Author: Snedden, E.W.
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Terahertz-Driven Acceleration of a Relativistic Electron Beam  
  • M.T. Hibberd, V. Georgiadis, D.M. Graham
    The University of Manchester, The Photon Science Institute, Manchester, United Kingdom
  • R.B. Appleby, E.J.H. Smith
    UMAN, Manchester, United Kingdom
  • G. Burt, O.J. Finlay, A.L. Healy, S.P. Jamison, D. Lake
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • J.K. Jones, T.H. Pacey, Y.M. Saveliev, E.W. Snedden, D.A. Walsh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  Funding: Science and Technology Facilities Council (STFC)
Terahertz (THz) pulses are emerging as unique driving sources for next-generation particle accelerators, offering unprecedented control over the energy-time phase-space of a particle bunch compared with conventional radio-frequency technology. Acceleration, compression and streaking have all been demonstrated with low energy electrons* but operation at relativistic energies remains limited. Here, we report on the first demonstration of phase-velocity matched acceleration of a relativistic electron beam in a THz-driven linear accelerator**, confirmed through frequency-tuning of the THz source. Operating in the highest beam energy (35 MeV) and charge (60 pC) regimes reported to date, we use narrowband THz pulses centered at 0.4 THz to drive collinear THz-electron interaction in a dielectric-lined waveguide. We exploit multi-cycle energy modulation of a chirped 6 ps electron bunch to extract the often-inaccessible longitudinal phase-space distribution, highlighting the potential for THz-driven bunch diagnostics. We also show injection-time-dependent preferential energy gain/loss for 2 ps bunches, demonstrating a route to whole-bunch acceleration of sub-ps relativistic electron beams.
*D. Zhang et al. Nat. Photonics 12, 336 (2018).
**M.T. Hibberd et al. arXiv:1908.04055.
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Full Energy Beam Exploitation Beam Line on CLARA for Novel Applications  
  • D. Angal-Kalinin, M. Colling, J.K. Jones, E.W. Snedden
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • B.D. Fell
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • J.K. Jones
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  CLARA (Compact Linear Accelerator for Research and Applications) is a test facility for Free Electron Laser (FEL) research and other applications at Daresbury Laboratory. In order to provide full energy (250 MeV) beam to users for exploitation, a Full Energy Beam Exploitation (FEBE) line is designed to extract beam before the FEL section. The beamline consists of dogleg designed to cancel coherent synchrotron radiation (CSR) for a compressed start-to-end bunch and can also be used to compress bunch to avoid CSR blow up in the main beam line before beam is diverted to FEBE line. Following user consultation, we have developed the design to allow beam experiments combining electron beam, laser and jet target experiments. The design incorporates flexibility to re-configure experiments easily and incorporates number of diagnostics pre and post the interaction point. We present design of this beamline with tracked bunch parameters at different charges to deliver range of parameters to users.  
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