Longitudinal Laser Shaping in Laser Wakefield Accelerators

Details Longitudinal Laser Shaping in Laser Wakefield Accelerators Longitudinal Laser Shaping in Laser Wakefield Accelerators

2000-08-09

arxiv.org/abs/physics/0008026v1

Phys.Lett.A296:125-130,2002

Physics

Accelerator Physics

4 pages, 3 figures, submitted to Physical Review Letters

Scientific paper

10.1016/S0375-9601(02)00248-7

We study the energetics of wake excitation during the laser-plasma interaction in application to laser wakefield accelerators. We find that both the wake amplitude and the accelerating efficiency (transformer ratio) can be maximized by properly shaping the longitudinal profile of the driving laser pulse. The corresponding family of laser pulse shapes is derived in the nonlinear regime of laser-plasma interaction. Such shapes provide theoretical upper limit on the magnitude of the wakefield and efficiency by allowing for uniform photon deceleration inside the laser pulse. We also construct realistic optimal pulse shapes that can be produced in finite-bandwidth laser systems.

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