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The nonlinear thermal balance equation for classical plasma in a toroidalgeometry is analytically and numerically investigated including ICRH power. Thedetermination of the equilibrium temperature and the analysis of the stabilityof the solution are performed by solving the energy balance equation thatincludes the transport relations obtained by the classical kinetic theory. Anestimation of the confinement time is also provided. We show that the ICRHheating in the IGNITOR experiment, among other applications, is expected to beused to trigger the thermonuclear instability. Here a scenario is consideredwhere IGNITOR is led to operate in a slightly sub-critical regime by adding asmall fraction of ${}^3He$ to the nominal $50$$\%$-$50$$\%$ Deuterium-Tritiummixture. The difference between power lost and alpha heating is compensated byadditional ICRH heating, which should be able to increase the global plasmatemperature via collisions between ${}^3He$ minority and the background $D-T$ions.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Analysis of the Thermonuclear Instability including Low-Power ICRH Minority Heating in IGNITOR