Development of Measurement Methods of Electric Fields in Plasma Using Laser Spectroscopy

激光光谱等离子体电场测量方法的发展

基本信息

批准号：
10480103
负责人：
MURAOKA Katsunori
金额：
$ 4.03万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10480103/
关键词：
plasma electric field laser spectroscopy Stark effect two step LIF

项目摘要

There were three major limitations of electric field measurement methods in plasmas, which have prevented their use in practical discharges. These are, (1) species to be applied, (2) measurable lower detection limits of electric fields, and (3) measurable discharge pressures in collision-induced LIF. By the present study carried out in the fiscal years 1998-1999, there have been great progressives in overcoming each of these limitations as follows.1. The biggest achievement of the study is to have demonstrated the ability to deduce electric fields of any species, by comparing theoretically calenlated Stark profiles and experimental ones, in particular about the spectral appearances and their positions of optically forbidden lines under the presence of electric field.2. The main factors which decides the upper and lower limits of measurable electric fields have been discussed, and by choosing highly excited Rydberg levels, it has been shown that electric field measurements down to 1V/mm be possible.3. In order to overcome the pressure limitations, the scheme of two step laser induced fluorescence (TSLIF) was proposed, and its potential has been experimentally demonstrated.In addition, electric fields in sheath of discharge plasmas has been measuring using these established methods and its structure has been quantitatively discussed. Also, possibilities of applying these methods to high temperature plasma have been discussed.

等离子体电场测量方法存在三个主要限制，阻碍了其在实际放电中的使用。这些是：（1）要应用的物质，（2）可测量的电场检测下限，以及（3）碰撞引起的 LIF 中可测量的放电压力。通过目前在 1998-1999 财政年度进行的研究，在克服这些局限性方面取得了巨大进步，如下所示： 1．这项研究的最大成就是通过比较理论计算的斯塔克分布和实验分布，特别是电场存在下的光谱外观及其光学禁线的位置，证明了推断任何物种电场的能力。 2.讨论了决定可测量电场上限和下限的主要因素，并通过选择高激发里德伯能级，表明可以测量低至1V/mm的电场。 3．为了克服压力限制，提出了两步激光诱导荧光（TSLIF）方案，并通过实验证明了其潜力。此外，已经使用这些已建立的方法及其结构测量了放电等离子体鞘内的电场进行了定量讨论。此外，还讨论了将这些方法应用于高温等离子体的可能性。