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Title: Frequency dependence of trapped flux sensitivity in SRF cavities

In this paper, we present the frequency dependence of the vortex surface resistance of bulk niobium accelerating cavities as a function of different state-of-the-art surface treatments. Higher flux surface resistance per amount of trapped magnetic field - sensitivity - is observed for higher frequencies, in agreement with our theoretical model. Higher sensitivity is observed for N-doped cavities, which possess an intermediate value of electron mean-free-path, compared to 120° C and EP/BCP cavities. Experimental results from our study showed that the sensitivity has a non-monotonic trend as a function of the mean-free-path, including at frequencies other than 1.3 GHz, and that the vortex response to the rf field can be tuned from the pinning regime to flux-flow regime by manipulating the frequency and/or the mean-free-path of the resonator, as reported in our previous studies. The frequency dependence of the trapped flux sensitivity to the amplitude of the accelerating gradient is also highlighted.
Authors:
 [1] ; ORCiD logo [1] ;  [2] ;  [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [2] ; ORCiD logo [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Northwestern Univ., Evanston, IL (United States). Department of Physics
Publication Date:
Report Number(s):
arXiv:1711.05902; FERMILAB-PUB-17-661-TD
Journal ID: ISSN 0003-6951; 1636797
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 7; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
OSTI Identifier:
1430660
Alternate Identifier(s):
OSTI ID: 1420359

Checchin, M., Martinello, M., Grassellino, A., Aderhold, S., Chandrasekaran, S. K., Melnychuk, O. S., Posen, S., Romanenko, A., and Sergatskov, D. A.. Frequency dependence of trapped flux sensitivity in SRF cavities. United States: N. p., Web. doi:10.1063/1.5016525.
Checchin, M., Martinello, M., Grassellino, A., Aderhold, S., Chandrasekaran, S. K., Melnychuk, O. S., Posen, S., Romanenko, A., & Sergatskov, D. A.. Frequency dependence of trapped flux sensitivity in SRF cavities. United States. doi:10.1063/1.5016525.
Checchin, M., Martinello, M., Grassellino, A., Aderhold, S., Chandrasekaran, S. K., Melnychuk, O. S., Posen, S., Romanenko, A., and Sergatskov, D. A.. 2018. "Frequency dependence of trapped flux sensitivity in SRF cavities". United States. doi:10.1063/1.5016525. https://www.osti.gov/servlets/purl/1430660.
@article{osti_1430660,
title = {Frequency dependence of trapped flux sensitivity in SRF cavities},
author = {Checchin, M. and Martinello, M. and Grassellino, A. and Aderhold, S. and Chandrasekaran, S. K. and Melnychuk, O. S. and Posen, S. and Romanenko, A. and Sergatskov, D. A.},
abstractNote = {In this paper, we present the frequency dependence of the vortex surface resistance of bulk niobium accelerating cavities as a function of different state-of-the-art surface treatments. Higher flux surface resistance per amount of trapped magnetic field - sensitivity - is observed for higher frequencies, in agreement with our theoretical model. Higher sensitivity is observed for N-doped cavities, which possess an intermediate value of electron mean-free-path, compared to 120° C and EP/BCP cavities. Experimental results from our study showed that the sensitivity has a non-monotonic trend as a function of the mean-free-path, including at frequencies other than 1.3 GHz, and that the vortex response to the rf field can be tuned from the pinning regime to flux-flow regime by manipulating the frequency and/or the mean-free-path of the resonator, as reported in our previous studies. The frequency dependence of the trapped flux sensitivity to the amplitude of the accelerating gradient is also highlighted.},
doi = {10.1063/1.5016525},
journal = {Applied Physics Letters},
number = 7,
volume = 112,
place = {United States},
year = {2018},
month = {2}
}