ECRH heating experiments at ω=2ω/sup ce in the end plugs of the Phaedrus tandem mirror

Increases in plasma energy of up to 300 eV per electron-ion pair have been measured using diamagnetic loops. Thomson scattering has measured an increase in the bulk electron temperature of 30% during the microwave pulse. Measurements with a 3 channel target SXR detector have detected the presence of a hot electron tail with energies in excess of 10 keV. Microwave emission from hot electrons is detected by an 8 Ghz radiometer up to 50 ms after the cessation of the microwave power pulse and the plasma discharge. Radial SXR profiles have shown that the bulk of the electron heating occurs outside of the right hand (R) plasma cutoff, which occurs at a density of 1.5 x 10/12 /sup cm/-3 /sup in the Phaedrus plug. Measurements with a miniature RF probe have confirmed that the penetration of the 15.5 Ghz waves is limited by the R cutoff