Blob wakes in NSTX

Zweben, S. J.; Myra, J. R.; Diallo, A.; Russell, D. A.; Scotti, F.; Stotler, D. P.

doi:10.1063/1.5094872

Title: Blob wakes in NSTX

Journal Article · 17 July 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5094872 · OSTI ID:1558756

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Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Lodestar Research Corp., Boulder, CO (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Transient small-scale structures were identified in the wake of blobs moving poloidally through the scrape-off layer of high-powered H-mode plasmas in NSTX, using the gas puff imaging (GPI) diagnostic. These blob wakes had a poloidal wavelength in the range of λ_pol = 3.5 ± 0.7 cm, which is significantly smaller than the average blob scale of L_pol ~12 cm, and the wakes had a poloidal velocity of V_pol = 1.5 ± 1.0 km/s in the electron diamagnetic direction, which is opposite to the blob poloidal velocity in these shots. These wakes were radially localized 0–4 cm outside the separatrix and occurred within ~50 μs after the passage of a blob through the GPI field of view. The clearest wakes were seen when the GPI viewing angle was well aligned with the local B field line, as expected for such small-scale structures given the diagnostic geometry. In conclusion, a plausible theoretical interpretation of the wakes is discussed: the observed wakes share some features of drift waves and/or drift-Alfvén waves which could be excited by the blobs.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; AC52-07NA27344; FG02-02ER54678

OSTI ID:: 1558756

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 26; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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