1987 Fiscal Year Final Research Report Summary
Plasma diagnostics and atomic processes related to the metastable states in high temperature and high density plasmas
| Project/Area Number |
60460222
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
プラズマ理工学
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| Research Institution | Institutl of Plasma Physics, Nagoya University |
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Principal Investigator |
KATO Takako Institute of Plasma Physics, Nagoya University, プラズマ研究所, 助手 (20115546)
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| Co-Investigator(Kenkyū-buntansha) |
MIZUI Junichi Mitsubishi Heavy Industry, 広島造船所, 課長 (80029313)
MASAI Kuniaki Institute of Plasma Physics, Nagoya University, プラズマ研究所, 助手 (80181626)
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| Project Period (FY) |
1985 – 1987
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| Keywords | Plasma diagnostics / XUV spectroscopy / Spectral intensity ratio / Metastable states / 多チャンネル斜入射分光器 |
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| Research Abstract |
1.Plasma diagnostics using line intensity ratios
We have developed a study to measure the electron temperatupe and density from the intensity ratios of spectral lines emitted in plasma. Our method was applied to the intensity ratios measured from JIPPT-IIU tokamak.
i)Spectral of oxygen ions
The line intensity ration which gave electron temperature dependence were measured for OIV - OVII ions and obtained the time evolution of the electron temperature. It was found that during ICRF heating the temperature decreases in the plsama periphery due to gas puffing although the temperature increases near the center. The line intensity ration for electron density were also measured. it was found that the metastable states are populated substantially through the inner subshell ionization.
ii) FeXXII. line intensity ratios
The electron density was obtained from 114 and 117A line intensitites of FeXXII. This measurement was found to be useful on account of its weak dependence on temperature and of the proximity of these spectral lines.
2. Multichannel grazing incidence spectrometer
A time - resolving multiohannel graging incidence spectrometer was constructed for study of the line intensity ratios mentioned above. A ruled grating which provides flat spectral images over the wavelength from 50 to 400A was used. A micro-channel plate and a 1024 channel linear image senser were assembled as a detector. The measurement of the spectral of He, Ne and N ions from 200 to 400A from TPD-I plasma was performed with this spectrometer. The strong population inversion for all the levels from n = 2 to n = 8 of Hell ions were detected.
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