Small radius start-up of tokamak plasmas with a moving limiter

The problem of start-up for a large size tokamak plasma is studied with a moving limiter. The plasma transport with the presence of the electric field diffusion and heat conduction losses is investigated analytically by the separation of variables during this early phase of the discharge. The results are then applied to a TNS-size plasma. It is shown that a moving limiter may help ameliorate the possible problem of skin effects on the current profile