Modeling of passive charge exchange emission in The Joint European Torus (abstract)

Passive charge exchange (PCX) between neutral deuterium entering the plasma from the walls and ionized light impurities in a Tokamak Fusion Plasma have been investigated, and a comparison between the synthetic spectra and the experimental data is performed. In the core light impurities are fully stripped and may only be detected by the use of charge exchange recombination spectroscopy. Using a multichord spectrometer viewing various radial points from the edge to the plasma center intersecting the neutral beam injection path, a strong localized signal from active charge exchange (ACX) will be detected during the deexcitation process in the plasma ion. However, it is well known that passive charge exchange emission from neutral deuterium in the plasma blends the signal, and since calculations of particle densities are performed on the ACX, it is therefore of crucial importance to separate the ACX from the PCX. The spectra from the PCX component will carry line of sight integrated information about the plas...