A Scanning SXR Spectrometer Used in Experiments on ECR Plasma Heating at the L-2M Stellarator

摘要

A diagnostic complex that is based on a scanning soft X-ray spectrometer has been developed at the Prokhorov General Physics Institute. The diagnostic complex is intended to measure the radial profiles of the plasma electron temperature in the L-2M stellarator. The maximum counting rate of the spectrometer is 2.0 x 10(5) pulses/s. It allows measuring of SXR spectra in the energy range of gamma-photons of 1-80 keV. Thespectral resolution of the spectrometer measured using a source of radioactive radiation with energy of E = 5.89 keV (Fe-55) was Delta E = 320 eV (FWHM). The scanning system makes it possible to measure SXR spectra along the chords lying in the angular range from -13.5 degrees to +26.5 degrees. Negative and positive angles correspond to chords below and above the equatorial plane of the facility, respectively. The radial resolution of the spectrometer at the plasma axis is similar to 1.7 cm. The first results of spectral measurements in experiments at electron cyclotron resonance plasma heating at the L-2M stellarator are presented.