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RIS citation export for TUPFAV002: Calibration of SRF Cavity Voltage by Measurement of Synchrotron Frequency in SuperKEKB

AU  - Nishiwaki, M.
AU  - Akai, K.
AU  - Furuya, T.
AU  - Kobayashi, T.
AU  - Mitsunobu, S.
AU  - Morita, Y.
AU  - Okada, T.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Lesage, Ana
ED  - Schaa, Volker R.W.
TI  - Calibration of SRF Cavity Voltage by Measurement of Synchrotron Frequency in SuperKEKB
J2  - Proc. of SRF2021, East Lansing, MI, USA, 28 June-02 July 2021
CY  - East Lansing, MI, USA
T2  - International Conference on RF Superconductivity
T3  - 20
LA  - english
AB  - 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.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 376
EP  - 381
KW  - cavity
KW  - factory
KW  - operation
KW  - pick-up
DA  - 2022/10
PY  - 2022
SN  - 2673-5504
SN  - 978-3-95450-233-2
DO  - doi:10.18429/JACoW-SRF2021-TUPFAV002
UR  - https://jacow.org/srf2021/papers/tupfav002.pdf
ER  -