Charge exchange spectroscopy by Fabry-Perot spectrometer in W7-AS

Charge exchange spectroscopy using a Fabry-Perot spectrometer has been developed to study the dynamic of ion temperature and radial electric field in plasmas. A charge coupled device detecter with 80x80 pixels was used to gain the spectral resolution of the charge exchange spectroscopy system. This Fabry-Perot charge exchange spectroscopy system has been applied to measure the ion temperature using the charge exchange line of carbon impurity with a time resolution of 5 ms for high density quasisteady discharges in W7-AS. The cold component due to the charge exchange reaction between the carbon impurity and thermal neutrals is subtracted from the change emission with the beam modulation technique