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|Title: ||Electron beam quality measurements on the ALPHA-X laser-plasma wakefield accelerator|
|Authors: ||Welsh, G. H.|
Anania, M. P.
Burgess, R. T. L.
Islam, M. R.
Issac, R. C.
Manahan, G. G.
Reitsma, A. J. W.
Shanks, R. P.
Wiggins, S. M.
Jaroszynski, D. A.
Gillespie, W. A.
MacLeod, Allan M.
van der Geer, S. B.
de Loos, M. J.
|Affiliation: ||University of Abertay Dundee. School of Computing & Engineering Systems|
|Keywords: ||Electron beam quality|
Laser plasma wakefield accelerator
|Issue Date: ||Jun-2010|
|Publisher: ||Joint Accelerator Conferences Website|
|Type: ||Conference Paper|
|Rights: ||This is the published version (c)IPAC10. Available at Joint Accelerator Conferences Website (JACoW)http://www.jacow.org/|
|Citation: ||Welsh, G.H. et al 2010. Electron beam quality measurements on the ALPHA-X laser-plasma wakefield accelerator. Proceedings of the first International Particle Accelerator Conference (IPAC’10), Kyoto,23-28 May 2010, [Online] Available from http://accelconf.web.cern.ch/AccelConf/IPAC10/papers/mope072.pdf|
|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.|
|Appears in Collections:||Computing & Engineering Systems Collection|
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