JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
@inproceedings{nishiwaki:srf2021-tupfav002,
author = {M. Nishiwaki and K. Akai and T. Furuya and T. Kobayashi and S. Mitsunobu and Y. Morita and T. Okada},
% author = {M. Nishiwaki and K. Akai and T. Furuya and T. Kobayashi and S. Mitsunobu and Y. Morita and others},
% author = {M. Nishiwaki and others},
title = {{Calibration of SRF Cavity Voltage by Measurement of Synchrotron Frequency in SuperKEKB}},
booktitle = {Proc. SRF'21},
% booktitle = {Proc. 20th International Conference on RF Superconductivity (SRF'21)},
pages = {376--381},
eid = {TUPFAV002},
language = {english},
keywords = {cavity, factory, operation, SRF, pick-up},
venue = {East Lansing, MI, USA},
series = {International Conference on RF Superconductivity},
number = {20},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2022},
issn = {2673-5504},
isbn = {978-3-95450-233-2},
doi = {10.18429/JACoW-SRF2021-TUPFAV002},
url = {https://jacow.org/srf2021/papers/tupfav002.pdf},
abstract = {{Eight SRF cavity modules, which have been operated in KEKB for more than ten years, are stably operating also in SuperKEKB. As for calibration of the cavity voltage Vc, non-negligible discrepancy was observed between the results obtained from two different methods: one is using external Q value (Q_{ext}) of pickup ports, and the other is using loaded Q value (QL) of the cavities. The discrepancy comes from inaccuracy of power measurement in high power RF system and uncertainty of the Q_{ext} or QL values. In order to solve the discrepancy by improving the accuracy of the calibration for each individual cavity, we investigated a method by measuring synchrotron frequency fs of stored beam. With this method, Vc calibration can be performed without affected by inaccuracy of high-power measurement or uncertainty of the Q_{ext} or QL values. The fs measurement studies were carried out in SuperKEKB. With these studies, Vc calibration was obtained with a high accuracy of about 1%. The results are applied to the SuperKEKB operation.}},
}