These experiments studied the dynamic behaviour of a deuterium plasma in which a component of the ICRH heating was applied in direct response to real-time plasma parameters (such as neutron rate). Since ICRH mainly heats the electrons, and is centrally deposited, this experimental arrangement simulates the plasma self-heating effect from alpha particles. A separately controlled component (of either ICRH or NBI) was used in the role of auxiliary heating, Paux. A similar technique has been used previously in JET to gain some prior indication of the degree of electron heating which could be expected in DT discharges