Abstract
Production and excitation of hydrogenic light ions in hot plasmas via charge exchange recombination interactions has become the method of choice for the measurements of plasma ion temperatures and rotation velocities. Several atomic physics and environmental effects can conspire to cause perturbations of the measured line profile, and hence reduced the reliability of these measurements. Unresolved atomic fine structure is sometimes nonnegligible and can cause both an artificial asymmetry and broadening of the line. At high magnetic fields, both Zeeman and motional Stark line broadening can make reliable measurements problematic. At the high thermal energies found in contemporary fusion plasmas, the cross section for charge exchange between a plasma ion and a monoenergetic beam neutral can change appreciably across the ion velocity distribution and hence across the line profile. With the proper beam‐sightline orientation, this can lead to large and measurable changes in the apparent ion temperatures and rotation velocities.
Published Version
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