83 research outputs found
The Suppression of Radiation Reaction and Laser Field Depletion in Laser-Electron beam interaction
The effects of radiation reaction (RR) have been studied extensively by using
the ultraintense laser interacts with the counter-propagating relativistic
electron. At the laser intensity at the order of W/cm, the
effects of RR are significant in a few laser period for a relativistic
electron. However, the laser at such intensity is tightly focused and the laser
energy is usually assumed to be fixed. Then, the signal of RR and energy
conservation cannot be guaranteed. To assess the effects of RR in a tightly
focused laser pulse and the evolution of the laser energy, we simulate this
interaction with a beam of electrons by means of Particle-in-Cell (PIC)
method. We observed that the effects of RR are suppressed due to the
ponderomotive force and accompanied by a non-negligible amount of laser field
energy reduction. This is due to the ponderomotive force that prevents the
electrons from approaching the center of the laser pulse and leads to the
interaction at weaker field region. At the same time, the laser energy is
absorbed through ponderomotive acceleration. Thus, the kinetic energy of the
electron beam has to be carefully selected such that the effects of RR become
obvious.Comment: 6 pages, 3 figure
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