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A magnetically tapered plasma density for overcoming electron dephasing

Published online by Cambridge University Press:  30 September 2011

C. M. WANG
C. M. WANG*
Affiliation:
School of Mechanical and Automotive Engineering, Hefei University of Technology, Postcode 230009, Hefei, China ([email protected])
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Abstract

One of the main limitations of energy gain in laser wakefield accelerators is the electron dephasing, In order to resolve the dephasing problem, a tapered plasma channel is proposed and tested numerically. The tapered density is created by means of a laser heating, combining an axially increased external magnetic field. The locally strong magnetic field prevents the thermal energy transport crossing the field lines, and leads to a pressure buildup. The pressure gradient expels the plasma radially and tapers the density axially. A tapered plasma with a density contrast of 2.2 within a 6-cm channel is established. Propagating in the tapered plasma channel, the energy of an accelerated electron is expected to be enhanced greatly.

Type
Papers
Information
Journal of Plasma Physics , Volume 78 , Special Issue 4: Progress in Laser Acceleration of Particles , August 2012 , pp. 323 - 326
Copyright
Copyright © Cambridge University Press 2011

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