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Effect of an axial magnetic field and ion space charge on laser beat wave acceleration and surfatron acceleration of electrons

Published online by Cambridge University Press:  24 June 2009

R. Prasad ,
R. Singh  and
V.K. Tripathi
R. Prasad
Affiliation:
Physics Department, Indian Institute of Technology Delhi, New Delhi, India
R. Singh*
Affiliation:
Center for Energy Studies, Indian Institute of Technology Delhi, New Delhi, India
V.K. Tripathi
Affiliation:
Physics Department, Indian Institute of Technology Delhi, New Delhi, India
*
Address correspondence and reprint requests to: Rohtash Singh, Center for Energy Studies, Indian Institute of Technology Delhi, New Delhi-110016, India. E-mail: [email protected]
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Abstract

The presence of an axial magnetic field in a laser beat wave accelerator enhances the oscillatory velocity of electrons due to cyclotron resonance effect leading to higher amplitude of the ponderomotive force driven plasma wave, and higher energy of accelerating electrons. The axial magnetic field inhibits the transverse escape of electrons and thus causes a growth of the interaction length. The surfatron acceleration of electrons also shows a similar enhancement. A surfatron transverse magnetic field deflects the electrons parallel to the phase fronts of the accelerating wave keeping them in phase with it. However, the electron continues to move away radially.

Keywords

Axial magnetic fieldBeat waveLaserPlasma wavePonderomotive forceSurfatron
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 3 , September 2009 , pp. 459 - 464
Copyright
Copyright © Cambridge University Press 2009

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