| Title |
The Joint High Q0 R&D Program for LCLS-II |
| Authors |
- M. Liepe, R.G. Eichhorn, F. Furuta, G.M. Ge, D. Gonnellapresenter, 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
|
| Abstract |
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.
|
| Paper |
download WEPRI062.PDF [1.043 MB / 4 pages] |
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| Conference |
IPAC2014, Dresden, Germany |
| Series |
International Particle Accelerator Conference (5th) |
| Proceedings |
Link to full IPAC2014 Proccedings |
| Session |
Poster Session, Ribery Area |
| Date |
18-Jun-14 16:00–18:00 |
| Main Classification |
07 Accelerator Technology Main Systems |
| Sub Classification |
T07 Superconducting RF |
| Keywords |
cavity, cryomodule, linac, SRF, factory |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editors |
Christine Petit-Jean-Genaz (CERN, Geneva, Switzerland); Gianluigi Arduini (CERN, Geneva, Switzerland); Peter Michel (HZDR, Dresden, Germany); Volker RW Schaa (GSI, Darmstadt, Germany) |
| ISBN |
978-3-95450-132-8 |
| Published |
July 2014 |
| Copyright |
|
