Author: Friscic, I.     [Friščić, I.]
Paper Title Page
TUIACC001 LERF - New Life for the Jefferson Lab FEL 45
 
  • C. Tennant, S.V. Benson, J.R. Boyce, J.L. Coleman, D. Douglas, S.L. Frierson, J. Gubeli, C. Hernandez-Garcia, K. Jordan, C. Keith, R.A. Legg, M.D. McCaughan, T. Satogata, M. Spata, M.G. Tiefenback, S. Zhang
    JLab, Newport News, Virginia, USA
  • R. Alarcon, D. Blyth, R.A. Dipert, L. Ice, G. Randall, B.N. Thorpe
    Arizona State University, Tempe, USA
  • J. Balewski, J.C. Bernauer, J.C. Bessuille, R. Corliss, R.F. Cowan, C. Epstein, P.F. Fisher, I. Friščić, D.K. Hasell, E. Ihloff, J. Kelsey, Y.-J. Lee, R. Milner, P. Moran, D. Palumbo, S. Steadman, C. Tschalär, C. Vidal, Y. Wang
    MIT, Cambridge, Massachusetts, USA
  • T. Cao, B. Dongwi, P. Guèye, N. Kalantarians, M. Kohl, A. Liyanage, J. Nazeer
    Hampton University, Hampton, Virginia, USA
  • R. Cervantes, A. Deshpande, N. Feege
    Stony Brook University, Stony Brook, USA
  • K. Dehmelt
    SUNY SB, Stony Brook, New York, USA
  • P.E. Evtushenko
    HZDR, Dresden, Germany
  • M. Garçon
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  • B. Surrow
    Temple University, Philadelphia, USA
 
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
In 2012 Jefferson Laboratory's energy recovery linac (ERL) driven Free Electron Laser successful completed a transmission test in which high current CW beam (4.3 mA at 100 MeV) was transported through a 2 mm aperture for 7 hours with beam losses as low as 3 ppm. The purpose of the run was to mimic an internal gas target for DarkLight* - an experiment designed to search for a dark matter particle. The ERL was not run again until late 2015 for a brief re-commissioning in preparation for the next phase of DarkLight. In the intervening years, the FEL was rebranded as the Low Energy Recirculator Facility (LERF), while organizationally the FEL division was absorbed into the Accelerator division. In 2016 several weeks of operation were allocated to configure the machine for Darklight with the purpose of exercising - for the first time - an internal gas target in an ERL. Despite a number of challenges, including the inability to energy recover, beam was delivered to a target of thickness 1018 cm-2 which represents a 3 order of magnitude increase in thickness from previous internal target experiments. Details of the machine configuration and operational experience will be discussed.
* J. Balewski et al., A Proposal for the DarkLight Experiment at the Jefferson Laboratory Free Electron Laser, May 2012.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2017-TUIACC001  
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