Bochum 2015 – scientific programme
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P: Fachverband Plasmaphysik
P 2: Magnetic Confinement I
P 2.5: Talk
Monday, March 2, 2015, 11:55–12:10, HZO 30
Perturbations of a microwave beam by plasma density fluctuations — Alf Köhn1, Eberhard Holzhauer1, Mirko Ramisch1, Matthew Thomas2, Roddy Vann2, and •Jarrod Leddy2 — 1Institut für Grenzflächenverfahrenstechnik und Plasmatechnologie, Universität Stuttgart — 2York Plasma Institute, Department of Physics, York, U.K.
Microwave heating is a widespread tool in both high- and low-temperature plasmas. While high-temperature fusion plasmas are usually below cut-off density, allowing the microwave to propagate to the centre, this is different in low-temperature plasmas: the electromagnetic wave needs to couple to electrostatic waves at the plasma boundary if central heating is considered. The microwave beam is in either case interacting with the plasma boundary, by traversing it or by triggering mode conversion processes there. Due to the strong gradients of the density at the plasma boundary, the turbulence is largest there. In this work, we investigate the perturbation of a microwave beam by these density fluctuations. The fluctuations are created by a Hasegawa-Wakatani drift-wave turbulence model within the BOUT++ framework. The microwave simulations are performed with the full-wave code IPF-FDMC.