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DOE OSTI · 2589034

Case study for neoclassical electron transport and bootstrap current in the pedestal

Trinczek, Silvia [Princeton Plasma Physics Laboratory] (ORCID:0000000268685216)·Parra, Felix I. [Princeton Plasma Physics Laboratory] (ORCID:0000000196217404)·Catto, Peter J. [Massachusetts Institute of Technology] (ORCID:0000000203491736)
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Abstract

The Matlab files contain code used to generate the plots in our paper “Strong gradient effects on neoclassical electron transport and the bootstrap current”. There are three scripts dedicated to the sections 3,4 and 5 of the paper.

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Trinczek, Silvia [Princeton Plasma Physics Laboratory] (ORCID:0000000268685216), Parra, Felix I. [Princeton Plasma Physics Laboratory] (ORCID:0000000196217404), Catto, Peter J. [Massachusetts Institute of Technology] (ORCID:0000000203491736). 2025-04-15. Case study for neoclassical electron transport and bootstrap current in the pedestal. https://doi.org/10.34770/2zvn-wp92

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DOE OSTI2022

Critical role of current-driven instabilities for ELMs in NSTX

The impact of different extended-magnetohydrodynamic (MHD) contributions on the stability thresholds of peeling-ballooning modes in ELMing and ELM-free plasmas in the spherical tokamak NSTX is investigated with the initial value code M3D-C1. We show that ELMing discharges in NSTX are limited by resistive current-driven peeling modes, whereas non-ELMing wide-pedestal H-mode discharges are located near the ideal pressure-driven ballooning threshold. It is demonstrated that extended-MHD can lead to more reliable edge stability predictions than existing ideal-MHD models. Resistive peeling-ballooning modes are found to exist well before the ideal stability threshold is met, and kink-peeling modes exhibit considerable sensitivity to plasma resistivity. Other effects not considered in ideal-MHD models affect PB modes in NSTX in a weaker way. Gyroviscous stress appears stabilizing such that the stability boundary lies closer to the experimental point. Equilibrium rotation can suppress ideal core modes and thus isolate edge modes. These results are important for the development of a predictive pedestal model for low-aspect ratio tokamaks.

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