Narrow H-alpha emission profiles in tokamaks: molecular origin and observational effects
The narrow hydrogen Balmer alpha profiles observed in tokamaks are explained in terms of the slow (approx. 0.3 eV) and fast (2 to 6 eV) excited atoms formed by dissociation of molecular hydrogen at the plasma edge. Extra widening of the spectrum in the wings can be explaind by Zeeman split H-alpha that is reflected from the vacuum vessel. This interpretation is consistent with available high-resolution data. The use of H-alpha as a diagnostic is discussed briefly.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- DOE Contract Number:
- AM02-76CH03073
- OSTI ID:
- 6489612
- Report Number(s):
- PPPL-1758; TRN: 81-009037
- Country of Publication:
- United States
- Language:
- English
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