Tomographic Diagnostics of the Suprathermal X-Ray Radiation on the T-15MD Tokamak

A review of various mechanisms of suprathermal electron generation in tokamak plasma and an analysis of diagnostic systems for the study of the spatial evolution of electron beams are presented. It is planned to use detectors based on CdTe crystals to detect suprathermal x-ray emission (20–300 keV) at the T-15MD tokamak (R = 1.5 m, a = 0.67 m). Spatial resolution is provided by a system of tube collimators placed in detector chambers mounted in vertical, inclined, and equatorial diagnostic ports. To measure suprathermal x-ray emission spectrum, a set of CdTe spectrometric detectors and LaBr3(Ce) scintillation crystal detectors are used. The tomographic program is used to reconstruct spatial localization of the X-ray emission. The received spatial and temporal distribution of local suprathermal electron beams will be used to study a variety of physical phenomena, such as reconnection of magnetic field lines, nonlinear transport processes, distortion of the electron energy distribution function during powerful additional heating and current drive, and plasma perturbances that are important for the study of kinetic instabilities in plasma with fast ions.