Dynamic Edge-Control and Transport in High-Temperature Plasma

(1)对边缘等离子体控制进行了一些实验研究。它们是RF限制器实验、高Z限制器实验、弹丸注入实验和惰性气体注入实验，其中已经获得了一些实验结果。两名德国科学家访问了名古屋大学，并对射频限制器进行了初步实验。在此基础上，设计并制造了德国TEXTOR托卡马克的新型限幅器。(2)一个由钨和碳制成的双限制器已经在TEXTOR托卡马克上使用。incerted.to已发现碳已沉积在钨表面上。另一方面，钨在碳上的沉积量很小，这表明钨侧的侵蚀速率较小，如预期的那样。研究结果将由Ohgo博士在第13届PSI会议上以口头论文的形式提出。(3)研究了颗粒注入后电流分布的变化。研究发现，当弹丸侵彻深度足够深时， ...更多信息 轴上的y小于周边上的y。研究了脉动振荡与剖面变化的关系。(4)在TEXTOR托卡马克装置上安装了栅网离子敏感探针，并开始了相关实验。证实了离子温度高于电子温度，这与热中子的测量结果一致。(5)高Z材料的研究一直在进行中。小块的钨涂层碳已经用电子束设备进行了测试。涂层的厚度为0.5和1.0mm。它们的相关系数高达25 MW/m^2。用与这些小块相同的方法制作了10个限位块。它们将于今年夏天安装在TEXTOR托卡马克上。(6)最终确定了动态各态历经转向器（DED）的研制。线圈和碳瓦将在1999年底前安装。根据这次合作的结果，确定了三个硬件改造方案。这些是DED、（5）的钨限制器和（1）的RF限制器。这项合作探索了TEXTOR托卡马克上新的更大规模的项目。少

(1) A few experiments have been carried out for the edge-plasma control. They are RF-limiter experiments, high Z limiter experiments, pellet injection experiments, and noble gas injection experiments, in which several experimtal results have been obtained. Two Germen scientists visited Nagoya university and did a preliminary experiments on the RF-limiter. Based on the results, a new limiter has been designed and fablicated for TEXTOR tokamak in Germeny.(2) A twin-limiter made of tungsten and carbon has been incerted.to TEXTOR tokamak. It has been found that carbon has deposited on the tungsten surface. On the other hand, tungsten deposition on carbon was small, which indicates smaller erosion rate at the tungstenside as expected. The results will be presented by Dr. Ohgo in the l3th PSI Conference as an oral paper.(3) Change in current profile has been invvestigated just after the pellet injection. It has been found that, when the pellet-penetration depth is deep enough, current densit … More y on the axis is smaller than that in the periphery. Relation has been investigated between sawtooth oscillation and the profile-change.(4) An ion sensitive probe with grids has been installed in TEXTOR tokamak, and experiments have been started. It was confirmed that ion temperature was higher than electron temperature, Which was consistent with a measured results of heat nlow.(5) Investigation of high Z materials have been in progress. Small pieces of tungsten-coated carbon have been tested with an electron beam facility. The thickness of the coated layr was o.5 and 1.0mm. They are torelated up to 25 MW/m^2. Ten limiter blocks were fabricated with the same way as these small pieces. They will be installed in TEXTOR tokamak in this summer.(6) Fabricadon of Dynamic Ergodic Divertor (DED) was finally approved. Coils and carbon tiles will be installed before the end of l999.Three program of hardware modification have been decided based on the results oftained in this collaboration. Tney are DED,the tungsten limiter of (5), and RF-limiter of (1). This collaboration has explored new larger scale programs on TEXTOR tokamak. Less