Quench-Induced Degradation of the Quality Factor in Superconducting Resonators
Abstract
Quench of superconducting radio-frequency cavities frequently leads to the lowered quality factor Q0, which had been attributed to the additional trapped magnetic flux. Here we demonstrate that the origin of this magnetic flux is purely extrinsic to the cavity by showing no extra dissipation (unchanged Q0) after quenching in zero magnetic field, which allows us to rule out intrinsic mechanisms of flux trapping such as generation of thermal currents or trapping of the rf field. We also show the clear relation of dissipation introduced by quenching to the orientation of the applied magnetic field and the possibility to fully recover the quality factor by requenching in the compensated field. We discover that for larger values of the ambient field, the Q-factor degradation may become irreversible by this technique, likely due to the outward flux migration beyond the normal zone opening during quench. Lastly, our findings are of special practical importance for accelerators based on low- and medium-beta accelerating structures residing close to focusing magnets, as well as for all high-Q cavity-based accelerators.
- Authors:
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1249801
- Alternate Identifier(s):
- OSTI ID: 1254145
- Report Number(s):
- arXiv:1605.00272; FERMILAB-PUB-16-087-TD
Journal ID: ISSN 2331-7019; PRAHB2; 044019
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Applied
- Additional Journal Information:
- Journal Name: Physical Review Applied Journal Volume: 5 Journal Issue: 4; Journal ID: ISSN 2331-7019
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS
Citation Formats
Checchin, M., Martinello, M., Romanenko, A., Grassellino, A., Sergatskov, D. A., Posen, S., Melnychuk, O., and Zasadzinski, J. F. Quench-Induced Degradation of the Quality Factor in Superconducting Resonators. United States: N. p., 2016.
Web. doi:10.1103/PhysRevApplied.5.044019.
Checchin, M., Martinello, M., Romanenko, A., Grassellino, A., Sergatskov, D. A., Posen, S., Melnychuk, O., & Zasadzinski, J. F. Quench-Induced Degradation of the Quality Factor in Superconducting Resonators. United States. https://doi.org/10.1103/PhysRevApplied.5.044019
Checchin, M., Martinello, M., Romanenko, A., Grassellino, A., Sergatskov, D. A., Posen, S., Melnychuk, O., and Zasadzinski, J. F. Thu .
"Quench-Induced Degradation of the Quality Factor in Superconducting Resonators". United States. https://doi.org/10.1103/PhysRevApplied.5.044019.
@article{osti_1249801,
title = {Quench-Induced Degradation of the Quality Factor in Superconducting Resonators},
author = {Checchin, M. and Martinello, M. and Romanenko, A. and Grassellino, A. and Sergatskov, D. A. and Posen, S. and Melnychuk, O. and Zasadzinski, J. F.},
abstractNote = {Quench of superconducting radio-frequency cavities frequently leads to the lowered quality factor Q0, which had been attributed to the additional trapped magnetic flux. Here we demonstrate that the origin of this magnetic flux is purely extrinsic to the cavity by showing no extra dissipation (unchanged Q0) after quenching in zero magnetic field, which allows us to rule out intrinsic mechanisms of flux trapping such as generation of thermal currents or trapping of the rf field. We also show the clear relation of dissipation introduced by quenching to the orientation of the applied magnetic field and the possibility to fully recover the quality factor by requenching in the compensated field. We discover that for larger values of the ambient field, the Q-factor degradation may become irreversible by this technique, likely due to the outward flux migration beyond the normal zone opening during quench. Lastly, our findings are of special practical importance for accelerators based on low- and medium-beta accelerating structures residing close to focusing magnets, as well as for all high-Q cavity-based accelerators.},
doi = {10.1103/PhysRevApplied.5.044019},
journal = {Physical Review Applied},
number = 4,
volume = 5,
place = {United States},
year = {Thu Apr 28 00:00:00 EDT 2016},
month = {Thu Apr 28 00:00:00 EDT 2016}
}
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https://doi.org/10.1103/PhysRevApplied.5.044019
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Works referencing / citing this record:
Theory of RF superconductivity for resonant cavities
journal, January 2017
- Gurevich, Alex
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