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Tapered capillaries applied in laser wakefield acceleration

Wiggins, S. Mark and Abuazoum, Salima and Vieux, Gregory and Welsh, Gregor H. and Issac, Riju C. and Islam, M. Ranaul and Ersfeld, Bernhard and Brunetti, Enrico and Cipiccia, Silvia and Grant, David W. and Jaroszynski, Dino A. (2012) Tapered capillaries applied in laser wakefield acceleration. In: 2012 Abstracts IEEE International Conference on Plasma Science (ICOPS). IEEE. ISBN 978-1-4577-2127-4

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This paper presents realisation of linearly tapered capillary discharge waveguides (CDWs), manufactured using a femtosecond laser micromachining technique. Waveguiding of a low power, 50 fs duration laser pulse is demonstrated and, despite a slight mismatch of the laser focal spot size with respect to the capillary entrance size, efficient guiding of the Gaussian-shaped laser pulse is obtained. Energy transmission of 80% is obtained for optimal delay of the laser pulse arrival time with respect to the discharge current pulse.