Stabilizing effect of resistivity towards ELM-free H-mode discharge in lithium-conditioned NSTX

Banerjee, Debabrata; Zhu, Ping; Maingi, Rajesh

doi:10.1088/1741-4326/aa6b25

Stabilizing effect of resistivity towards ELM-free H-mode discharge in lithium-conditioned NSTX

Journal Article · Fri May 12 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa6b25· OSTI ID:1360935

Banerjee, Debabrata ^[1]; Zhu, Ping ^[2]; ^[3]

Univ. of Science and Technology of China, Hefei (China). CAS Key Lab. of Geospace Environment and Dept. of Modern Physics
Univ. of Science and Technology of China, Hefei (China). CAS Key Lab. of Geospace Environment and Dept. of Modern Physics; Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineerng Physics
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Linear stability analysis of the national spherical torus experiment (NSTX) Li-conditioned ELM-free H-mode equilibria is carried out in the context of the extended magneto-hydrodynamic (MHD) model in NIMROD. Our purpose is to investigate the physical cause behind edge localized mode (ELM) suppression in experiment after the Li-coating of the divertor and the first wall of the NSTX tokamak. Besides ideal MHD modeling, including finite-Larmor radius effect and two-fluid Hall and electron diamagnetic drift contributions, a non-ideal resistivity model is employed, taking into account the increase of Z eff after Li-conditioning in ELM-free H-mode. And unlike an earlier conclusion from an eigenvalue code analysis of these equilibria, NIMROD results find that after reduced recycling from divertor plates, profile modification is necessary but insufficient to explain the mechanism behind complete ELMs suppression in ideal two-fluid MHD. After considering the higher plasma resistivity due to higher Z eff, the complete stabilization could be explained. Furthermore, a thorough analysis of both pre-lithium ELMy and with-lithium ELM-free cases using ideal and non-ideal MHD models is presented, after accurately including a vacuum-like cold halo region in NIMROD to investigate ELMs.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

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

OSTI ID:: 1360935

Alternate ID(s):: OSTI ID: 22925772

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 7 Vol. 57; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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