Novel First-Wall Conditioning in Stationary Reactor Studies

最近，使用超导磁体的固定式接收器的研究变得更加重要。在这种情况下，传统的直流辉光等离子体在没有磁场的情况下是无用的，必须使用ECR微波等离子体等磁化等离子体来代替它们。此外，锂颗粒注射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。本论文的主要研究内容如下：(1)渗硼：提出了两种在固定反应器中渗硼的新方法。一种是注入十硼烷颗粒，另一种是在磁场作用下基于ECR微波放电的渗硼。ECR渗硼的基础实验表明，在气体入口附近有中性的自由基沉积，离子自由基沿磁力线传输，从而使大容器涂层成为可能。(3)锂涂层首次发现，锂涂层在每个锂原子吸收一个氢原子的同时，对O_2、H_2O、CO和CH_4等各种分子具有持久的吸杂作用。此外，还研究了氢的脱附与温度的关系以及锂层中氢的状态。在未来，锂颗粒注射可能成为一种强大的工具，在不中断聚变等离子体的情况下调节墙壁。

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.