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Hogan, J.

Paper Title Page
THP122 Overview of the First Five Refurbished CEBAF Cryomodules 1084
 
  • M.A. Drury, E. Daly, G.K. Davis, J.F. Fischer, C. Grenoble, J. Hogan, F. Humphry, L.K. King, J.P. Preble, K. Worland
    JLAB, Newport News, Virginia
 
 

Funding: Authored by JSA, LLC under U.S. DOE Contract No. DE-AC05-06OR23177
The Thomas Jefferson National Accelerator Facility is currently engaged in a cryomodule refurbishment project. The goal of this project is robust 6 GeV, 5 pass operation of the Continuous Electron Beam Accelerator Facility (CEBAF). The scope of the project includes removing, refurbishing and replacing ten CEBAF cryomodules at a rate of three per year. Refurbishment includes reprocessing of SRF cavities to eliminate field emission and increase the nominal gradient from the original 5 MV/m to 12.5 MV/m. New 'dogleg' couplers between the cavity and helium vessel flanges will intercept secondary electrons that produce arcing at the 2 K ceramic window in the Fundamental Power Coupler (FPC). Modification of the Qext of the FPC will allow higher gradient operations. Other changes include new ceramic rf windows for the air to vacuum interface of the FPC and improvements to the mechanical tuners. Any damaged or worn components will be replaced as well. Currently, five refurbished cryomodules have been installed in CEBAF. These cryomodules have been installed in CEBAF and are currently operational. This paper will summarize the test results and current operational experience.