Jefferson Lab has developed a prototype of the medium beta SNS cryomodule. Tests were recently performed on the module, which includes three 805 MHz cavities of beta=0.61, with coaxial power couplers and frequency tuners (mechanical and piezoelectric). The cavities exceeded accelerating gradients of 16 MV/m (design value 10.5 MV/m) with Q₀'s of about 10¹⁰ at the design field. One of the power couplers has been tested up to peak powers of over 700 kW. Results of the tests are reported in this paper. Supported by US DOE Contract Nos. DE-AC05-00OR22725 and DE-AC05-84ER40150.

Authors: I.E. Campisi, G. Ciovati, E. Daly, K. Davis, J.R. Delayen, M. Drury, P. Kneisel, J. Mammosser, T. Powers, J. Preble, C.E. Reece, M. Stirbet, H. Wang, K. Wilson (Jefferson Lab), S. Smee (SNS)

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