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    Development and Testing of a Prototype Tuner for the CEBAF Upgrade Cryomodule

    An upgrade cryomodule is being developed for CEBAF at Jefferson Lab. The high-gradient, low-current operationof the superconducting cavities puts stringent requirements on the accuracy of the frequency tuner: a resolution of 1 Hz over a range of 400 KHz. We have developed and tested such a tuner; it consists of a stepper-motor-driven coarse tuner, operating in parallel with a piezo-actuator-driven fine tuner. Tuner test procedures and results are summarized, including frequency resolution, range, and lin earity (i.e. frequency vs. tuner position), as well as microphonic effects resulting from tuner operation.

    This work was supported by U.S. DOE under contract DE-AC05-84ER40150.

    Authors: G.K. Davis, J.R. Delayen, M. Drury, E. Feldl

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

    Updated March 28, 2001



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