Plasma and Fusion Research
Volume 14, 2402003 (2019)
Regular Articles
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
- 1)
- Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
- 2)
- Department of Nuclear Engineering, Kyoto University, Kyoto 615-8540, Japan
Abstract
Beach heating using a slow Alfvén wave in ion cyclotron range of frequencies would be the first candidate for ion heating in a DEMO-relevant divertor testing linear plasma device if it is applicable to a high-density regime. To clarify its availability, the density dependence of a slow wave excitation is investigated using a full wave simulation with TASK/WF3D code in the GAMMA 10/PDX central cell configuration, where there is an extensive track record of a beach heating. A shielding effect is successfully demonstrated and well understood under a three-dimensional configuration in the limit of cold plasma approximation. As the density increases, excitable left-handed electric field, which contributes to ion cyclotron heating, degrades more and more from a core region, and resultantly the ion absorption region goes outwards with reducing its power. For core densities above 1020 m−3, the wave field exists only at a very edge, and ion heating becomes negligible unless the wave frequency is much increased with a correspondent magnetic field enhancement.
Keywords
slow wave, wave excitation, shielding effect, full wave calculation, mirror plasma
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