Driving large magnetic Reynolds number flow in highly ionized, unmagnetized plasmas

Weisberg, D. B.; Peterson, E.; Milhone, J.; Endrizzi, D.; Cooper, C.; Désangles, V.; Khalzov, Ivan; Siller, R.; Forest, C. B.

doi:10.1063/1.4978889

Driving large magnetic Reynolds number flow in highly ionized, unmagnetized plasmas

Journal Article · Wed Mar 22 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4978889· OSTI ID:1883438

Weisberg, D. B. ^[1]; Peterson, E. ^[2]; Milhone, J. ^[2]; Endrizzi, D. ^[2]; Cooper, C. ^[3]; Désangles, V. ^[4]; ^[5]; Siller, R. ^[2]; Forest, C. B. ^[2]

Oak Ridge Associated Univ., Oak Ridge, TN (United States); Univ. of Wisconsin, Madison, WI (United States)
Univ. of Wisconsin, Madison, WI (United States)
Univ. of Wisconsin, Madison, WI (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Lyon (France)
Univ. of Wisconsin, Madison, WI (United States); National Research Centre, Moscow (Russian Federation). Kurchatov Institute

Electrically driven, unmagnetized plasma flows have been generated in the Madison plasma dynamo experiment with magnetic Reynolds numbers exceeding the predicted Rm_crit = 200 threshold for flow-driven MHD instability excitation. The plasma flow is driven using ten thermally emissive lanthanum hexaboride cathodes which generate a J × B torque in helium and argon plasmas. Detailed Mach probe measurements of plasma velocity for two flow topologies are presented: edge-localized drive using the multi-cusp boundary field and volumetric drive using an axial Helmholtz field. Here radial velocity profiles show that the edge-driven flow is established via ion viscosity but is limited by a volumetric neutral drag force, and measurements of velocity shear compare favorably to the Braginskii transport theory. Volumetric flow drive is shown to produce larger velocity shear and has the correct flow profile for studying the magnetorotational instability.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: French National Research Agency (ANR); National Center for Scientific Research (CNRS); National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; SC0008709

OSTI ID:: 1883438

Alternate ID(s):: OSTI ID: 1349386

Report Number(s):: LLNL-JRNL-753144; 939304

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 24; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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