Gyrokinetic continuum simulations of plasma turbulence in the Texas Helimak

@article{Bernard2019GyrokineticCS,
  title={Gyrokinetic continuum simulations of plasma turbulence in the Texas Helimak},
  author={T. N. Bernard and E. L. Shi and Kenneth W. Gentle and Ammar H. Hakim and Gregory W. Hammett and T. Stoltzfus-Dueck and E. I. Taylor},
  journal={Physics of Plasmas},
  year={2019}
}
The first gyrokinetic simulations of plasma turbulence in the Texas Helimak device, a simple magnetized torus, are presented. The device has features similar to the scrape-off layer region of tokamaks, such as bad-curvature-driven instabilities and sheath boundary conditions on the end plates, which are included in these simulations. Comparisons between simulations and measurements from the experiment show similarities, including equilibrium profiles and fluctuation amplitudes that approach… 
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A Deep Dive into the Distribution Function: Understanding Phase Space Dynamics with Continuum Vlasov-Maxwell Simulations
  • J. Juno
  • Physics, Computer Science
    ArXiv
  • 2020
TLDR
A new algorithm for the discretization of VM-FP system of equations for the study of plasmas in the kinetic regime is presented and it is demonstrated how the high fidelity representation of the distribution function permits detailed analysis of the energization mechanisms in fundamental plasma processes such as collisionless shocks.
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References

SHOWING 1-10 OF 78 REFERENCES
Plasma transport and turbulence in the Helimak: Simulation and experiment
The Helimak experiment produces a toroidal plasma with a helical magnetic field. A simulation-experiment comparison of turbulence in this device is presented, focusing on parameter regimes in which
Full-fgyrokinetic simulation of turbulence in a helical open-field-line plasma
Curvature-driven turbulence in a helical open-field-line plasma is investigated using electrostatic five-dimensional gyrokinetic continuum simulations in an all-bad-curvature helical-slab geometry.
Texas Helimak
Helimak is an experimental approximation to the ideal cylindrical slab, a one-dimensional magnetized plasma with magnetic curvature and shear. The Texas Helimak realizes this approximation to a large
Nonlinear Dynamics in the Tokamak Edge
The nonlinear character of the tokamak edge results from a unique combination of parameters, leading to a wide dynamical range for most processes. The energetically consistent gyrokinetic equilibrium
Developments in the gyrofluid approach to Tokamak turbulence simulations
A status report is given on developments in the gyrofluid approach to simulating tokamak turbulence. 'Gyrofluid' (r 'gyro-Landau fluid') equations attempt to extend the range of validity of fluid
Computation of electromagnetic turbulence and anomalous transport mechanisms in tokamak plasmas
The basic scales of motion and computational requirements for low frequency fluid drift turbulence are summarized in tutorial fashion. Basic signatures for each of the competing eigenmode types are
Gyrokinetic Continuum Simulation of Turbulence in Open-Field-Line Plasmas
The properties of the boundary plasma in a tokamak are now recognized to play a key role in determining the achievable fusion power and the lifetimes of plasma-facing components. Accurate
High- and low-confinement modes in simple magnetized toroidal plasmas.
Three-field simulations of interchange turbulence are presented for a simple magnetized toroidal plasma with a vertical magnetic field. The simulations show the presence of two turbulent regimes
Turbulence in the cylindrical slab
The cylindrical slab was the first and simplest model of intrinsically unstable microturbulence. The Helimak is an experimental realization of this model. Although finite, it is sufficiently large to
A Gyrokinetic 1D Scrape-Off Layer Model of an ELM Heat Pulse
We have applied an electrostatic gyrokinetic-based model to simulate parallel plasma transport in the scrapeoff layer to a divertor plate. We focus on a test problem that has been studied previously,
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