Ion Acceleration - Target Normal Sheath Acceleration

TL;DR

This paper reviews the physics, mechanisms, and experimental techniques related to target normal sheath acceleration (TNSA), a process producing energetic ion beams using ultra-intense laser interactions with targets.

Contribution

It provides a comprehensive overview of TNSA physics, its dependence on laser and target parameters, and discusses diagnostic and application techniques.

Findings

TNSA produces high-energy, beam-like ion emissions perpendicular to the target surface.

Ion energies and beam properties depend on laser intensity and target composition.

Advances in diagnostics enhance understanding and potential applications of laser-driven ion beams.

Abstract

Energetic ions have been observed since the very first laser-plasma experiments.Their origin was found to be the charge separation of electrons heated by thelaser, which transfers energy to the ions accelerated in the field. The adventof ultra-intense lasers with pulse lengths in the femtosecond regime resulted inthe discovery of very energetic ions with characteristics quite different fromthose driven by long-pulse lasers. Discovered in the late 1990s, these ion beamshave become the focus of intense research worldwide, because of their uniqueproperties and high particle numbers. Based on their non-isotropic, beam-likebehaviour, which is always perpendicular to the emitting surface, theacceleration mechanism is called target normal sheath acceleration (TNSA). Weaddress the physics of the mechanism and its dependence on laser and targetparameters. Techniques to explore and diagnose the beams, to make them usefulfor applications, are also addressed.