# Turbulent momentum transport due to neoclassical flows

@article{Lee2015TurbulentMT, title={Turbulent momentum transport due to neoclassical flows}, author={Jungpyo Lee and Michael Barnes and Felix I. Parra and Emily A. Belli and Jeff Candy}, journal={Plasma Physics and Controlled Fusion}, year={2015}, volume={57} }

Intrinsic toroidal rotation in a tokamak can be driven by turbulent momentum transport due to neoclassical flow effects breaking a symmetry of turbulence. In this paper we categorize the contributions due to neoclassical effects to the turbulent momentum transport, and evaluate each contribution using gyrokinetic simulations. We find that the relative importance of each contribution changes with collisionality. For low collisionality, the dominant contributions come from neoclassical particle…

## 16 Citations

### Intrinsic rotation driven by turbulent acceleration

- PhysicsPlasma Physics and Controlled Fusion
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### Impurity transport in tokamak plasmas, theory, modelling and comparison with experiments

- PhysicsPlasma Physics and Controlled Fusion
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### DIII-D shaping demonstrates correlation of intrinsic momentum with energy

- PhysicsNuclear Fusion
- 2019

Scaling of intrinsic rotation in DIII-D H-mode plasmas demonstrates a strong correlation with the ion temperature (Ti) and stored plasma thermal energy, indicating a coupling between the turbulent…

### Dimensionless Size Scaling of Intrinsic Rotation

- Physics, Engineering
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€ Vφ = Rωφ , without any auxiliary injected torque, as typically applied by neutral beam injection (NBI). Ultimately the necessary source of torque to sustain this rotation must pass through the…

## References

SHOWING 1-10 OF 43 REFERENCES

### Intrinsic rotation driven by non-Maxwellian equilibria in Tokamak plasmas.

- PhysicsPhysical review letters
- 2013

A collisionality-dependent transition from peaked to hollow rotation profiles, consistent with experimental observations of intrinsic rotation, is indicated.

### Toroidal momentum transport in a tokamak due to profile shearing

- Physics
- 2014

The effect of profile shearing on toroidal momentum transport is studied in linear and non-linear gyro-kinetic simulations. Retaining the radial dependence of both plasma and geometry parameters…

### Anomalous parallel momentum transport due to E×B flow shear in a tokamak plasma

- Physics
- 2009

Nondiffusive anomalous momentum transport in toroidal plasmas occurs through symmetry breaking mechanisms. In this paper the contribution of sheared E X B flows to parallel momentum transport [R. R.…

### Up-down symmetry of the turbulent transport of toroidal angular momentum in tokamaks

- Physics
- 2011

Two symmetries of the local nonlinear δf gyrokinetic system of equations in tokamaks in the high flow regime are presented. The turbulent transport of toroidal angular momentum changes sign under an…

### The effect of diamagnetic flows on turbulent driven ion toroidal rotationa)

- Physics
- 2014

Turbulent momentum redistribution determines the radial profile of rotation in a tokamak. The momentum transport driven by diamagnetic flow effects is an important piece of the radial momentum…

### Turbulent transport in tokamak plasmas with rotational shear.

- Physics, EngineeringPhysical review letters
- 2011

Nonlinear gyrokinetic simulations are conducted to investigate turbulent transport in tokamak plasmas with rotational shear, finding the turbulent Prandtl number to be largely independent of temperature and flow gradients.

### Momentum injection in tokamak plasmas and transitions to reduced transport.

- PhysicsPhysical review letters
- 2011

The effect of momentum injection on the temperature gradient in tokamak plasmas is studied. A plausible scenario for transitions to reduced transport regimes is proposed. The transition happens when…

### 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…

### Transport bifurcation in a rotating tokamak plasma.

- Physics, EngineeringPhysical review letters
- 2010

A bifurcation in the equilibrium gradients is found: for a given input of heat, it is possible, by varying the applied torque, to trigger a transition to significantly higher temperature and flow gradients.

### Observation of anomalous momentum transport in tokamak plasmas with no momentum input.

- PhysicsPhysical review letters
- 2003

Anomalous momentum transport has been observed in Alcator C-Mod tokamak plasmas through analysis of the time evolution of core impurity toroidal rotation velocity profiles. Following the L-mode to…