Stabilizing effect of enhanced resistivity on peeling-ballooning instabilities on EAST

Debabrata Banerjee; Guosheng Xu; Ping Zhu; Qing Zang; Tao Zhang; Xin Lin; Yang Ye; Yifeng Wang; Yingjie Chen

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Stabilizing effect of enhanced resistivity on peeling-ballooning instabilities on EAST

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arxiv 1909.06009 v1 pith:FM6HND4W submitted 2019-09-13 physics.plasm-ph

Xin Lin , Debabrata Banerjee , Ping Zhu , Guosheng Xu , Yang Ye , Yifeng Wang , Qing Zang , Tao Zhang

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Yingjie Chen

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classification physics.plasm-ph

keywords effectresistivitystabilizingeastinstabilitiesstabilityanalysisenhanced

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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.

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