Study of Laser Wakefield Acceleration by using Particle-in-cell Simulation

نویسندگان

  • K. Gopal
  • Anjani Kumar Singh
چکیده

Optimization and control of electron beams is a major issue in laser wakefield accelerators. Based on two-dimensional particle-in-cell simulations, we propose a way to control the beam quality in laser wakefield acceleration using proper optimization of laser pulse length. The laser pulse with varying pulse duration has been considered that fulfils the resonance condition ) c ( p L    of plasma wave excitation. Pulse amplitude increases as the front part of the pulse gets compressed that leads to increment in laser pulse intensity and hence, the pulse imparts stronger ponderomotive force on the ambient plasma electrons. Stronger ponderomotive force might affect the injection of electrons into Wakefield. Therefore, one may an employthe laser pulse with varying values of pule length for laser wakefield acceleration to explore the quality of the injected bunch in terms of injected charge, mean energy and emittance. Injection of the electrons beyond a certain limit destroys the plasma wake and hence, energy gain of the injected bunch reduces. Our study based on particle-in-cell simulations reports that the optimization of pulse length is good in terms of monoenergetic beam; low emittance and improved injection for the pulse duration of 30 femtosecond in laser wakefield acceleration.

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تاریخ انتشار 2017