A5074488769- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Dust and Plasma Wave Phenomena
- Seismic Waves and Analysis
- Ionosphere and magnetosphere dynamics
- Oceanographic and Atmospheric Processes
- Superconducting Materials and Applications
- Geophysics and Sensor Technology
- Fluid Dynamics and Turbulent Flows
- Differential Equations and Numerical Methods
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Computational Fluid Dynamics and Aerodynamics
- Laser-Plasma Interactions and Diagnostics
- Nuclear physics research studies
- Gyrotron and Vacuum Electronics Research
University of York
2015-2018
Culham Centre for Fusion Energy
2017-2018
Stellenbosch University
2014
Abstract ST40 is a compact, high-field ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi>B</mml:mi> <mml:mi mathvariant="normal">T</mml:mi> <mml:mn>0</mml:mn> </mml:mrow> </mml:msub> <mml:mtext>⩽</mml:mtext> <mml:mn>2.1</mml:mn> <mml:mstyle scriptlevel="0"/> <mml:mtext>T</mml:mtext> </mml:math> ) spherical tokamak (ST) with mission to expand the physics and technology basis for ST route commercial fusion. The research programme covers...
We investigate the cluster emission of Ne isotopes from nuclei and . Experiments are unable to distinguish between , but by establishing a method determining cluster, with associated preformation probability, using binary formalism, we deduce that most likely emitted is
Spherical tokamak plasmas are typically overdense and thus inaccessible to externally-injected microwaves in the electron cyclotron range. The electrostatic Bernstein wave (EBW), however, provides a method access plasma core for heating diagnostic purposes. Understanding details of coupling process electromagnetic waves is important both interpretation microwave data assessing feasibility EBW current drive. While reasonably well-understood linear regime, nonlinear physics arising from high...
We have performed fully-kinetic simulations of X-B and O-X-B mode conversion in one two dimensional setups using the PIC code EPOCH. recovered linear dispersion relation for electron Bernstein waves by employing relatively low amplitude incoming waves. The presented here can be used to study non-linear regimes conversion.
A kinetic model for studying the time evolution of distribution function microwave start-up is presented. The two dimensional in momentum space, but, simplicity and rapid calculations, has no spatial dependence. Experiments on Mega Amp Spherical Tokamak have shown that plasma current carried mainly by electrons with energies greater than $70$ keV, effects thought to be important these experiments are included, i.e. particle sources, orbital losses, loop voltage heating, suitable volume...
Abstract A mutli-frequency electron cyclotron resonance heating and current drive system is currently under construction at the ST40 spherical tokamak. The employs two gyrotrons with a maximum output power of 1 MW each. Both can be tuned to operate either 105 GHz or 140 GHz. designed study non-inductive plasma start-up, ramp-up sustainment. Detailed modelling capabilities has been conducted for various RF launch configurations in ST40.
Tokamak plasma current start-up assisted by Electron Bernstein waves (EBW) has been demonstrated successfully in a number of experiments. The dynamic phase involves change field topology, as the initially open magnetic lines form closed flux surfaces (CFS) under initiation current. This topology will bring about drive (CD) mechanism, and, although various mechanisms have proposed to explain formation CFS, no detailed theoretical studies previously undertaken. Here, we report on development...