5 papers
The deteriorating effect of plasma density fluctuations on microwave beam quality
Alf Köhn, Max E. Austin, Michael W. Brookman +13
Turbulent plasma edge density fluctuations can broaden a traversing microwave beam degrading its quality. This can be a problem for scenarios relying on a high spatial localization…
Microwave beam broadening due to turbulent plasma density fluctuations within the limit of the Born approximation and beyond
Alf Köhn, Lorenzo Guidi, Eberhard Holzhauer +4
Plasma turbulence, and edge density fluctuations in particular, can under certain conditions broaden the cross-section of injected microwave beams significantly. This can be a seve…
Perturbing microwave beams by plasma density fluctuations
Alf Köhn, Eberhard Holzhauer, Jarrod Leddy +2
The propagation of microwaves across a turbulent plasma density layer is investigated with full-wave simulations. To properly represent a fusion edge-plasma, drift-wave turbulence…
Kinetic simulations of X-B and O-X-B mode conversion and its deterioration at high input power
A. V. Arefiev, I. Y. Dodin, A. Köhn +4
Spherical tokamak plasmas are typically overdense and thus inaccessible to externally-injected microwaves in the electron cyclotron range. The electrostatic electron Bernstein wave…
Influence of plasma turbulence on microwave propagation
Alf Köhn, Eberhard Holzhauer, Jarrod Leddy +2
It is not fully understood how electromagnetic waves propagate through plasma density fluctuations when the size of the fluctuations is comparable with the wavelength of the incide…