A full wave simulation on the density dependence of a slow wave excitation in the GAMMA 10/PDX central cell with TASK/WF3D

Ryuya Ikezoe, Yushi Kubota, Makoto Ichimura, Mafumi Hirata, Shuhei Sumida, Seowon Jang, Koki Izumi, Atsuto Tanaka, Ryo Sekine, Hiroki Kayano, Yoriko Shima, Junko Kohagura, Masayuki Yoshikawa, Mizuki Sakamoto, Yousuke Nakashima, Atsushi Fukuyama

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1 Citation (Scopus)

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.

Original languageEnglish
Article number2402003
JournalPlasma and Fusion Research
Volume14
Issue numberSpecialissue1
DOIs
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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