Abstract
The particle-in-cell plasma simulation program in two dimensions was developed to display the properties of silver plasma under the effect of Ruby laser 694.3 nm with different intensities; 1012Wcm-2, 1015 Wcm-2, 1018 Wcm-2, and 1020 Wcm-2. The time evolution and the properties of total energy, kinetic energy, and drift energy of the system were examined in the region near the critical density (ne=0.2ncr). The charged particles respond to the laser pulse after a specified period of interaction time in the form of an increase in the energy of the system. This response depends on the intensity of the laser pulse used in this work. A significant increase was observed in plasma energy due to the efficient transfer of laser energy to plasma particles by the Inverse Bremsstrahlung process. The effectiveness of this process is reduced when the laser intensity is increased. This result is shown especially when using 1020 Wcm-2 laser intensity. The results indicated that the plotting of the electron velocity distributions during different time steps of interaction is Maxwellian and it was observed that the curves have a strong energy tail that indicates energy transfers and heating to the plasma.
Highlights
Plasma simulation is an important tool used by physicists and engineers to improve the ability to understanding any complex physical phenomenon and make it simple and explanation is possible, especially after the great development in the software and computer systems in different conditions [1]
The results showed that the process of energy exchange between laser and plasma can be observed as a result of the increase in kinetic energy after 200-time steps from the beginning of the interaction
This means that the electrons during this part of the time period are accelerated to high energy via collisional absorption process which plays an essential role in transferring the laser energy to the plasma
Summary
Plasma simulation is an important tool used by physicists and engineers to improve the ability to understanding any complex physical phenomenon and make it simple and explanation is possible, especially after the great development in the software and computer systems in different conditions [1]. The great advances in computer systems and programming make numerical simulations play a major role in solving many physics problems and studying some important applications. From a physical point of view, the inverse bremsstrahlung process dominates the absorption of plasma particles to the laser energy [17, 18]. The collective behavior of particles is used and the plasma is studied using the equations of continuity and momentum that describe particle density and velocities as a collection In this project, the plasma is treated as an ensemble of computational particle that represents thousands of real particles electrons or ions and it behaves the same as real plasma particles and in it their charge to mass ratio is the same.
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