Abstract
A spectrum line in the Princeton Large Torus (PLT) tokamak discharges, with wave-length measured as 2665.1 \ifmmode\pm\else\textpm\fi{} 0.3 \AA{}, has been identified as the $2{s}^{2}2{p}^{3}^{2}D_{\frac{5}{2}}\ensuremath{\rightarrow}^{2}D_{\frac{3}{2}}$ 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-\AA{} line has been used to measure near-central ion temperature in a discharge with auxiliary neutral-beam heating.
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