Temporally and Spatially Resolved Profile Measurements of Tokamak Plasmas from X-ray Imaging Crystal Spectrometer

The X-ray imaging crystal spectrometer for the KSTAR tokamak will be used to provide temporally and spatially resolved spectra of helium-like argon (or krypton) from a large cross section of the plasma. The spectral data from the spectrometer both within and perpendicular to the horizontal midplane of KSTAR are used for profile measurements of the ion and electron temperatures, the rotation velocity, and the ionization equilibrium. The spectrometer consists of a sphericallybent quartz crystal and large area two-dimensional (2D) position-sensitive multi-wire proportional counter. A proto-type of the imaging crystal spectrometer was fabricated and installed on NSTX tokamak at PPPL, Alcator C-MOD tokamak at MIT and TEXTOR tokamak at IPP in order to verify a proof-of-principle concept of the imaging spectrometer and advanced profile measurements of tokamak plasmas. In addition, performance tests of the 2D detector, further improvement of the detector, and effective data analysis procedures for the spectrometer were carried out simultaneously