Increased particle transport due to resonant magnetic perturbations modelled with a vacuum field line tracing code and a 2D fluid code

摘要

In this paper we compare the pedestal density changes in resonant magnetic perturbations (RMP) H-modes at low collisionality with enhanced free streaming due to the creation of open field lines. First, we derive the effective radial transport coefficients by matching an ELMing (edge localized mode) H-mode using SOLPS5. Next, a vacuum field line tracing code, TRIP3D, is employed to calculate free streaming of particles along open field lines inside the traditional 2D axisymmetric separatrix. These coefficients are added to the effective radial transport coefficients from the ELMing H-mode and inserted in SOLPS5 to compute midplane profiles. Finally, we compare the SOLPS5 results with the experimental data from RMP H-modes and find good agreement. This good agreement was achieved not only for one single case, but also for two different experiments, with different triangularities, where the high triangularity case contains two RMP H-modes that give good agreement.