High-resolution spectroscopy of a hot tokamak plasma seeded with argon ions and interacting with an energetic, short-pulse neutral hydrogen beam was used to obtain a high-resolution K -shell x-ray spectrum formed solely by charge exchange. The observed K -shell emission of Ar16+ is dominated by the intercombination and forbidden lines, providing clear signatures of charge exchange. Results from an ab initio atomic cascade model provide excellent agreement, validating a semiclassical approach for calculating charge-exchange cross sections.
P. Beiersdorfer et al., "Charge-Exchange-Produced K -shell X-Ray Emission from Ar¹⁶⁺ in a Tokamak Plasma with Neutral-Beam Injection," Physical Review A, American Physical Society (APS), Sep 2005.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.72.032725
Lawrence Livermore National Laboratory
United States. Department of Energy
Keywords and Phrases
Charge Exchange; Charge-Exchange Cross Sections; High Resolution Spectroscopy
Article - Journal
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