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Title LERF - New Life for the Jefferson Lab FEL
  • 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. F. 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
Abstract 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.
Footnotes & References * J. Balewski et al., A Proposal for the DarkLight Experiment at the Jefferson Laboratory Free Electron Laser, May 2012.
Funding Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
Paper download TUIACC001.PDF [0.983 MB / 4 pages]
Slides download TUIACC001_TALK.PDF [23.844 MB]
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Conference ERL2017, Geneva, Switzerland
Series ICFA Advanced Beam Dynamics Workshop (59th)
Proceedings Link to full ERL2017 Proccedings
Session WG5.2 FEL Applications A
Date 20-Jun-17   08:30–09:45
Main Classification WG5: Applications
Keywords target, operation, solenoid, linac, electron
Publisher JACoW Publishing, Geneva, Switzerland
Editors Suitbert Ramberger (CERN, Geneva, Switzerland); Mick Draper (CERN, Geneva, Switzerland); Volker RW Schaa (GSI, Darmstadt, Germany)
ISBN 978-3-95450-190-8
Published May 2018
Copyright © 2018 by JACoW, Geneva, Switzerland     CC-BY Creative Commons License
cc Creative Commons Attribution 3.0