical tests. The digital self-excited loop system for the vertical test stand of Peking University is introduced in this paper. The methods of avoiding crosstalk during multi-cell superconducting cavity test were brought out. The influence of deviation from quadruple frequency sampling on amplitude and phase was analyzed. The system is stable and reliable, can effectively distinguish $ {\text{π}} $ mode from $ 8{\rm{{\text{π}}}}/9 $ mode of the 1.3 GHz 9-cell superconducting cavity, and solve the problem of mode crosstalk in multi-cell superconducting cavity test.
- superconducting cavity,
- vertical test,
- digital,
- self-excited loop

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References(11)

References

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