# The collisional drift wave instability in steep density gradient regimes.

@article{Held2018TheCD, title={The collisional drift wave instability in steep density gradient regimes.}, author={Markus Held and Matthias Wiesenberger and Alexander Kendl}, journal={arXiv: Plasma Physics}, year={2018} }

The collisional drift wave instability in a straight magnetic field configuration is studied within a full-F gyro-fluid model, which relaxes the Oberbeck-Boussinesq (OB) approximation. Accordingly, we focus our study on steep background density gradients. In this regime we report on corrections by factors of order one to the eigenvalue analysis of former OB approximated approaches as well as on spatially localised eigenfunctions, that contrast strongly with their OB approximated equivalent…

## 3 Citations

Angular momentum and rotational energy of mean flows in toroidal magnetic fields

- Physics
- 2020

We derive the balance equation for the Favre averaged angular momentum in toroidal not necessarily axisymmetric magnetic field equilibria. We find that the components of angular momentum are given by…

Padé-based arbitrary wavelength polarization closures for full-F gyro-kinetic and -fluid models

- PhysicsNuclear Fusion
- 2020

We propose a solution to the long-standing short wavelength polarization closure shortfall of full-F gyro-fluid models. This is achieved by first finding an appropriate quadratic form of the…

Reproducibility, accuracy and performance of the Feltor code and library on parallel computer architectures

- Computer ScienceComput. Phys. Commun.
- 2019

## References

SHOWING 1-10 OF 97 REFERENCES

Temporal evolution of linear drift waves in a collisional plasma with homogeneous shear flow

- Physics
- 2000

Temporal evolution of linear drift waves in a collisional plasma with a homogeneous shear flow is treated analytically. The explicit solutions for the linearized Hasegawa–Wakatani system of…

Self-sustained collisional drift-wave turbulence in a sheared magnetic field.

- PhysicsPhysical review letters
- 1990

It is found that the corresponding turbulence is self-sustaining if initialized at nonlinear amplitude, and several important features of tokamak edge fluctuations are reproduced by these single-rational-surface nonlinear dynamics.

Theory of dissipative drift instabilities in sheared magnetic fields

- Physics
- 1979

Several different techniques are used to study the stability of electrostatic drift wave eigenmodes in a resistive plasma with finite magnetic shear. It is found that in the slab approximation, where…

Bifurcation in electrostatic resistive drift wave turbulence

- Physics
- 2007

The Hasegawa-Wakatani equations, coupling plasma density, and electrostatic potential through an approximation to the physics of parallel electron motions, are a simple model that describes resistive…

The mechanism of self-sustainment in collisional drift wave turbulence

- Physics
- 1992

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…

Generalized universal instability: transient linear amplification and subcritical turbulence

- PhysicsJournal of Plasma Physics
- 2015

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…

Drift wave dispersion relation for arbitrarily collisional plasma

- Physics, Geology
- 2012

The standard local linear analysis of drift waves in a plasma slab is generalized to be valid for arbitrarily collisional electrons by considering the electrons to be governed by the drift-kinetic…

Drift waves and transport

- Physics
- 1999

Drift waves occur universally in magnetized plasmas producing the dominant mechanism for the transport of particles, energy and momentum across magnetic field lines. A wealth of information obtained…

Theory of the Drift-Wave Instability at Arbitrary Collisionality.

- PhysicsPhysical review letters
- 2018

A numerically efficient framework that takes into account the effect of the Coulomb collision operator at arbitrary collisionalities is introduced and makes the representation of the velocity space dependence, including the full collision operator, more efficient than standard finite difference methods.

On drift wave instabilities excited by strong plasma gradients in toroidal plasmas

- Physics
- 2018

Motivated by the recent global gyrokinetic simulations of electrostatic drift-wave instabilities in the strong plasma gradient region of toroidal plasmas [Fulton et al., Phys. Plasmas 21, 042110…