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Pepper-pot emittance measurement of laser-plasma wakefield accelerated electrons

Shanks, R. P. and Anania, M. P. and Brunetti, E. and Cipiccia, S. and Ersfeld, B. and Gallacher, J. G. and Issac, R. C. and Islam, M. R. and Vieux, G. and Welsh, G. H. and Wiggins, S. M. and Jaroszynski, D. A. (2009) Pepper-pot emittance measurement of laser-plasma wakefield accelerated electrons. In: Conference on Harnessing Relativistic Plasma Waves as Novel Radiation Sources From Terahertz to X-Rays and Beyond, 2009-04-21 - 2009-04-23.

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Abstract

The transverse emittance is an important parameter governing the brightness of an electron beam. Here we present the first pepper-pot measurement of the transverse emittance for a mono-energetic electron beam from a laser-plasma wakefield accelerator, carried out on the Advanced Laser-Plasma High Energy Accelerators towards X-Rays (ALPHA-X) beam line. Mono-energetic electrons are passed through an array of 52 mu m diameter holes in a tungsten mask. The pepper-pot results set an upper limit for the normalised emittance at 5.5 +/- 1 pi mm mrad for an 82 MeV beam.