Stabilizing effects of enhanced resistivity due to lithium-conditioning on low-n edge localized modes in NSTX

Banerjee, Debabrata; Zhu, Ping; Maingi, Rajesh

doi:10.1063/1.4981931

Title: Stabilizing effects of enhanced resistivity due to lithium-conditioning on low-n edge localized modes in NSTX

Journal Article · 23 April 2017 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.4981931 · OSTI ID:1543833

^[1];

^[2]; Maingi, Rajesh ^[3]

Univ. of Science and Technology of China, Anhui (China)
Univ. of Science and Technology of China, Anhui (China); Univ. of Wisconsin-Madison, Madison, WI (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

The stabilizing effects of enhanced edge resistivity on edge-localized instabilities in high confinement discharges due to lithium-conditioning in the National Spherical Torus Experiment are identified for the first time. Linear stability analysis of the experimentally constrained equilibrium suggests that the change in the equilibrium plasma density and pressure profiles alone due to lithium-conditioning may be insufficient for a complete suppression of low toroidal mode number peeling-ballooning modes. In conclusion, the enhanced resistivity due to the increased effective electric charge number Z_eff after lithium-conditioning provides additional stabilization of the edge localized modes. Notably, this stabilizing effect by enhanced edge resistivity becomes evident only in two-fluid magnetohydrodynamic simulations.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); Princeton Univ., Princeton, NJ (United States); Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; AC02-09CH11466; FC02-08ER54975; FG02-86ER53218

OSTI ID:: 1543833

Alternate ID(s):: OSTI ID: 1361843

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 24; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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