X-Ray Observations and Electron Temperature Measurement by Soft X-Ray Spectroscopy on the CTH Experiment

Hard x-ray (HXR) emission of runaway electrons with energies up to a few MeV are observed in the Compact Toroidal Hybrid (CTH) torsatron experiment ($R = 0.75m$, $a \sim 0.2m$, $B \leq 0.7~T$, $n_e \leq 10^{19}~m^{-3}$, $I_p \leq 65~kA$). HXRs were measured using a scintillator approximately $4m$ from the CTH device oriented tangentially to the plasma current. A sudden absence of HXRs before and during abruptions in the plasma current was observed. Electron temperature measurements are derived from soft x-ray measurements using an Amptek spectrometer. The soft x-ray spectrometer views the Bremsstrahlung emission along a single chord through the plasma in the energy range from $0.7 - 4 keV$. Central temperature measurements will be presented.