An overview of charge-exchange spectroscopy as a plasma diagnostic

Abstract

Charge-exchange spectroscopy in fusion plasmas entails the use of optical transitions that follow electron transfer from a neutral atom into an excited state of an impurity ion. In most applications, the sources of neutral particles are high-energy beams employed either for heating or for the specific purpose of active plasma diagnosis. The transitions following charge exchnge are particularly useful for determining the densities of fully stripped low-2 ions and for measuring ion temperdtUKS and plasma rotation, although they have alm been exploited for other purposes. In this rebiew, the atomic physics considerations for interpreting the data, including the influence of the plasma environment, are reviewed, and examples of recent applications to fusion studies are presented.

Atomic-Orbital Close-Coupling Calculations Of Electron Capture From Hydrogen Atoms Into Highly Excited Rydberg States Of Multiply Charged Ions

“…Major motivation arises from thermonuclear fusion research since these kinds of cross sections are needed for a variety of applications, in particular charge exchange recombination spectroscopy (CXRS) [2]. This diagnostic technique relies on the injection of fast neutral hydrogen (deuterium) atoms into the hot region of the plasma (e.g., by using the neutral heating beam).…”

Tangential SX Imaging for Visualization of Fluctuations in Toroidal Plasmas

“…by doping the neutral beams with carbon and use the charge exchange emission (H 0 + C +6 → H + + C +5 * ). The emission cross section of the CVI is even larger for higher energy transitions [16]. We expect to study the core fluctuations by the impurity radiation when the neutral beam is injected [17].…”

Improved CCD Detectors for High Speed, Charge Exchange Spectroscopy Studies on the DIII-D Tokamak

“…Charge exchange spectroscopy [1] allows determination of ion temperature, poloidal and toroidal velocity, ion density and radial electric field E r in high temperature tokamak plasmas. This technique is based on excitation of visible and near UV radiation from hydrogen-like and lithium-like ions via charge exchange with high energy (80 keV) neutral deuterium beams injected into the plasma.…”