Detection and Analysis of Low energy X Ray Emission from the Princeton-Field-Reversed Configuration (PFRC-2).

The PFRC-2 is an RF-formed and heated field-reversed-configuration magnetic confinement experiment. X rays produced in its plasma have been studied with AMPTEK, X-123 FAST SDDs that view the plasma column in four regions, two near the axial midplane. These detectors provide X-ray energy and arrival-time information. Their detectable X-ray energy range is 0.05-30 keV and resolution 30 eV at 150 eV and 125 eV at 5 keV. From the detected x-ray spectrum (XED), the electron energy distribution (EED), average electron energy and electron density are extracted. We present recent measurements of the XED from 59 to 300 eV and the inferred electron temperature in the PFRC device as functions of magnetic field, heating power, gas pressure and aperture scan based on the Pulse Pile up.