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Preble, J.P.

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.

TUP028 Status of High Current R&D Energy Recovery Linac at Brookhaven National Laboratory 453
  • A. Kayran, D. Beavis, I. Ben-Zvi, M. Blaskiewicz, J.M. Brennan, A. Burrill, R. Calaga, P. Cameron, X. Chang, K.A. Drees, G. Ganetis, D.M. Gassner, J.G. Grimes, H. Hahn, L.R. Hammons, A. Hershcovitch, H.-C. Hseuh, A.K. Jain, R.F. Lambiase, D.L. Lederle, V. Litvinenko, G.J. Mahler, G.T. McIntyre, W. Meng, T.C. Nehring, B. Oerter, C. Pai, D. Pate, D. Phillips, E. Pozdeyev, T. Rao, J. Reich, T. Roser, T. Russo, Z. Segalov, A.K. Sharma, J. Smedley, K. Smith, T. Srinivasan-Rao, J.E. Tuozzolo, G. Wang, D. Weiss, N. Williams, Q. Wu, K. Yip, A. Zaltsman
    BNL, Upton, Long Island, New York
  • H. Bluem, M.D. Cole, A.J. Favale, D. Holmes, J. Rathke, T. Schultheiss, A.M.M. Todd
    AES, Medford, NY
  • J.R. Delayen, L.W. Funk, H.L. Phillips, J.P. Preble
    JLAB, Newport News, Virginia

Funding: Work performed under contract No. DE-AC02-98CH10886 with the auspices of the DoE of United States.
An ampere class 20 MeV superconducting Energy Recovery Linac (ERL) is under construction at Brookhaven National Laboratory (BNL) for testing concepts for high-energy electron cooling and electron-ion colliders. One of the goals is to demonstrate an electron beam with high charge per bunch (~5 nC) and extremely low normalized emittance (~5 mm-mrad) at an energy of 20 MeV. Flexible lattice of ERL loop provides a test-bed for testing issues of transverse and longitudinal instabilities and diagnostics of intense cw e-beam. The superconducting 703 MHz rf photoinjector is considered as an electron source for such a facility. At first we develop the straight pass (gun – 5 cell cavity – beam stop) test for the SRF Gun performance studies. Then the novel injection line concept of emittance preservation at the lower energy will be tested at this ERL. In this paper we present the status and our plans for construction and commissioning of this facility.