Classical Thermodynamic Analysis of Deuterium-Based Fusion Reactions

The fusion reactions involving deuterium are of great interest for the exploitation energy via magnetic-confinement devices. In classical thermodynamics, spontaneity a process is established through assessment change in Gibbs free energy. So far, feasibility nuclear has been characterized terms cross section and Q-value while entropic term (T ΔS) neglected. Such an assumption always justified fission where ΔS positive. case that operate at very high temperatures (106–107 K) negative, may be positive, making reaction non-spontaneous. This paper proposes thermodynamic analysis D-based applications. entropy contribution was evaluated Sackur–Tetrode equation enthalpy considered constant as corresponding to reaction. results compared with criteria based on reactivity. DT D3He show degree although second one presents lower An increase temperature could enhance reactivity cost decreasing its spontaneity. Both branches DD by much than reactions. Furthermore, their maximum section, exhibit largely positive and, therefore, not spontaneous. At machines (1.5 × 108 K), among studied, exhibits highest degrees