High repetition-rate wakefield electron source generated by few-millijoule, 30 fs laser pulses on a density downramp

He, Z-H and Hou, B. and Nees, J. A. and Easter, J. H. and Faure, J. and Krushelnick, K. and Thomas, A. G. R. (2013) High repetition-rate wakefield electron source generated by few-millijoule, 30 fs laser pulses on a density downramp. New Journal of Physics, 15. ISSN 1367-2630

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Abstract

We report on an experimental demonstration of laser wakefield electron acceleration using a sub-TW power laser by tightly focusing 30 fs laser pulses with an 8 mJ pulse energy on a 100 mu m scale gas target. The experiments are carried out at an unprecedented 0.5 kHz repetition rate, allowing 'real-time' optimization of accelerator parameters. Well-collimated and stable electron beams with quasi-monoenergetic peaks in the 100 keV range are measured. Particle-in-cell simulations show excellent agreement with the experimental results and suggest an acceleration mechanism based on electron trapping on the density downramp, due to the time-varying phase velocity of the plasma waves.

Item Type:
Journal Article
Journal or Publication Title:
New Journal of Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
82703
Deposited By:
Deposited On:
08 Nov 2016 10:56
Refereed?:
Yes
Published?:
Published
Last Modified:
25 Feb 2020 07:36