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Measures the argon density from charge-exchange spectroscopy. Determination of the profiles of fully stripped low-Z ions in fusion plasmas; Prediction of the wavelengths of transitions; Detection of transitions in DIII-D tokamak subsequent to argon puffing into neutral-beam injected plasmas.

Investigates the physical processes which limit density in high confinement mode (H-mode) discharges by conducting a series of experiments on the DIII-D tokamak. Divertor pumping to reduce divertor neutral pressure and prevent the formation of a high density, intense radiation zone; Magnetohydrodynamic activity in pellet-fueled plasmas.

Determines profiles of the noninductive current for the DIII-D tokamak discharges, driven by direct electron absorption of fast waves in the ion cyclotron range of frequencies. Presence of centrally peaked driven current; Conditions to be satisfied to measure the noninductive current due to fast wave current drive.