Novel First-Wall Conditioning in Stationary Reactor Studies

近年来，利用超导磁体对固定矢量的研究变得越来越重要。在这种情况下，传统的无磁场直流辉光等离子体是无用的，而必须使用磁化等离子体，如ECR微波等离子体。此外，锂颗粒注入等技术将有望在不中断聚变等离子体的情况下进行原位壁调节。研究主要集中在锂包覆和ecr基渗硼方面，主要有：(1)硼包覆提出了两种固定反应器新型渗硼方法。一种是注入十硼烷颗粒，另一种是基于ECR微波放电的磁场下硼化。ECR渗硼的基本实验表明，中性自由基沉积在气体入口附近，离子自由基沉积沿磁力线传输，从而使大容器涂层成为可能。(3)锂包覆层首次发现，锂包覆层对O_2、H_2O、CO、CH_4等多种分子具有较强的捕集作用，同时每一个锂原子吸收一个氢原子。此外，还研究了氢解吸的温度依赖性和锂层中氢态。未来，锂颗粒注入可能是一种强大的工具，可以在不中断聚变等离子体的情况下调节壁。

Studies on stationary rectors with use of superconducting magnets have recently become more important. In this situation, conventional dc glow plasmas under no magnetic field is useless and, instead of them, magnetized plasmas such as ECR microwave plasmas have to be used. Furthemore, such techniques as lithium pellet injection will be promising for in situ wall conditioning without interrupting fusion plasmas. Most of this study was devoted to lithium coating and ECR-based boronization as follows :(1) Boron coatingTwo methods for new boronization in stationary reactors were proposed. One is injection of decaborane pellet injection and the other is boronization based on ECR microwave discharge under magnetic field. The basic experiment of ECR boronization showed a neutral radical deposition localized near the gas inlet and wider deposition of ionic radicals transported along magnetic lines of force, thus making a large vessel coating possible.(3) Lithium coatingIt was found for the first time that a lithium layr has a storong gettering effect on various molecules such as O_2, H_2O,CO and CH_4 while it absorbs a hydrogen atom per a lithium atom. Moreover, studies on the temperature dependence of hydrogen desorption and on hydrogen state in lithium layr. In future, lithium pellet injection could be a powerful tool of conditioning walls without interrupting a fusion plasma.