Application of MCGO-TORIC coupled codes to modeling of HHFW heating in NSTX

The 6D (optionally 5D) Monte-Carlo code MCGO [1] with RF kick operator has been further developed to allow coupling to full wave fields computed with AORSA or TORIC. The RF operator uses local quasilinear diffusion coefficients with all components of RF field and all-orders terms in Larmor radius. The MCGO-TORIC coupled modeling is applied for the case of High Harmonic Fast wave (HHFW) heating in NSTX, where fast ions (FI) are produced by NBI. Although MCGO uses a realistic NBI-to-FI deposition module, while TORIC calculations are based on equivalent-Maxwellian representation for FI, the agreement in RF power density profiles between TORIC and MCGO is very good. To facilitate a better verification between the codes, MCGO now includes an option for two-Maxwellian distributions. Furthermore, the MCGO runs are made in both zero-orbit-width (ZOW) and finite-orbit-width (FOW) configurations. In the latter case, the radial profiles of RF power density, fusion neutron rates become quite different from the ZOW runs. Also, the MCGO FOW runs allow computing of the increase in heat load to the chamber wall when RF is applied, that we show in our presentation.

[1] www.compxco.com/mcgo.html