Research and development of x-ray imaging crystal spectrometers for KSTAR

The engineering design for two high-resolution x-ray imaging crystal spectrometers for KSTAR tokamak has been completed. A spherically bent quartz crystal and a large area two-dimensional (2D) position-sensitive multiwire proportional counter have been selected for the imaging spectrometers. A prototype 10 cm by 30 cm 2D detector was fabricated and pilot measurement on Alcator C-Mod tokamak was carried out. The final engineering design of the spectrometers and experimental results from the 2D detector are presented.