Paper |
Title |
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WEPRI054 |
Medium Field Q-Slope Studies in Low Beta Resonators |
2608 |
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- O.S. Melnychuk, A. Grassellino, A.I. Sukhanov
Fermilab, Batavia, Illinois, USA
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Studies of the phenomenon of Medium field Q-slope (MFQS, 30-80 mT) have been focused predominantly on high beta superconducting cavities. Complementing research on cavity losses with the analysis of low beta cavity data can provide additional insights into the nature of MFQS. We present MFQS measurements of 325MHz β=0.2 single spoke resonators and 650MHz β=0.9 elliptical single cell resonators at vertical test facility at FNAL. We compare our findings with those obtained for high frequency 1.3GHz cavities tested both at the same facility and other laboratories.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI054
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WEPRI062 |
The Joint High Q0 R&D Program for LCLS-II |
2627 |
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- M. Liepe, R.G. Eichhorn, F. Furuta, G.M. Ge, D. Gonnella, G.H. Hoffstaetter
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
- A.C. Crawford, A. Grassellino, A. Hocker, O.S. Melnychuk, A. Romanenko, A.M. Rowe, D.A. Sergatskov
Fermilab, Batavia, Illinois, USA
- R.L. Geng, A.D. Palczewski, C.E. Reece
JLab, Newport News, Virginia, USA
- M.C. Ross
SLAC, Menlo Park, California, USA
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The superconducting RF linac for LCLS-II calls for 1.3 GHz 9-cell cavities with an average intrinsic quality factor Q0 of 2.7·1010 at 2K and 16 MV/m accelerating gradient. A collaborative effort between Cornell University, FNAL, and JLab has been set up with the goal of developing and demonstrating a cavity treatment protocol for the LCLS-II cavities meeting these specifications. The high Q0 treatment protocol is based on nitrogen doping of the RF surface layer during a high temperature heat treatment. This novel SRF cavity preparation was recently developed at FNAL and shown to result in SRF cavities of very high Q0 at 2K with an increase in Q0 from low to medium fields. N-doped single cell cavities at Cornell, FNAL, and JLab routinely exceed LCLS-II specification. 9-cell N-doped cavities at FNAL achieve an average Q0(T=2K, 16 MV/m) of ≈ 3.4·1010 with an average quench field of ≈ 19 MV/m, meeting therefore overall with good margin the LCLS-II specification.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI062
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Export • |
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※ LaTeX,
※ Text/Word,
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