Author/Authors :
Harrison، نويسنده , , J. and Lisgo، نويسنده , , S. J. Counsell and R. V. Nithi ، نويسنده , , G.F. and Gibson، نويسنده , , K. and Dowling، نويسنده , , J. and Trojan، نويسنده , , L. G. Reiter، نويسنده , , D.، نويسنده ,
Abstract :
Electrical currents in the scrape-off layer (SOL) of MAST are modelled using an interpretive Onion-Skin Model (OSM) constrained with experimental data from MAST diagnostics. The model was extended to include the effects of the magnetic mirror force, which has a strong influence on the particle and momentum balance in spherical tokamaks, such as MAST [1]. These modifications serve to more accurately model the parallel electric fields present in the MAST SOL, which can alter plasma dynamics via the E × B drift. Simulations show that the electrical current at the divertor targets is predominantly thermoelectric, whereas Pfirsch–Schlüter currents have a greater contribution to the total current in the bulk of the SOL plasma.
