Controlling fast electron beam divergence via temporal shaping of the laser intensity envelope

Details Controlling fast electron beam divergence via temporal shaping of the laser intensity envelope Controlling fast electron beam divergence via temporal shaping of the laser intensity envelope

2010-12-09

arxiv.org/abs/1012.2029v1

Physics

Plasma Physics

Scientific paper

A new experimental technique is described which uses two relativistically intense laser pulses to control and enhance the properties of the MeV electron beam generated during the interaction of an ultra-high-intensity laser pulse with a solid target. Both thermal and Cu K$_{\alpha}$ x-ray imaging diagnostics show reduced emission size, increased peak emission, increased total emission, and reduced shot-to-shot variability with respect to a single high-contrast pulse. This evidences reduced fast electron divergence, increased fast electron current density and increased energy absorption into the target via fast electrons. The observed characteristics are attributed to magnetic field generation within the target and alterations to the plasma density scale length.

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