Application of EMC 3-EIRENE to NCSX

The National Compact Stellarator eXperiment (NCSX) [1] is a quasi-axisymmetric stellarator under construction at the Princeton Plasma Physics Laboratory. The three fieldperiod device has a major radius of 1.4 m and an average aspect ratio of 4.4, with up to 6 MW of neutral beam injection planned. The edge of a typical NCSX magnetic configuration is characterized by a region of stochastic magnetic field lines, with areas of large flux expansion that allow the isolation of plasma-wall interactions. We have investigated the use of toroidally non-continuous target plates to collect the plasma exhaust power; magnetic field line calculations have shown that such a design is capable of intercepting the majority of the power flux [2,3]. As part of the design of plasma facing components for NCSX, the EMC3-EIRENE code [4] has been implemented to model the scrape-off-layer plasma [5]. EMC3 uses a Monte Carlo technique to solve the fluid transport equations in three dimensions and has been coupled to the neutral transport code EIRENE [6], allowing the self consistent calculation of plasma/neutral transport in the scrape-off layer (SOL) and the expected particle and heat fluxes to target plates. In this paper, we present the results of the application of the full set of transport equations in EMC3-EIRENE, including energy, mass, momentum, and impurity transport, to model NCSX SOL plasmas. f=0 ̊ f=15 ̊ f=30 ̊