| Title |
Measurements of Copper RF Surface Resistance at Cryogenic Temperatures for Applications to X-Band and S-Band Accelerators |
| Authors |
- A.D. Cahill, A. Fukasawa, J.B. Rosenzweig
UCLA, Los Angeles, California, USA
- G.B. Bowden, V.A. Dolgashev, M.A. Franzipresenter, S.G. Tantawi, P.B. Welander, C. Yoneda
SLAC, Menlo Park, California, USA
- J. Guo
JLab, Newport News, Virginia, USA
- Y. Higashi
OIST, Onna-son, Okinawa, Japan
|
| Abstract |
Recent SLAC experiments with cryogenically cooled X-Band standing wave copper accelerating cavities have shown that these structures can operate with accelerating gradients of ~250 MV/m and low breakdown rates. These results prompted us to perform systematic studies of copper rf properties at cryogenic temperatures and low rf power. We placed copper cavities into a cryostat cooled by a pulse tube cryocooler, so cavities could be cooled to 4K. We used different shapes of cavities for the X-Band and S-Band measurements. Properties of the cavities were measured using a network analyzer. We calculated rf surface resistance from measured Q0 and Q external of the cavity at temperatures from 4 K to room temperature. The results were then compared to the theory proposed by Reuter and Sondheimer. These measurements are a part of studies with the goal of reaching very high operational accelerating gradients in normal conducting rf structures.
|
| Funding |
Funding from DOE SCGSR and DOE/SU Contract DE-AC02-76-SF00515 |
| Paper |
download MOPMW038.PDF [0.622 MB / 4 pages] |
| Export |
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| Conference |
IPAC2016, Busan, Korea |
| Series |
International Particle Accelerator Conference (7th) |
| Proceedings |
Link to full IPAC2016 Proccedings |
| Session |
Poster Session |
| Date |
09-May-16 16:00–18:00 |
| Main Classification |
07 Accelerator Technology |
| Sub Classification |
T06 Room Temperature RF |
| Keywords |
cavity, cryogenics, experiment, electron, coupling |
| Publisher |
JACoW, Geneva, Switzerland |
| Editors |
Christine Petit-Jean-Genaz (CERN, Geneva, Switzerland); Dong Eon Kim (PAL, Pohang, Republic of Korea); Kyung Sook Kim (PAL, Pohang, Republic of Korea); In Soo Ko (POSTECH, Pohang, Republic of Korea); Volker RW Schaa (GSI, Darmstadt, Germany) |
| ISBN |
978-3-95450-147-2 |
| Published |
June 2016 |
| Copyright |
|
