A spectrum line in the Princeton Large Torus (PLT) tokamak discharges, with wave-length measured as 2665.1 ±{} 0.3 {}, has been identified as the 2s²2p³²D5/2→²D3/2 magnetic dipole transition in Fe xx ground configuration. A variety of localized spectroscopic diagnostics, e.g., ion temperature and density distribution measurements in the high-temperature interior of the plasma, are feasible by means of forbidden lines of this type. The 2665-{} line has been used to measure near-central ion temperature in a discharge with auxiliary neutral-beam heating.
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Suckewer et al. (1978) studied this question.
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