The deteriorating effect of plasma density fluctuations on microwave beam quality

Autor: H. Weber, Omar Maj, Antti Snicker, Eberhard Holzhauer, C.C. Petty, Alf Köhn, Kenneth W Gentle, Michael Brookman, Emanuele Poli, Max E Austin, L. Guidi, Rob J. La Haye, Matthew B. Thomas, Jarrod Leddy, Roddy G. L. Vann

Publikováno v: EPJ Web of Conferences
EPJ Web of Conferences, Vol 203, p 01005 (2019)

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 of the deposition of injected microwave power, like controlling MHD i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c91b26ec4d3235ad3bdfd3b1bc1d7a21
https://hdl.handle.net/21.11116/0000-0003-4119-821.11116/0000-0003-4117-A

Kinetic simulations of X-B and O-X-B mode conversion and its deterioration at high input power

Autor: Alexey Arefiev, Alf Köhn, Roddy G. L. Vann, Vladimir Shevchenko, E. J. Du Toit, Eberhard Holzhauer, Ilya Dodin

Publikováno v: Arefiev, AV; Dodin, IY; Koehn, A; Du Toit, EJ; Holzhauer, E; Shevchenko, VF; et al.(2017). Kinetic simulations of X-B and O-X-B mode conversion and its deterioration at high input power. NUCLEAR FUSION, 57(11). doi: 10.1088/1741-4326/aa7e43. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/6qr8t2z2
Nuclear Fusion, vol 57, iss 11
Nuclear Fusion
NUCLEAR FUSION, vol 57, iss 11

Spherical tokamak plasmas are typically overdense and thus inaccessible to externally-injected microwaves in the electron cyclotron range. The electrostatic electron Bernstein wave (EBW), however, provides a method to access the plasma core for heati

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a0927a4747563e2e048179b2f75fb54
http://www.escholarship.org/uc/item/6qr8t2z2

Influence of plasma turbulence on microwave propagation

Autor: Roddy G. L. Vann, Matthew Bryn Thomas, Eberhard Holzhauer, Jarrod Leddy, Alf Köhn

Publikováno v: Plasma Physics and Controlled Fusion

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 incident radiation. In this paper, the perturbing effect of a turbulent plas

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eb3d7a7fce666c15107ec775502ff808
https://eprints.whiterose.ac.uk/104571/1/final_version.pdf

Kinetic simulations of X-B and O-X-B mode conversion

Autor: Alexey Arefiev, E. J. Du Toit, Vladimir Shevchenko, Eberhard Holzhauer, Alf Köhn, Roddy G. L. Vann

Publikováno v: AIP Conference Proceedings

We have performed fully-kinetic simulations of X-B and O-X-B mode conversion in one and two dimensional setups using the PIC code EPOCH. We have recovered the linear dispersion relation for electron Bernstein waves by employing relatively low amplitu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::570b4ed6fc6e0f512759c9e8ac57f969
https://doi.org/10.1063/1.4936540

Doppler reflectometry with optimized temporal resolution for the measurement of turbulence and its propagation velocity

Autor: Eberhard Holzhauer, M. Hirsch

Publikováno v: Plasma Physics and Controlled Fusion. 46:593-609

Doppler reflectometry selects electron density perturbations with a finite wave vector K⊥ by a line of sight which is non-perpendicular with respect to the reflecting layer. This provides, simultaneously, a local measurement of their propagation ve

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ff2bbd0d60312d532dfc1af253bf794f
https://doi.org/10.1088/0741-3335/46/4/002