Abstract:

The heat flows out of the tokamak core region are collected on the diverter and external wall. The control of heat exhaust in the SOL and the divertor region is one of the important issues in tokamak physics. The drifts and parallel current in the SOL are the combination of E × B drift, diamagnetic drift, thermal current and Pifirsch – Schlueter current. The parallel current and all drifts are a strong influence of the heat flow. The impact of drifts and parallel current are simulated by using B2SOLPS0.5.2D fluid transport code. The simulation provides the following results:

1.       The heat flow to the colder divertor is larger than to hotter one so we can expect larger effect for the outer divertor (this is result agree with result given by [1]).

2.       Switching on/off all drifts and currents leads to increasing ion heat flow to divertor plates due to additional ion heat flux generated by all drifts and currents.

3.       Switching on/off all drifts and currents leads to divertor plasma more asymmetric due to additional electron and (ion) heat flow to divertor plates.

4.       Switching on/off all drifts and currents leads to the divertor plates receives larger part of electron heat than electron heat flux.

5.       Switching on/off all drifts and currents has a strong influence on density distribution and radial electric field.