Electron beam quality measurements on the ALPHA-X laser-plasma wakefield accelerator

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, G. G. Manahan, T. McCanny, G. Raj, A. J. W. Reitsma, R. P. Shanks, G. Vieux, S. M. Wiggins, D. A. Jaroszynski, W. A. Gillespie, A. M. MacLeodS. B. van der Geer, M. J. de Loos

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    Abstract

    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 ultra-short electron bunches into an undulator. To achieve net gain, 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. Measurements of the electron energy spectrum, obtained using the ALPHA-X high resolution magnetic dipole spectrometer, are presented. The maximum central energy of the monoenergetic beam is 90 MeV and r.m.s. relative energy spreads as low as 0.8% are measured. The mean central energy is 82 ± 4 MeV and mean energy spread is 1.1 ± 0.4%. We also present pepper-pot measurements of the normalised transverse emittance where mono-energetic electrons are passed through an array of 52µm diameter holes in tungsten. The analysis of the pepper-pot results sets an upper limit for the normalised emittance at 5.5 ± 1π mm mrad for an 82 MeV beam. With further acceleration to 1 GeV, the relative energy spread will reduce giving beam parameters that indicate the feasibility of a compact X-ray FEL driven by a plasma-wakefield accelerator.
    Original languageEnglish
    Title of host publicationProceedings of the first International Particle Accelerator Conference (IPAC’10), Kyoto, 23-28 May 2010
    Pages1146-1148
    Number of pages3
    Publication statusPublished - Jun 2010
    Event1st International Particle Accelerator Conference - Kyoto International Conference Centre (KICC), Kyoto, Japan
    Duration: 23 May 201028 May 2010
    Conference number: 1st

    Conference

    Conference1st International Particle Accelerator Conference
    Abbreviated titleIPAC'10
    CountryJapan
    CityKyoto
    Period23/05/1028/05/10

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