1994 Fiscal Year Final Research Report Summary
Plasma spectral formation in non equilibrium ionization plasmas
| Project/Area Number |
04808003
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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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 | National Institute for Fusion Science |
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Principal Investigator |
KATO Takako National Institute for Fusion Science, Associate professor, 助教授 (20115546)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIMOTO Takashi Kyoto University, Fac.of Eng, .Professor, 工学部, 教授 (90026203)
MASAI Kuniaki Tokyo Metropolitan University, Associate professor, 理学部, 助教授 (80181626)
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| Project Period (FY) |
1992 – 1994
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| Keywords | non equilibrium ionization / X-ray spectrum / Plasma diagnostics / Atomic processes / Non thermal electrons / Dielectronic recombination |
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| Research Abstract |
1. Density effect and spectra for the C and He atoms and ions in edge plasmas
It is useful to use the intensity ratios of the spectral lines of low ionized ions for edge plasma diagnostics to know the electron temperature and density. We have studied the density effects on the spectral intensity, ionization, recombination and radiation loss rate coefficients of CI,CII,CIII,CIV,OV and HeI.We also have estimated the dielectronic recombination rate coefficients on the excited states of CI from CII.
2. Time dependent X-ray spectra of He-like ions
We have constructed the convoluted spectra of the He-like X-ray spectra for the analysis of the observed spectra from Tokamak plasmas and/or solar flares. The ion temperature, electron temperature and ion abundances can be derived from the spectra. The larger values of the ion temperature than the electron temperature are derived from the X-ray spectra in the initial phase of the solar flares. This indicates the turbulence in the initial phase. The ion abundances derived from the spectra have shown the non equilibrium ionization in the solar flares which indicate the flow in the plasmas.
3. Data compilation and assessment
The compilation and assessment for the excitation cross sections of He atom have been done and the recommended data are fitted by analytical formulae. We have also evaluated the data of N atom and N-like ions under the international collaboration program. The atomic data for the analysis for BCS spectra obtained by Yohkoh satellite have been recommended.
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