Use of reaction-produced monochromatic γ-rays for temperature diagnostics of DT plasma and relevant nuclear data

A role of γ-ray modes of ⁶Li+T and ⁶Li+D low-energy nuclear reactions induced by admixing a small amount of ⁶Li in DT fusion plasma is investigated. We show that these processes have an important diagnostic implication and the reaction-produced monochromatic γ quanta can be used for ion temperature probe in the plasma. The temperature measurements are expected to be essentially independent of the plasma density. The ⁶Li(t, d₁)⁷Li*[0.478] and ⁶Li(t, p₁)⁸Li*[0.981] reactions are key in the proposed diagnostics and responsible for its satisfactory sensitivity. The required nuclear data on the ⁶Li+T reactions are calculated. The (t, d₁) cross sections found exceed those accepted elsewhere by ∼3 times at sub-barrier energies. The (t, p₁) low-energy nuclear data are obtained for the first time. (author)