Absolute concentrations of light impurity ions in tokamak discharges measured with lithium-beam-activated charge-exchange spectroscopy
✍ Scribed by R. P. Schorn; E. Hintz; D. Rusbüldt; F. Aumayr; M. Schneider; E. Unterreiter; H. Winter
- Book ID
- 104738603
- Publisher
- Springer
- Year
- 1991
- Tongue
- English
- Weight
- 1010 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0721-7269
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✦ Synopsis
We demonstrate the application of Li-CXS (fast lithium-beam-activated charge exchange spectroscopy) for measuring spatially and temporally resolved impurity ion concentrations in the TEXTOR tokamak edge plasma. After briefly describing the method of Li-CXS and its capabilities, we present a model for attenuation and atomic state population of an injected Li beam due to collisional interactions with the background plasma particles, taking into account up to eight excited LiI states for considering stepwise excitation-ionization processes.
Measured impurity radiation characteristics resulting from Li-activated CX of C q ÷ (q = 5, 6) in ohmically heated TEXTOR plasmas are evaluated with the above model and lead to the corresponding impurity ion concentrations within the TEXTOR edge region.