Correlation between the relative blob fraction and plasma parameters in NSTX

Zweben, S. J.; Banerjee, S.; Bisai, N.; Diallo, A.; Lampert, M.; LeBlanc, B.; Myra, J. R.; Russell, D. A.

doi:10.1063/5.0074261

Title: Correlation between the relative blob fraction and plasma parameters in NSTX

Journal Article · Tue Jan 18 00:00:00 EST 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0074261· OSTI ID:1886887

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Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Institute for Plasma Research (India); Homi Bhabha National Institute (HBNI) (India)
Lodestar Research Corporation, Boulder, CO (United States)

Here, we present a simple analysis of the fraction of blobs observed in the scrape-off layer of NSTX and calculates the correlation between this blob fraction and various plasma parameters. The measurements were made using the gas puff imaging (GPI) diagnostic on a database of 103 shots from 2010 with neutral beam power P_NBI = 0–6 MW. The blob fraction ranged from f_b = 0.1% to 4.8%, where f_b is defined as the fraction of time the GPI signal was larger than three times its average value within 0–7.5 cm outside the separatrix. The blob fraction generally decreased with increasing neutral beam injection power and was lower on average in H-mode plasmas than Ohmic and L-mode plasmas. The blob fraction had its highest correlation with the measured poloidal turbulence velocity and its radial gradient just inside the separatrix. This is in part consistent with a model in which the blob generation rate increases with the poloidal velocity shear.

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

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

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

OSTI ID:: 1886887

Alternate ID(s):: OSTI ID: 1840781

Journal Information:: Physics of Plasmas, Vol. 29, Issue 1; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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