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Brunetti, E.

Paper Title Page
MOPE072 Electron Beam Quality Measurements on the ALPHA-X Laser-plasma Wakefield Accelerator 1146
 
  • G.H. Welsh, M.P. Anania, C. Aniculaesei, E. Brunetti, R.T.L. Burgess, S. Cipiccia, D. Clark, B. Ersfeld, M.R. Islam, R.C. Issac, D.A. Jaroszynski, G.G. Manahan, T. McCanny, G. Raj, A. J. W. Reitsma, R.P. Shanks, G. Vieux, S.M. Wiggins
    USTRAT/SUPA, Glasgow
  • W.A. Gillespie
    University of Dundee, Nethergate, Dundee, Scotland
  • M.J. Loos, S.B. van der Geer
    TUE, Eindhoven
  • A. MacLeod
    UAD, Dundee
 
 

The Advanced Laser-Plasma High-Energy Accelerators towards X-rays (ALPHA-X) programme at the University of Strathclyde is developing laser-plasma wakefield accelerators to produce high energy, ultra-short duration electron bunches as drivers of radiation sources. Coherent emission will be produced in a free-electron laser by focussing the electron bunches into an undulator. To achieve net gain, a high peak current, low energy spread and low emittance are required. A high intensity ultra-short pulse from a 30 TW Ti:sapphire laser is focussed into a helium gas jet to produce femtosecond duration electron bunches in the range of 80 - 200 MeV. Beam transport is monitored using a series of Lanex screens positioned along the beam line. We present measurements of the electron beam energy spread as low as 0.7% (at 90 MeV) obtained using a high resolution magnetic dipole spectrometer. We also present pepper-pot measurements of the normalised transverse emittance of the order of 1 pi mm mrad. With further acceleration to 1 GeV, the beam parameters indicate the feasibility of a compact X-ray FEL with a suitable undulator.

 
TUPE052 The ALPHA-X Beam Line: towards a Compact FEL 2263
 
  • M.P. Anania, E. Brunetti, S. Cipiccia, D. Clark, R.C. Issac, D.A. Jaroszynski, G.G. Manahan, T. McCanny, A. J. W. Reitsma, R.P. Shanks, G.H. Welsh, S.M. Wiggins
    USTRAT/SUPA, Glasgow
  • J.A. Clarke, M.W. Poole, B.J.A. Shepherd
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • M.J. de Loos, S.B. van der Geer
    Pulsar Physics, Eindhoven
 
 

Recent progress in developing laser-plasma accelerators is raising the possibility of a compact coherent radiation source that could be housed in a medium sized university department. Furthermore, since the duration of electron bunches from laser-plasma wakefield accelerators is determined by the relativistic plasma wavelength, radiation sources based on these accelerators can produce pulses with femtosecond durations. Beam properties from laser-plasma accelerators have been traditionally thought of as not being of sufficient quality to produce amplification. Our work shows that this is not the case. Here we present a study of the beam characteristics of a laser-plasma accelerator and the compact ALPHA-X (Advanced Laser Plasma High-energy Accelerators towards X-rays) FEL. We discuss the implementation of a focussing system consisting of a triplet of permanent magnet quadrupoles and a triplet of electromagnetic quadrupoles*. We will present a study of the influence of beam transport on FEL action in the undulator, paying particular attention to bunch dispersion in the undulator. This is an important step for developing a compact synchrotron source or a SASE free-electron laser.


*The design of these devices has been carried out using the GPT code, which considers space charge effects and allows a realistic estimate of electron beam properties along the beam line.