Intrinsic plasma rotation and Reynolds stress at the plasma edge in the HSX stellarator

Wilcox, Robert S.; Talmadge, J. N.; Anderson, David T.; Anderson, F. S. B.; Lore, Jeremy D.

doi:10.1088/0029-5515/56/3/036002

Title: Intrinsic plasma rotation and Reynolds stress at the plasma edge in the HSX stellarator

Journal Article · Fri Feb 05 00:00:00 EST 2016 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/56/3/036002· OSTI ID:1266023

Wilcox, Robert S. ^[1]; Talmadge, J. N. ^[2]; Anderson, David T. ^[2]; Anderson, F. S. B. ^[2]; Lore, Jeremy D. ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Wisconsin, Madison, WI (United States)
Univ. of Wisconsin, Madison, WI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Using multi-tipped Langmuir probes in the edge of the HSX stellarator, the radial electric field and parallel flows are found to deviate from the values calculated by the neoclassical transport code PENTA for the optimized quasi-helically symmetric (QHS) configuration. To understand whether Reynolds stress might explain the discrepancy, fluctuating floating potential measurements are made at two locations in the torus corresponding to the low field and high field sides of the device. The measurements at the two locations show clear evidence of a gradient in the Reynolds stress. However, the resulting flow due to the gradient in the stress is found to be large and in opposite directions for the two locations. This makes an estimation of the flux surface average using a small number of measurement locations impractical from an experimental perspective. These results neither confirm nor rule out whether Reynolds stress plays an important role for the QHS configuration. Measurements made in configurations with the quasi-symmetry degraded show even larger flows and greater deviations from the neoclassically calculated velocity profiles than the QHS configuration while the fluctuation magnitudes are reduced. Lastly, for these configurations in particular, the Reynolds stress is most likely not responsible for the additional momentum.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725; FG02-93ER54222

OSTI ID:: 1266023

Alternate ID(s):: OSTI ID: 1236980

Journal Information:: Nuclear Fusion, Vol. 56, Issue 3; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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Magnetic configuration effects on the Reynolds stress in the plasma edge Manz, P.; Stegmeir, A.; Schmid, B. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5037511	journal	July 2018
The role of neutral friction in governing parallel flows in the HSX stellarator Dobbins, T. J.; Kumar, S. T. A.; Talmadge, J. N. Nuclear Fusion, Vol. 59, Issue 4 https://doi.org/10.1088/1741-4326/aaff9f	journal	February 2019

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