Efficient electron acceleration by radially polarized Hermite-Cosh-Gaussian laser beam in an ion channel

Abstract

Radially polarized (RP) Hermite-Cosh-Gaussian (HChG) laser beam has been employed to study electron acceleration in an ion channel. As RP-HChG laser beam focus earlier, depending on this property electron acquires high order energy over short periods of time. The ion channel generates an electric field that prevents electrons from escaping from the interaction zone and maintains betatron resonance. Electron’s energy gain has been analyzed by varying different parameters like: intensity parameter (${\text{a}}_{0}$), laser spot size (${\text{r}}_{0}$), decentered parameter (${\text{b}}$), ion density (${\text{n}}_{{\text{i}}}$). The combined effect of RP-HChG laser beam and ion channel causes an efficient energy enhancement of electron in the order of GeV. RP-HChG beam is a unique kind of laser beam, combining the characteristics of both Hermite Gaussian and hyperbolic cosine Gaussian modes. It can be tightly focused to produce a small spot with a high-intensity region at the focal point.

Graphical Abstract

The schematic depicts the electron acceleration by Radially Polarised Hermite Cosh Gaussian laser beam in a Plasma Ion Channel. Due to the early focusing effect of the HChG laser beam, it is remarkably better suitable than other laser beams for gaining GeV order energy over short time period. The coordination between better trapping laser light (RP) and electrostatic field of ion density channel encloses the electron to traverse a considerable distance and attains higher energy along longitudinal direction. It is clearly noticed that HChG laser beam is very much sensitive in ion channel.