During high powered, short pulse laser interactions with gas targets, electrons are ionized and interact directly with the laser beam. At very high focused intensities of 1018 W cm-2 and higher, the electrons are accelerated to relativistic velocities during each half cycle of acceleration in the focused electric field of the laser. The outward gradient in field intensity, or ponderomotive...
This research project aims to develop numerical models for key physical processes in ion sources, including electron emission from filaments, RF antenna power coupling to the plasma, and Coulomb collisions driving electron thermalization. These models will be implemented using an explicit Particle-In-Cell (PIC) code to simulate plasma behavior and benchmark the results against experimental...
The flow and acceleration of plasma in a converging-diverging magnetic field has many important applications including nuclear fusion in a magnetic mirror, helicon thrusters for space propulsion and plasma based etching of semiconductors. Electromagnetic effects from an azimuthal magnetic field $B_{\phi}$ and centrifugal effects due to azimuthal plasma rotation $V_{\phi}$ are analyzed for a...
AUTHOR: M. Jimenez, J. Moreno, R. Golingo, M. Bradley, and L. Couedel.
Affiliation: Physics and Engineering Physics Department, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada.
Plasma Immersion Ion Implantation (PIII) is a widely used technique in materials science and semiconductor manufacturing to modify surface properties through ion implantation. This process involves...
The fluctuation-induced dynamo electric field has been measured in the core of high-temperature EAST tokamak plasmas using Faraday-effect polarimetry and electron cyclotron emission (ECE). The magnetic amplitude of the kink mode (m/n = 1/1) saturates at 30–50 Gauss inside the q = 1 resonant surface. Electron temperature fluctuations reach up to 10% near the resonant surface, where the gradient...
A stationary ELM-free H-mode has been observed on EAST by RF dominant heating with low input torque. This ELM-free H-mode regime always features an edge quasi-coherent mode which seems to be responsible for enhanced particle transport losses. The edge Er plays an important role in the mode excitation, and the mode’s appearance and disappearance are correlated with edge Er.
The breakdown, lift-off, and propagation of the initial plasma sheath current (PSC) in Mather-type dense plasma focus (DPF) devices play a critical role in achieving reproducible plasma outflows. These stages influence the initial conditions of the pinch compression phase and affect production of energetic ion beams which can be used for material damage studies. Pre-ionization methods, such as...
