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Edge Transport Barrier Models for Simulating H-Mode Operation Scenarios in DEMO with Integrated Plasma Transport Code TOTAL

Yoshihiro ITAKURA, Takaaki FUJITA and Atsushi OKAMOTO

Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

(Received 20 March 2021 / Accepted 16 February 2022 / Published 13 May 2022)

Abstract

Edge transport barrier (ETB) models are developed and introduced into an integrated transport code TOTAL. The transitions between L-mode and H-mode are triggered by comparing the net heating power with the threshold powers. At the L to H transition, quick reduction in transport in the pedestal region causes back transition due to reduced net heating power and then gradual change in the transport in the pedestal region is needed. The pedestal pressure is adjusted to the value predicted by an empirical scaling. Three models, the PID control model, the ELM model, and the empirical continuous ELM model, are compared for the pedestal pressure control. The control is possible in all of three models but it is observed that larger pellet injection is needed to increase the density and a lower pedestal density is obtained in the ELM model. During tungsten injection, the pedestal pressure is well controlled in the empirical continuous ELM model and in the PID control model.

Copyright (c) 2022 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

pedestal, H-mode transition, ELM, threshold power, impurity transport

DOI: 10.1585/pfr.17.1403016

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