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Rothgeb, T. M.

Paper Title Page
WEPMN021 High Pressure Rinsing System Comparison 2092
 
  • D. Sertore, M. Fusetti, P. Michelato, C. Pagani
    INFN/LASA, Segrate (MI)
  • G. Ciovati, T. M. Rothgeb
    Jefferson Lab, Newport News, Virginia
  • T. Higo, J. H. Hong, K. Saito
    KEK, Ibaraki
  
  High pressure rinsing (HPR) is a key process for the surface preparation of high field superconducting cavities. A portable apparatus for the water jet characterization, based on the transferred momentum between the water jet and a load cell, has been used in different laboratories. This apparatus allows to collected quantitative parameters that characterize the HPR water jet. In this paper, we present a quantitative comparison of the different water jet produced by various nozzles routinely used in different laboratories for the HPR process  
WEPMS059 Performance of the First Refurbished CEBAF Cryomodule 2478
 
  • M. A. Drury, E. Daly, G. K. Davis, J. F. Fischer, C. Grenoble, W. R. Hicks, J. Hogan, K. King, R. Nichols, T. E. Plawski, J. P. Preble, T. M. Rothgeb, H. Wang
    Jefferson Lab, Newport News, Virginia
  
  Funding: U. S. DOE Contract No. DE-AC05-06OR23177. This manuscript has been authored by Jefferson Science Associates, LLC under U. S. DOE Contract No. DE-AC05-06OR23177.

The Thomas Jefferson National Accelerator Facility has begun 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 10 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 on 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, the first of the refurbished cryomodules has been installed and tested both in the Cryomodule Test Facility and in place in the North Linac of CEBAF. This paper will summarize the results of these tests.