Stabilizing effect of enhanced resistivity on peeling-ballooning instabilities on EAST
Abstract
Previous stability analysis of NSTX equilibrium with lithium-conditioning demonstrates that the enhanced resistivity due to the increased effective charge number Zeff (i.e. increased impurity level) can provide a stabilizing effect on low-n edge localized modes (Banerjee et al 2017 Nucl. Fusion 24 054501). This paper extends the resistivity stabilizing effect to the intermediate-n peeling-ballooning (PB) instabilities with the linear stability analysis of EAST high-confinement mode equilibria in NIMROD two-fluid calculations. However, the resistivity stabilizing effect on PB instabilities in the EAST tokamak appears weaker than that found in NSTX. This work may give better insight into the physical mechanism behind the beneficial effects of impurity on the pedestal stability.
Keywords
Cite
@article{arxiv.1909.06009,
title = {Stabilizing effect of enhanced resistivity on peeling-ballooning instabilities on EAST},
author = {Xin Lin and Debabrata Banerjee and Ping Zhu and Guosheng Xu and Yang Ye and Yifeng Wang and Qing Zang and Tao Zhang and Yingjie Chen},
journal= {arXiv preprint arXiv:1909.06009},
year = {2020}
}