Effect of betatron resonance on plasma wave acceleration of electrons in an ion channelNaveen Kumar and V. K. Tripathi
Department of Physics, Indian Institute of Technology - New Delhi-110016, India
received 30 January 2006; accepted in final form 30 May 2006
published online 23 June 2006
We study the electron acceleration by a plasma wave in an ion channel. Initially, the channel forms due to the action of radial ponderomotive force of short pulse laser and later on sustained by the plasma wave, which is generated by the axial ponderomotive force of the laser pulse. The plasma wave traps and accelerates electrons in this ion channel. The electrons in the channel undergo betatron oscillations and are also accelerated by the plasma wave simultaneously. The acceleration is caused via Cerenkov resonance as well as via betatron resonance. Initially slowly moving electrons gain energy in a stepwise manner with the period of a betatron oscillation.
52.38.Kd - Laser-plasma acceleration of electrons and ions.
52.38.-r - Laser-plasma interactions.
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