Optical diagnostics with radiation trapping effect in low density and low temperature helium plasma
- Title
- Optical diagnostics with radiation trapping effect in low density and low temperature helium plasma
- Author
- 오차환
- Keywords
- LINE INTENSITY RATIO; ELECTRON-TEMPERATURE; SCATTERING; MODEL; DISCHARGE; EDGE
- Issue Date
- 2016-06
- Publisher
- AMER INST PHYSICS
- Citation
- PHYSICS OF PLASMAS, v. 23, NO 6, Page. 635161-635166
- Abstract
- Low density (n(e) ˂ 10(11) cm(-3)) and low temperature (T-e ˂ 10 eV) helium plasma was generated by hot filament discharge. Electron temperature and density of neutral helium plasma were measured by Langmuir probe and were determined by line intensity ratio method using optical emission spectroscopy with population modelings. Simple corona model and collisional-radiative (CR) model without consideration for radiation trapping effect are applied. In addition, CR model taking into account the radiation trapping effect (RTE) is adopted. The change of single line intensity ratio as a function of electron temperature and density were investigated when the RTE is included and excluded. The changes of multi line intensity ratios as a function of electron temperature were scanned for various radiative-excitation rate coefficients from the ground state and the helium gas pressures related with the RTE. Our CR modeling with RTE results in fairly better agreement of the spectroscopic diagnostics for the plasma temperature or density with the Langmuir probe measurements for various helium gas pressures than corona modeling and CR modeling without RTE. Published by AIP Publishing.
- URI
- https://aip.scitation.org/doi/10.1063/1.4954047https://repository.hanyang.ac.kr/handle/20.500.11754/72309
- ISSN
- 1070-664X; 1089-7674
- DOI
- 10.1063/1.4954047
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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