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RIS citation export for MOPTEV009: A Method for In-Situ Q₀ Measurements of High-Quality SRF Resonators

AU  - Kuzikov, S.V.
AU  - Avrakhov, P.V.
AU  - Jing, C.-J.
AU  - Kostin, R.A.
AU  - Powers, T.
AU  - Rimmer, R.A.
AU  - Yakovlev, V.P.
AU  - Zhao, Y.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Lesage, Ana
ED  - Schaa, Volker R.W.
TI  - A Method for In-Situ Q₀ Measurements of High-Quality SRF Resonators
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  - Accelerator projects such as LCLS-II naturally require low-loss superconducting (SRF) cavities. Due to strong demand for improving intrinsic quality factor (Q₀), importance of accurate cavity characterization increases. We propose a method to measure Q₀ in situ for an SRF resonator installed in its cryogenic module and connected with a RF feed source via a fixed RF coupler. The method exploits measurements of a response for an SRF resonator fed by an amplitude-modulated signal. Such a signal can be synthesized as a beat-wave composed of two frequencies that are close to the resonant frequency. Analyzing the envelope of the reflected signal, one can find the difference in reflection for the chosen frequencies and use them to compute the intrinsic Q. We also develop the methodology to carry out measurements of Q₀ at the nominal cavity operating voltage. We verified our method in experiments with a room temperature copper resonator and with two SRF resonators including Fermilab’s 650 MHz cavity and JLab’s 1500 MHz cavity.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 221
EP  - 225
KW  - beat-wave
KW  - cavity
KW  - resonance
KW  - experiment
DA  - 2022/10
PY  - 2022
SN  - 2673-5504
SN  - 978-3-95450-233-2
DO  - doi:10.18429/JACoW-SRF2021-MOPTEV009
UR  - https://jacow.org/srf2021/papers/moptev009.pdf
ER  -