Direct measurements of the 3D plasma velocity in single-helical-axis RFP plasmas

Boguski, J.; Nornberg, M. D.; Gupta, U.; McCollam, K. J.; Almagri, A. F.; Chapman, B. E.; Craig, D.; Nishizawa, T.; Sarff, J. S.; Sovinec, C. R.; Terry, P. W.; Xing, Z. A.

doi:10.1063/5.0025696

Title: Direct measurements of the 3D plasma velocity in single-helical-axis RFP plasmas

Journal Article · Thu Jan 21 00:00:00 EST 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0025696· OSTI ID:1849043

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^[1]; McCollam, K. J. ^[1]; Almagri, A. F. ^[3];

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^[5]; Terry, P. W. ^[1]; Xing, Z. A. ^[1]

Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics
Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
Department of Physics, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA
Wheaton College, Wheaton, IL (United States). Dept. of Physics
Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics; Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics

The first local velocity measurements of helical equilibrium plasmas in the Reversed Field Pinch (RFP) Single Helical Axis (SHAx) state using a Charge Exchange Recombination Spectroscopy (CHERS) diagnostic are presented. Measurements show strong axisymmetric and non-axisymmetric flow, with n = 5 components of flow related to the (m,n)=(1,5) dominant magnetic mode on the order of the axisymmetric flow in certain regions of the plasma, as well as significant n > 5 flow. Flow measurements are compared with NIMROD simulations of visco-resistive, single-fluid MHD in toroidal and cylindrical geometries with limited axial periodicity. Both measurements and the simulation with toroidal geometry show stronger inboard flows relative to the outboard flows, which is attributed to the toroidal geometry of the device. In the experiment, the n = 5 component of flow is phase shifted from the reconnection-like flow pattern observed in the single-fluid simulations, possibly due to decoupling of the ion and electron fluids over much of the plasma. Finally, the strength of the helical angular flow shear relative to the critical shear necessary to disrupt nonlinear coupling between tearing modes is calculated around the helical magnetic axis. The shear in the measured flow is on the order of the theoretical critical threshold needed to nonlinearly decouple modes, but the measurement uncertainty in the gradient of the flow is large.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States); Univ. of California, Oakland, CA (United States)

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

Grant/Contract Number:: FC02-05ER54814; FG02-85ER53212; SC0018266; AC02-05CH11231; FC02- 05ER54814

OSTI ID:: 1849043

Alternate ID(s):: OSTI ID: 1761250

Journal Information:: Physics of Plasmas, Vol. 28, Issue 1; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Title: Direct measurements of the 3D plasma velocity in single-helical-axis RFP plasmas

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