Niobium Quarter-Wave Resonator Development for The Rare Isotope Accelerator
Abstract
Two superconducting quarter-wave resonator (QWR) prototypes have been fabricated and tested. They operate at 80.5 MHz and 161 MHz and are optimised for beta = 0.085 and beta = 0.16, respectively. The prototypes are simplified versions without integrated helium vessels. In the first RF tests, the beta = 0.085 QWR reached a peak surface electric field (Ep) in excess of 30 MV/m, with an intrinsic quality factor (Q0) in excess of 1E9 at the design field of Ep = 20 MV/m. The beta = 0.16 QWR reached Ep = 20 MV/m with Q0 = 2.5E9. It is suspected that the performance of the latter cavity can be improved via better cooling of the Nb tuning plate and a better RF contact between the plate and the outer conductor.
- Publication:
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arXiv e-prints
- Pub Date:
- December 2004
- DOI:
- arXiv:
- arXiv:physics/0412031
- Bibcode:
- 2004physics..12031H
- Keywords:
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- Physics - Accelerator Physics
- E-Print:
- 4 pages, 6 figures, LaTeX, to be published in the proceedings of the Eleventh Workshop on RF Superconductivity