Author: Clarke, J.A.
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TUP1WA03
 Free-Electron Laser R&D in the UK - Steps Towards a National X-FEL Facility  
 
  • N. Thompson, J.A. Clarke, D.J. Dunning
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • J.A. Clarke, D.J. Dunning
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • B.W.J. MᶜNeil
    USTRAT/SUPA, Glasgow, United Kingdom
  
  In this contribution we present highlights of FEL R&D in the UK with a focus on progress towards a national X-Ray FEL user facility. We discuss the aims and status of CLARA, a dedicated FEL test facility under construction at STFC Daresbury Laboratory and present highlights of recent research into the development of novel FEL output possibilities.  
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THA1WA04
 A Staged, Multi-User X-Ray Free Electron Laser & Nuclear Physics Facility Based on a Multi-Pass Recirculating Superconducting CW Linac  
 
  • P.H. Williams, D. Angal-Kalinin, A.D. Brynes, J.A. Clarke, L.S. Cowie, D.J. Dunning, P. Goudket, F. Jackson, J.K. Jones, P.A. McIntosh, B.L. Militsyn, A.J. Moss, B.D. Muratori, S.L. Smith, M. Surman, N. Thompson, A.E. Wheelhouse
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • J.A.G. Akkermans
    ASML Netherlands B.V., Veldhoven, The Netherlands
  • D. Angal-Kalinin, I.R. Bailey, A.D. Brynes, J.A. Clarke, L.S. Cowie, D.J. Dunning, P. Goudket, F. Jackson, J.K. Jones, P.A. McIntosh, B.W.J. MᶜNeil, B.L. Militsyn, A.J. Moss, B.D. Muratori, H.L. Owen, S.L. Smith, M. Surman, N. Thompson, A.E. Wheelhouse, P.H. Williams
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • I.R. Bailey
    Lancaster University, Lancaster, United Kingdom
  • S.V. Benson, D. Douglas, Y. Roblin, T. Satogata, M. F. Spata, C. Tennant
    JLab, Newport News, Virginia, USA
  • T.K. Charles
    The University of Melbourne, Melbourne, Victoria, Australia
  • T.K. Charles
    CERN, Geneva, Switzerland
  • B.W.J. MᶜNeil
    USTRAT/SUPA, Glasgow, United Kingdom
  • H.L. Owen
    UMAN, Manchester, United Kingdom
  • R.C. York
    FRIB, East Lansing, Michigan, USA
  
  A multi-pass recirculating superconducting CW linac offers a cost effective path to a multi-user facility with unprecedented scientific and industrial reach over a wide range of disciplines. We propose such a facility to be constructed in stages. The first stage constitutes an option for a potential UK-XFEL; the linac will simultaneously drive a suite of short wavelength Free Electron Lasers (FELs) capable of providing high average power (MHz repetition rate) at up to 10 keV photons and high pulse energy (3 mJ) 25 keV photons. The system architecture is chosen to enable additional coherent sources at longer wavelengths, depending on community need. In later stages the scope of the project expands; we propose beam transport modifications to enable operation in Energy Recovery mode. This enables multi-MHz FEL sources, e.g. an X-ray FEL oscillator. Combining with lasers and / or self-interaction will provide access to MeV and GeV gamma-rays via inverse Compton scattering at high average power. Opportunities are also created for internal target and fixed target experiments. We explore possible system architectures and outline a path to confirm feasibility through experiments.  
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WEP1WC02 CompactLight Design Study 85
 
  • A. Latina, D. Schulte, S. Stapnes, W. Wuensch
    CERN, Geneva, Switzerland
  • M. Aicheler
    HIP, University of Helsinki, Finland
  • A.A. Aksoy
    Ankara University Institute of Accelerator Technologies, Golbasi, Turkey
  • A. Bernhard
    KIT, Karlsruhe, Germany
  • J.A. Clarke
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • A.W. Cross
    USTRAT/SUPA, Glasgow, United Kingdom
  • G. D'Auria, R. Geometrante
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • R.T. Dowd
    AS - ANSTO, Clayton, Australia
  • D. Esperante Pereira
    IFIC, Valencia, Spain
  • W. Fang
    SINAP, Shanghai, People's Republic of China
  • A. Faus-Golfe
    LAL, Orsay, France
  • M. Ferrario
    INFN/LNF, Frascati (Roma), Italy
  • E.N. Gazis
    National Technical University of Athens, Athens, Greece
  • R. Geometrante
    KYMA, Trieste, Italy
  • M. Jacewicz
    Uppsala University, Uppsala, Sweden
  • A. Mostacci
    Sapienza University of Rome, Rome, Italy
  • F. Nguyen
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • F. Pérez
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  • J.M.A. Priem
    VDL ETG, Eindhoven, The Netherlands
  • T. Schmidt
    PSI, Villigen PSI, Switzerland
  
  H2020 CompactLight Project aims at designing the next generation of compact hard X-Rays Free-Electron Lasers, relying on very high accelerating gradients and on novel undulator concepts. CompactLight intends to design a compact Hard X-ray FEL facility based on very high-gradient acceleration in the X band of frequencies, on a very bright photo injector, and on short-period/superconductive undulators to enable smaller electron beam energy. If compared to existing facilities, the proposed facility will benefit from a lower electron beam energy, due to the enhanced undulators performance, be significantly more compact, as a consequence both of the lower energy and of the high-gradient X-band structures, have lower electrical power demand and a smaller footprint. CompactLight is a consortium of 24 institutes (21 European + 3 extra Europeans), gathering the world-leading experts both in the domains of X-band acceleration and undulator design.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP1WC02  
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THP2WD02
 Optimisation of Superconducting Undulators for X-ray FELs  
 
  • J.A. Clarke
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  When superconducting undulators (SCUs) are optimised specifically for Free Electron Lasers (FELs) rather than storage rings a number of interesting implications emerge. In particular these relate to the vacuum requirement, the heat deposition within the SCU due to wakefield effects, and the undulator geometry itself. The impact of these considerations is that the peak field level achievable in an SCU specifically optimised for an FEL is significantly enhanced. For example, a planar SCU, utilising NbTi, with a 15mm period and 5mm aperture optimised for an FEL instead of a storage ring will generate a peak field of 2.1T compared to 1.4T. This radical increase in undulator performance will have a major impact on the optimisation of future X-ray FELs. This paper describes how an SCU for an X-ray FEL will be able to generate magnetic field levels far beyond those currently foreseen by any other magnet technology. It will also describe the prototype SCU being assembled now in the UK and the planned demonstration with beam on the CLARA test accelerator in early 2018.  
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