11 May 2011 High resolution, single shot emittance measurement of relativistic electrons from laser-driven accelerator
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Abstract
The normalised transverse emittance is a measure of the quality of an electron beam from a particle accelerator. The brightness, parallelism and focusability are all functions of the emittance. Here we present a high-resolution single shot method of measuring the transverse emittance of a 125 ± 3 MeV electron beam generated from a laser wakefield accelerator (LWFA) using a pepper-pot mask. An average normalised emittance of εrms,x,y = 2.2 ± 0.7, 2.3 ± 0.6 π-mmmrad was measured, which is comparable to that of a conventional linear accelerator. The best measured emittance was εrms,x,=1.1 ± 0.1 π-mm-mrad, corresponding to the resolution limit of our system. The low emittance indicates that this accelerator is suitable for driving a compact free electron laser.
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G. G. Manahan, G. G. Manahan, E. Brunetti, E. Brunetti, R. P. Shanks, R. P. Shanks, M. R. Islam, M. R. Islam, B. Ersfeld, B. Ersfeld, M. P. Anania, M. P. Anania, S. Cipiccia, S. Cipiccia, R. C. Issac, R. C. Issac, G. Raj, G. Raj, G. Vieux, G. Vieux, G. H. Welsh, G. H. Welsh, S. M. Wiggins, S. M. Wiggins, D. A. Jaroszynski, D. A. Jaroszynski, } "High resolution, single shot emittance measurement of relativistic electrons from laser-driven accelerator", Proc. SPIE 8079, Laser Acceleration of Electrons, Protons, and Ions; and Medical Applications of Laser-Generated Secondary Sources of Radiation and Particles, 807909 (11 May 2011); doi: 10.1117/12.887175; https://doi.org/10.1117/12.887175
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