A diagnostic application of $\gamma$ rays emitted in ${}^6\mathrm{L}\mathrm{i}+\mathrm{D}$ and ${}^6\mathrm{L}\mathrm{i}+\mathrm{T}$ nuclear reactions induced by admixing a small amount of ${}^6\mathrm{Li}$ in DT fusion plasma is investigated. It is shown that the reaction-produced monochromatic γ quanta with energies $E_{\gamma }=0.429,$ 0.478, and 0.981 MeV can be used for ion temperature measurements in DT plasma. The proposed measurements are expected to be essentially independent of the plasma density and its local fluctuations. The required reaction cross sections and the Maxwellian rate parameters of the ${}^6\mathrm{L}\mathrm{i}+\mathrm{T}$ γ-ray production are calculated within a realistic nuclear model.

• Received 7 August 2000

DOI:https://doi.org/10.1103/PhysRevE.63.026413