GTEDGE-2 A new predictive and interpretive edge-boundary transport capability.

A new code is being assembled for the tokamak plasma and neutral particle transport in the plasma edge, Scrape-Off Layer (SOL) and divertor. The new code will differ from existing codes by including ion orbit loss of thermalized ions and retaining electromagnetic ``pinch'' forces in the momentum balance, thus conserving particles, momentum and energy. Edge plasma transport is based on a 1D Flux-Surface Averaged (FSA) transport solution of the extended fluid theory incorporating ion orbit loss and electromagnetic particle pinch [1], with flux surface compression-expansion effects of gradients and Shafranov shift accounted for using the Miller model [2]. SOL-divertor plasma transport is initially based on a 1-D solution of the particle, momentum and energy equations in the core and edge plasma [3]. Neutral particle transport is based on the GTNEUT interface current balance code [4]. Theoretical models for the Code structure, integration and iteration issues are discussed. 1) Nucl. Fusion 57 (2017) 066034; 2) Phys. Plasmas 15 (2008) 122505; 3) Fusion Plasma Physics, Wiley-VCH (2012) sect 14.10; 4) Phys. Plasmas 13 (2006) 062509.