Novel First-Wall Conditioning in Stationary Reactor Studies

利用超导磁体的静止电抗器的研究近年来变得越来越重要。在这种情况下，传统的直流辉光等离子体下没有磁场是无用的，而不是他们，磁化等离子体，如ECR微波等离子体必须使用。此外，锂丸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。本论文主要研究了锂包覆和ECR基硼化反应，具体内容如下：（1）硼包覆提出了两种在固定反应器中进行硼化反应的新方法。一种是十硼烷颗粒注入法，另一种是基于磁场下ECR微波放电的硼化法。ECR硼化的基础实验表明，中性自由基沉积定位在气体入口附近和更广泛的沉积离子自由基传输沿着磁力线，从而使一个大的容器涂层可能。(3)首次发现锂层对O_2、H_2O、CO和CH_4等多种分子都有较强的吸杂作用，同时每一个锂原子吸一个氢原子。此外，还研究了氢的脱附温度和锂层中氢的状态。在未来，锂颗粒注入可能是一个强大的工具，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.