Disconnection of scrape off layer turbulence between the outer midplane and divertor target plate in NSTX

Scotti, F.; Zweben, S.; Myra, J.; Maqueda, R.; Soukhanovskii, V.

doi:10.1088/1741-4326/ab5886

Title: Disconnection of scrape off layer turbulence between the outer midplane and divertor target plate in NSTX

Journal Article · 18 December 2019 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ab5886 · OSTI ID:1643699

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Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Lodestar Research Corporation, Boulder, CO (United States)
X Science LLC, Plainsboro, NJ (United States)

The connection between scrape off layer (SOL) turbulence at the outer midplane and at the divertor target plate is characterized in the National Spherical Torus Experiment (NSTX). In this work, divertor fluctuations due to midplane blobs are studied by imaging their helical intersection with the divertor plate. Divertor fluctuation levels gradually decrease approaching the outer strike point. Divertor radial turbulence scale lengths as well as radial and poloidal turbulence propagation velocities are comparable to those on the low field side midplane. Strong correlation between divertor and midplane turbulence is observed in the far SOL. The correlation progressively decreases towards the separatrix, along with the decrease in the measured divertor fluctuations. The reduction in correlation is consistent with an electrostatic two-region blob model with perpendicular ion polarization currents due to X-point geometry causing filament disconnection.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: AC02-09CH11466; AC52-07NA27344; FG02-97ER54392

OSTI ID:: 1643699

Alternate ID(s):: OSTI ID: 1642353

Report Number(s):: LLNL-JRNL-774768; TRN: US2201961

Journal Information:: Nuclear Fusion, Vol. 60, Issue 2; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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