Understanding the impact of insulating and conducting endplate boundary conditions on turbulence in CSDX through nonlocal simulations

Vaezi, P.; Holland, C.; Thakur, S. C.; Tynan, G. R.

doi:10.1063/1.4980843

Title: Understanding the impact of insulating and conducting endplate boundary conditions on turbulence in CSDX through nonlocal simulations

Journal Article · Wed Apr 19 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4980843· OSTI ID:1361823

^[1]; Holland, C. ^[1];

^[1]; Tynan, G. R. ^[1]

Univ. of California, San Diego, CA (United States). Center for Energy Research

The Controlled Shear Decorrelation Experiment (CSDX) linear plasma device provides a unique platform for investigating the underlying physics of self-regulating drift-wave turbulence/zonal flow dynamics. A minimal model of 3D drift-reduced nonlocal cold ion fluid equations which evolves density, vorticity, and electron temperature fluctuations, with proper sheath boundary conditions, is used to simulate dynamics of the turbulence in CSDX and its response to changes in parallel boundary conditions. These simulations are then carried out using the BOUndary Turbulence (BOUT++) framework and use equilibrium electron density and temperature profiles taken from experimental measurements. The results show that density gradient-driven drift-waves are the dominant instability in CSDX. However, the choice of insulating or conducting endplate boundary conditions affects the linear growth rates and energy balance of the system due to the absence or addition of Kelvin-Helmholtz modes generated by the sheath-driven equilibrium E × B shear and sheath-driven temperature gradient instability. Moreover, nonlinear simulation results show that the boundary conditions impact the turbulence structure and zonal flow formation, resulting in less broadband (more quasi-coherent) turbulence and weaker zonal flow in conducting boundary condition case. These results are qualitatively consistent with earlier experimental observations.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-06ER54871

OSTI ID:: 1361823

Alternate ID(s):: OSTI ID: 1420617; OSTI ID: 1423559

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Vol. 24 Journal Issue: 4; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Title: Understanding the impact of insulating and conducting endplate boundary conditions on turbulence in CSDX through nonlocal simulations

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