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ELM Dynamic Simulation for Detached Divertor Plasmas Using One-Dimensional Fluid Code

Yue LI, Satoshi TOGO¹⁾, Tomonori TAKIZUKA²⁾ and Yuichi OGAWA

Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8568, Japan

1)

Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan

2)

Graduate School of Engineering, Osaka University, Suita 565-0871, Japan

(Received 27 December 2017 / Accepted 2 April 2018 / Published 22 May 2018)

Abstract

We investigate the dynamic response of plasma detachment against the Edge Localized Mode (ELM) using a one-dimensional fluid code. It is found that the heat flux to the target plate after an ELM crash in the detachment starts to increase with a delay, contrary to the sudden increase in the attachment. Larger electron heat flux and smaller ion heat flux to the plate are found in the detachment due to the strong equipartition between electron and ion temperatures, while their heat fluxes are similar in the attachment. In addition, we find the reverse flow in the detachment caused by ELM unbalancing the plasma pressure. Finally, we examine the grassy-ELMs, and find the accumulation of the heat flux pulses in the detached divertor.

Copyright (c) 2018 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

ELM, detached plasma, one-dimensional fluid code, dynamic response, reverse flow

DOI: 10.1585/pfr.13.3403054

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