Tokamak design for reacting plasma experiment at IPP Nagoya

Reacting plasma project (R-Project) aims at studying the reacting plasma physics with relatively small sized tokamak which has a sort discharge time of 1.5 sec. A Q-value of 0.3 is expected when additional heating is applied (NBI > or approximately 15 MW, RF > or approximately 5 MW). In the first phase design of R-tokamak, we adopted stainless steel for structural material. The induced radioactivity of such device caused by one D-T shot is estimated to be several mrem/hr at the machine surface even after a few months. Remote handling technique is, therefore, inevitable in order to perform reasonable number of D-T shots. Alternatively, the use of aluminum alloy for structural material is examined to reduce the induced radioactivity and to ease remote handling technique. (author)