Highly efficient acceleration and collimation of high-density plasma using laser-induced cavity pressure

TL;DR

This paper introduces a novel laser-induced cavity pressure scheme for efficiently accelerating and collimating high-density plasma, achieving significantly higher energetic efficiency than traditional methods.

Contribution

The study proposes and demonstrates a new cavity-based laser acceleration method that enhances plasma collimation and efficiency using a guiding channel and hot plasma expansion.

Findings

Achieved effective guidance and collimation of dense plasma in a 2-mm channel.

Demonstrated an order of magnitude increase in acceleration efficiency.

Validated the scheme with 200J laser pulses and CH targets.

Abstract

A novel efficient scheme of acceleration and collimation of dense plasma is proposed and examined. In the proposed scheme, a target placed in a cavity at the entrance of a guiding channel is irradiated by a laser beam introduced into the cavity through a hole and accelerated along the channel by the pressure created and accumulated in the cavity by the hot plasma expanding from the target and the cavity walls. Using 1.315-um, 0.3-ns laser pulse of energy up to 200J and a thin CH target, it was shown that the forward accelerated dense plasma projectile produced from the target can be effectively guided and collimated in the 2-mm cylindrical guiding channel and the energetic efficiency of acceleration in this scheme is an order of magnitude higher than in the case of conventional ablative acceleration.