KSTAR Charge Exchange Spectroscopy System

The charge exchange spectroscopy (CES) system for the Korea Superconducting Tokamak Advanced Research (KSTAR) device is designed to obtain profiles of the ion temperature and rotation velocity by using modulated neutral beam injection and a background system. The CES diagnostic will measure the ion temperature of carbon and other impurities, in conjunction with the neutral heating beam in KSTAR. The visible light from the plasma will be concentrated via collection optics, assembled, and imaged onto quartz fibers. We show the progress of the KSTAR CES diagnostic including the collection assembly, lens design, and cassette system. The KSTAR CES system utilizes a 1.33-m Czerny-Turner spectrometer with variable wavelength. The detector is a thinned back-illuminated charge-coupled device (CCD) that has high quantum efficiency and high readout speed. The spectrometer and CCD detector that will be used in the KSTAR CES system have been tested. Two CES diagnostics systems for KSTAR are compared.