Use of Reaction-Produced Monochromatic 7-Rays for Temperature Diagnostics of DT Plasma and Relevant Nuclear Data

Abstract

A role of U+03D2-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 U+03D2 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.

Keywords:

• low-energy nuclear reaction
• reaction cross section
• reaction rate parameter
• U+03D2 rays
• lithium 6
• deuterium-tritium plasma
• ion temperature
• plasma diagnostics