Abstract
We propose the possibility to ignite the D-D reactor from the D-T reactor by increasing the deuterium density and reducing the tritium density. Supposing that the D-T reactor has been already realized and the plasma parameters are in the Trapped Ion Regime, the D-D reactor is possibly ignited by continuously developing the plasma parameters from the D-T reactor. The dynamics of the transition is calculated, and it becomes clear that the additional heating in the initial state is very effective. The characteristics of the D-D reactor are also shown. The loss rate of tritium from the core plasma is one order less than that of the conventional D-T reactor. At last the modified D-T reactor which is aimed to improve the tritium breeding ratio in the Li blanket is introduced.
