The Jefferson Laboratory Energy Upgrade to 12 GeV will be accomplished by designing a new cryomodule with an increase in effective length of 40 percent while maintaining the same nominal cryomodule slot length within the linac. This is being achieved by c hanging from an eight five-cell cavity structure to an eight seven-cell cavity structure and removing all bellows between the cavities along the beamline. This approach has presented significant challenges with respect to the design as it pertains to the cooldown, support, alignment and tuning criteria. The solutions to these design challenges will be presented with an emphasis on cavity operational criteria along with the integrated support components to include higher order mode couplers,fundamental pow er couplers and tuning accommodations for a one-hertz resolution.

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

Authors: J. Hogan, R. Campisi, J. Delayen, R. Getz, A. Guerra, J. Henry, P. Kneisel, J. Mammosser, L. Phillips, J. Preble, W. Schneider, K. Smith, L. Takacs, L. Turlington, M. Wiseman

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

Updated March 28, 2001

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