Energy dynamics in a simulation of LAPD turbulence

  title={Energy dynamics in a simulation of LAPD turbulence},
  author={B. Friedman and Troy A. Carter and M. V. Umansky and David A. Schaffner and B. D. Dudson},
  journal={Physics of Plasmas},
Energy dynamics calculations in a 3D fluid simulation of drift wave turbulence in the linear Large Plasma Device [W. Gekelman et al., Rev. Sci. Instrum. 62, 2875 (1991)] illuminate processes that drive and dissipate the turbulence. These calculations reveal that a nonlinear instability dominates the injection of energy into the turbulence by overtaking the linear drift wave instability that dominates when fluctuations about the equilibrium are small. The nonlinear instability drives flute-like… 

Nonlinear instability in simulations of Large Plasma Device turbulence

Several simulations of turbulence in the Large Plasma Device (LAPD) [Gekelman et al., Rev. Sci. Instrum. 62, 2875 (1991)] are energetically analyzed and compared with each other and with the

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

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

Nonlinear Simulation, Validation Study, and Uncertainty Quantification of Drift-turbulence in CSDX Linear Plasma Device

Author(s): Vaezi, Payam | Advisor(s): Tynan, George R | Abstract: The Controlled Shear Decorrelation Experiment (CSDX) linear plasma device provides a unique platform for investigating the underlying

Simulations of drift resistive ballooning L-mode turbulence in the edge plasma of the DIII-D tokamaka)

Results from simulations of electromagnetic drift-resistive ballooning turbulence for tokamak edge turbulence in realistic single-null geometry are reported. The calculations are undertaken with the

Generalized universal instability: transient linear amplification and subcritical turbulence

In this work we numerically demonstrate both significant transient (i.e. non-modal) linear amplification and sustained nonlinear turbulence in a kinetic plasma system with no unstable eigenmodes. The

Nonlinear competition of turbulent structures and improved confinement in magnetized cylindrical plasmas

Nonlinear competition of turbulent structures and their roles in transport are investigated by using three-dimensional simulation code of resistive drift wave turbulence in magnetized cylindrical

Intrinsic suppression of turbulence in linear plasma devices

Plasma turbulence is the dominant transport mechanism for heat and particles in magnetised plasmas in linear devices and tokamaks, so the study of turbulence is important in limiting and controlling

Three-dimensional two-fluid Braginskii simulations of the large plasma device

The Large Plasma Device (LAPD) is modeled using the 3D Global Braginskii Solver code. Comparisons to experimental measurements are made in the low-bias regime in which there is an intrinsic E × B

Gyrokinetic continuum simulation of turbulence in a straight open-field-line plasma

Five-dimensional gyrokinetic continuum simulations of electrostatic plasma turbulence in a straight, open-field-line geometry have been performed using a full- $f$ discontinuous-Galerkin approach

Turbulence and transport suppression scaling with flow shear on the Large Plasma Devicea)

Continuous control over azimuthal flow and shear in the edge of the Large Plasma Device (LAPD) [W. Gekelman et al., Rev. Sci. Instr. 62, 2875 (1991)] has been achieved using a biasable limiter. This



Numerical simulation and analysis of plasma turbulence the Large Plasma Devicea)

Turbulence calculations with a 3D collisional fluid plasma model demonstrate qualitative and semi-quantitative similarity to experimental data in the Large Plasma Device [W. Gekelman et al., Rev.

The mechanism of self-sustainment in collisional drift wave turbulence

Although collisional drift waves in a sheared slab configuration are linearly damped, the corresponding turbulence is self‐sustaining if initialized at an electrostatic potential fluctuation

Electron Temperature Fluctuations in Drift-Resistive Ballooning Turbulence

Three-dimensional nonlinear simulations of collisional plasma turbulence are presented to model the behavior of the edge region of tokamak discharges. Previous work is extended by including electron

Nonlinear stability and instability in collisionless trapped electron mode turbulence

A two-field model for collisionless trapped electron mode turbulence has both finite amplitude-induced stability and instability, depending on wave number. Effects usually identified with nonlinear

Drift Wave versus Interchange Turbulence in Tokamak Geometry: Linear versus Nonlinear Mode Structure

The competition between drift wave and interchange physics in general E-cross-B drift turbulence is studied with computations in three-dimensional tokamak flux tube geometry. For a given set of

The nonlinear drift wave instability and its role in tokamak edge turbulence

  • B. Scott
  • Physics, Environmental Science
  • 2002
Drift wave turbulence, in general a balance between E×B drift turbulence in planes perpendicular to, and dissipative wave dynamics parallel to, a background magnetic field, is a hallmark example of

Energetic study of the transition to nonlinear state in two-dimensional electron temperature gradient fluid turbulence

Eigenmode projection has been used in analysis of the two-dimensional numerical solution of electron temperature gradient (ETG) turbulence. The secondary Kelvin–Helmholtz instability (KHI) that

Nonlinear inward particle flux component in trapped electron mode turbulence

Trapped electron turbulence is shown to have a significant inward particle flux component associated with nonlinear deviations of the density-potential cross correlation from the quasilinear value.

Three‐dimensional fluid simulations of tokamak edge turbulence

Three‐dimensional (3‐D) simulations of drift‐resistive ballooning turbulence are presented. The turbulence is basically controlled by a parameter α, the ratio of the drift wave frequency to the ideal

Nonlinear Instability Mechanism in 3D Collisional Drift-Wave Turbulence.

Numerical simulations of 3D collisional drift-wave turbulence reveal a behavior basically different from that found in previous 2D studies, which tends to relax to a nonturbulent poloidal shear flow.