| Title |
Characterization of Microphonics in the cERL Main Linac Superconducting Cavities |
| Authors |
- F. Qiu, D.A. Arakawa, M. Egi, E. Kako, H. Katagiri, T. Konomi, T. Matsumoto, S. Michizono, T. Miura, H. Sakai, K. Umemori
KEK, Ibaraki, Japan
- M. Egi, S. Michizono
Sokendai - Hayama, Hayama, Japan
- E. Kako, T. Konomi, T. Matsumoto, T. Miura, F. Qiu, H. Sakai, K. Umemori
Sokendai, Ibaraki, Japan
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| Abstract |
In the main linac (ML) of the KEK-cERL, two superconducting cavities with high loaded Q (QL ¿ 1×107) are operated in continuous wave (CW) mode. It is important to control and suppress the microphonics detuning owing to the low bandwidth of the cavities. We evaluated the background microphonics detuning by the low level radio frequency system during the beam operation. Interestingly, a ¿field level dependence microphonics¿ phenomenon was observed on one of the cavities in the ML. Several frequency components were suddenly excited if the cavity field is above a threshold field (~3 MV/m). We found that this threshold field is probably related with the cavity quench limits despite the unclear inherent physical mechanism. Furthermore, in order to optimize the cavity resonance control system for better microphonics rejection, we have measured the mechanical transfer function between the fast piezo tuner and cavity detuning. Finally, we validated this model by comparing the model response with actual system response.
|
| Paper |
download TUCOZBS04.PDF [0.524 MB / 4 pages] |
| Slides |
download TUCOZBS04_TALK.PDF [7.560 MB] |
| Export |
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| Conference |
ERL2019 |
| Series |
ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs (63rd) |
| Location |
Berlin, Germany |
| Date |
15-20 September 2019 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Atoosa Meseck (HZB, Berlin, Germany); Meghan McAteer (HZB, Berlin, Germany); Volker R.W. Schaa (GSI, Darmstadt, Germany); Jens V\xF6lker (HZB, Berlin, Germany) |
| Online ISBN |
978-3-95450-217-2 |
| Received |
13 September 2019 |
| Accepted |
01 November 2019 |
| Issue Date |
24 June 2020 |
| DOI |
doi:10.18429/JACoW-ERL2019-TUCOZBS04 |
| Pages |
48-51 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
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