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    Superconducting Prototype Cavities for the Spallation Neutron Source (SNS) Project

    The Spallation Neutron Source project includes a superconducting linac section in the energy range from 192 MeV to 1000 MeV. For this energy range two types of cavities are needed with geometrical beta - values of beta = 0.61 and beta = 0.81. An aggressive cavity prototyping program is being pursued at Jlab, which calls for fabricating and testing of four beta = 0.61 cavities and two beta = 0.81 cavities. Both types consist of six cells made from high purity niobium and feature one HOM coupler of the TESLA type on each beam pipe and a port for a high power coaxial input coupler. Three of the four beta = 0.61 cavities will be used for a cryomodule test at the end of the year 2001. At this time two cavities of each type have been fabricated and the first tests on the beta = 0.61 cavity exceeded the design values for gradient and Q - value: Eacc = 10.3 MV/m and Q = 6.5 x 109 at 2.1K. This paper will describe the cavity design with respect to electrical and mechanical features, the fabrication efforts and the results obtained with the different cavities exis ting at the time of the conference.

    This work was supported by the U.S. DOE Contract No DE-AC05-00-OR22725

    Authors: Peter Kneisel, John Brawley, Richard Bundy, Gianluigi Ciovati, Kurt Macha, Danny Machie, John Mammosser, Ron Sundelin, Larry Turlington, Katherine Wilson (Thomas Jefferson National Accelerator Facility), J. Sekutowicz (Deutsches Elektro n Synchrotron) , D. Barni, C. Pagani, R. Parodi, P. Pierini (Istituto Nazionale di Fisica Nucleare), D. Schrage (Los Alamos National Laboratory) , M. Doleans, S.H. Kim, D. Mangra (Oak Ridge National Laboratory), P. Ylae-Oijala (Univ. Helsinki)

    Abstract submitted to PAC 2001, Chicago, IL, June 18-24, 2001

    Updated May 14, 2001



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