Basic study on lithium coating and plasma-surface processes

锂涂层和等离子体表面工艺的基础研究

基本信息

批准号：
05680391
负责人：
TOYODA Hirotaka
金额：
$ 1.28万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05680391/
关键词：
Nuclear fusion Lithium coating Hydrogen recycling oxygen gettering

项目摘要

1. Establishment of Lithium Coating TechniqueLithium coating with evaporation method is investigated. It was found that the evaporation speed can be easily controlled by the oven temperature around 400 C.To suppress impurity from heated oven, RF inductive heating is used, which effectively heat the lithium itself without heating other materials.2. Chemical reaction of lithium with various gasesChemical reactivity of lithium film with various gases such as O_2, H_2, CH_4 or CO was investigated. It is found that the lithium is highly reactive with the oxygen gas, and the coated lithium film is completely oxidized when the oxygen gas is fed into the vessel. CO and CH_4 are also reactive with lithium, but reaction is limited up to a few monolayrs of lithium film surface. Hydrogen does not react with lithium film.3. Interaction of lithium film with hydrogen plasmaInteraction of lithium film with hydrogen DC glow plasma is investigated. Lithium film absorbs large amount of hydrogen. Hydrogen absorption is almost comparable to the coated lithium, which implies that the one lithium atom reacts with one hydrogen atom, and that the hydrogen penetrates into bulk of lithium film irrespective to the ion implantation range of hydrogen ion into the lithium film (less than a few hundred nano-meters).4. Lithium coating of JIPPT-IIU fusion experiment device.Lithium coating is successfully applied to the JIPPT-IIU fusion experiment device at National Institute for Fusion Science. Lithium (0.5g) is evaporated on the vessel wall of JIPPT-IIU,with coating area of about Im^2. It was found that the hydrogen recycling is reduced in the initial stage of tokamak discharge, and that the oxygen and carbon impurities is reduced.

1。研究了使用蒸发方法建立锂涂料技术。发现蒸发速度可以通过烤箱温度轻松控制400 C.为了抑制加热烤箱的杂质，使用了RF感应加热，这可以有效地加热锂本身而无需加热其他材料。2。研究了锂与锂膜的各种气体化学反应性的化学反应与O_2，H_2，CH_4或CO等各种气体的化学反应。发现锂在氧气中高度反应，并且当氧气被送入容器中时，涂层锂膜被完全氧化。 CO和CH_4也用锂有反应性，但反应仅限于锂膜表面的几个单层。氢与锂膜不反应3。研究了锂膜与锂膜的氢浆液与氢DC Glow血浆的相互作用。锂膜吸收大量氢。氢吸收几乎与涂层锂相当，这意味着一个锂原子与一个氢原子反应，并且氢渗透到大部分锂膜中，无论对锂离子的离子植入范围无关几百个纳米米）.4。 Jippt-IIU融合实验设备的锂涂层成功地应用于美国国家融合科学研究所的JIPPT-IIU融合实验设备。锂（0.5G）在Jippt-IIU的血管壁上蒸发，涂层面积约为IM^2。发现在Tokamak排放的初始阶段降低了氢回收，并且氧气和碳杂质减少了。