<RESEARCH REPORT>Forbidden Transitions as Ion-Temperature Sensitive Lines

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The effect of heavy particle (proton and deuteron) collisions on the intensity of forbidden lines of highly ionized ion will be described. Except for the excitation of plasma impurity ions by charge-exchange recombination with neutral hydrogen, the effects of inelastic collisions between heavy particles are not generally considered to be significant excitation processes in plasma, because of the low velocity of the impinging particle compared to electrons. However, that heavy particle excitation is not completely lacking is borne out by evidence of large proton-induced excitation rates between closely spaced levels in ground state configuration of highly ionized ion in the plasma heated at a high proton temperature. The intensity ratio of forbidden line to allowed line of Fe XVIII was measured during rf heating on the JIPP TII-U tokamak. The results at low electron density indicated a noticeable effect of proton collisions on the intensity of the forbidden line at the time of heating. In the PLT deuterium discharges, two line ratios : a forbidden line to an allowed line of Fe XXII, a forbidden line to a forbidden line of Fe XIX, have been measured as the ion-temperature-sensitive line ratios during rf heating. Measured relative intensities are compared with those estimated from calculation which include the excitation by deuteron collision between the levels of the ground configuration. The agreement between the observed and calculated ratios will be discussed.
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<RESEARCH REPORT>Forbidden Transitions as Ion-Temperature Sensitive Lines

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