Enhancement of Electron Temperature under Dense Homogenous Plasma by Pulsed Laser Beam

Khalid A Yahya

doi:10.21123/bsj.2021.18.4.1344

Abstract

The applications of hot plasma are many and numerous applications require high values of the temperature of the electrons within the plasma region. Improving electron temperature values is one of the important processes for using this specification in plasma for being adopted in several modern applications such as nuclear fusion, plating operations and in industrial applications. In this work, theoretical computations were performed to enhance electron temperature under dense homogeneous plasma. The effect of power and duration time of pulsed Nd:YAG laser was studied on the heating of plasmas by inverse bremsstrahlung for several values for the electron density ratio. There results for these calculations showed that the effect of increasing the values of the laser pulse power (25-250kW) led to decrease the absorption coefficient values by 58.3% and increase the electron temperature by 50.0% at duration pulse time 0.5ns and electron density ratio 0.1. Furthermore, the ratio of electron density increasing and pulse duration time led to increase the higher values of the electron temperature. The results of the calculations showed the effect of the laser power, the percentage of electron density, and the pulse duration for improving the electron temperature. It is possible to control the temperature of the electrons with one of the plasma parameters or the laser beam used, and that it gives a clear indication of researchers in this field to choose the optimal wavelength of the laser beam and electron density ratios for the plasma.

Highlights

Electron temperature is the primary measurement of the kinetic energy of electrons inside plasma
The researchers focused on this parameter in order to change the values of electron temperature according to the requirements of practical applications such as including nuclear fusion, plating operations and in industrial applications[1,2,3].There are several methods for heating plasma and varying the electron temperature values such as, applying a magnetic field or interacting by a laser beam with plasma [4,5,6,7].The process of energy absorbing of the laser beam occurs by inverse bremsstrahlung (IB)
The computations were done with the aid of equations 1 to 8 to study the effective parameters for heating a plasma region by a pulsed laser beam as the following: Laser pulse profiles The research adopted the Gaussian profile of the Nd:YAG laser pulse with a wavelength 1.06 μm,which interacted with the plasma region

Summary

Introduction

Electron temperature is the primary measurement of the kinetic energy of electrons inside plasma. The research includes the study of the parameters affecting the heated homogenous plasma using inverse bremsstrahlung absorption (IB) interaction pulsed laser beam with plasma.

Results

Conclusion