Premium
Emission Spectroscopy of Hydrogen Molecules in Technical and Divertor Plasmas
Author(s) -
Fantz U.
Publication year - 2002
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/1521-3986(200211)42:6/7<675::aid-ctpp675>3.0.co;2-6
Subject(s) - divertor , asdex upgrade , plasma , atomic physics , tokamak , hydrogen , deuterium , spectral line , hydrogen molecule , plasma diagnostics , physics , materials science , nuclear physics , quantum mechanics , astronomy
The paper gives an overview of the diagnostics of hydrogen molecules in technical plasmas (MW and RF discharges) and in divertor plasmas of fusion experiments (ASDEX Upgrade (Tokamak at the Max‐Planck‐Institut für Plasmaphysik in Garching near Munich, Germany). The Fulcher transition in the visible spectral range was chosen for analysis since this is the most prominent band in the spectrum of molecular hydrogen. Examples for diagnostics of molecular densities will be given, and the problems arising in the interpretation of spectra will be discussed. In divertor plasmas the diagnostics of molecular .uxes will be introduced and the contribution of molecules to the plasma recombination will be discussed. Results for vibrational populations in the ground state and the correlation to the upper Fulcher state will be given, providing an electron temperature diagnostic. Finally, the in.uence of surfaces (high‐grade steel and graphite) on vibrational populations and on re.ection coe.cients of atoms will be shown. Special attention is given on a comparison of the isotopes hydrogen and deuterium.