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SRF2003 Show Abstract

Title Cold Tests of the RIA Two-Cell Spoke Cavity
Type Poster cavity design / fabrication / treatment
Abstract This paper reports recent cold tests of a two-cell 345 MHz spoke-loaded superconducting cavity built and tested for the U.S. RIA project driver linac. This cavity establishes a new performance record for lambda/2 structures. Rf surfaces were prepared using electropolish, high-pressure water rinsing and clean assembly techniques. At a realistic operating field of EACC=7 MV/m (EPEAK=24 MV/m) the cavity has a residual surface resistance of RRES=12 nOhms with minimal Q-slope even in 4 K operation. In addition the cavity operates field emission free up to EACC=12 MV/m (EPEAK=41 MV/m).  With a 3 cm aperture the cavity provides 3 MV of accelerating potential with 15 Watts of input power and useful acceleration over the velocity range 0.3c < v < 0.6c while operating at 4 K. A fully integrated stainless-steel housing with niobium-to-stainless steel braze transitions has been demonstrated and is suitable for production cavities.

List of authors...

Principle author first.

Last (Family) Name First Name (Initials only) Affiliation or Organization (abbreviations if possible)
Kelly M.P. ANL
Shepard K.W. ANL
Fuerst J.D. ANL
Kedzie M. ANL

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