Investigation of hydrogen recycling in long-duration discharges and its modification with a hot wall in the spherical tokamak QUEST-猫眼课题宝

DOI：

10.1088/1741-4326/aa8121

发表时间：

2017-10

期刊：

Nuclear Fusion

影响因子：

3.3

通讯作者：

中科院分区：

物理与天体物理1区

文献类型：

作者：

K. Hanada;N. Yoshida;T. Honda;Z. Wang;A. Kuzmin;I. Takagi;T. Hirata;Y. Oya;M. Miyamoto;H. Zushi;M. Hasegawa;K. Nakamura;A. Fujisawa;H. Idei;Y. Nagashima;O. Watanabe;T. Onchi;K. Kuroda;H. Long;H. Watanabe;K. Tokunaga;A. Higashijima;S. Kawasaki;T. Nagata;Y. Takase;A. Fukuyama;O. Mitarai

在中型球形托卡马克QUEST中，利用热壁，在等离子体面对壁（PFW）温度良好控制在393 K的情况下，通过8.2 GHz、40 kW的微波实现了完全无感等离子体维持超过1小时55分钟，直到最终因密度不可控而终止放电。PFW由大气等离子喷涂钨和不锈钢组成。热壁在减少壁中储存的氢量以及促进氢循环方面起着至关重要的作用。通过监测氢向等离子体产生容器的注入和从其中的抽出，研究了PFW中燃料氢的行为。将一个基于沉积层和基底之间存在氢输运屏障的燃料粒子平衡方程应用于长时间放电。结果发现，该模型能够很容易地预测所观察到的行为，即较高的壁温可能导致壁更快地达到饱和。

Fully non-inductive plasma maintenance was achieved by a microwave of 8.2 GHz and 40 kW for more than 1 h 55 min with a well-controlled plasma-facing wall (PFW) temperature of 393 K, using a hot wall in the middle-sized spherical tokamak QUEST, until the discharge was finally terminated by the uncontrollability of the density. The PFW was composed of atmospheric plasma-sprayed tungsten and stainless steel. The hot wall plays an essential role in reducing the amount of wall-stored hydrogen and facilitates hydrogen recycling. The behaviour of fuel hydrogen in the PFW was investigated by monitoring the injection and evacuation of hydrogen into and from the plasma-producing vessel. A fuel particle balance equation based on the presence of a hydrogen transport barrier between the deposited layer and the substrate was applied to the long-duration discharges. It was found that the model could readily predict the observed behaviour in which a higher wall temperature likely gives rise to faster wall saturation.

Investigation of hydrogen recycling in long-duration discharges and its modification with a hot wall in the spherical tokamak QUEST

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