Observation of Ti XXI line radiation in ECH plasmas

Helium-like titanium line radiation in the x-ray region from 2.60 to 2.64 A has been measured with a high resolution spectrograph (lambda/..delta..lambda > 19,000) during electron cyclotron heating (ECH) experiments on the Doublet III tokamak. The intensity of the resonance line (i.e., 1s/sup 2/ /sup 1/S/sub 0/ - 1s2p /sup 1/P/sub 1/) is found to be much more sensitive to the applied ECH power than the intensities of the satellite lines. A qualitative picture which accounts for the observed line intensities is the presence of non-Maxwellian electrons in the ECH plasma.