Turbulent transport of alpha particles in tokamak plasmas

@article{Croitoru2016TurbulentTO,
title={Turbulent transport of alpha particles in tokamak plasmas},
author={Andreea Croitoru and Dragos Iustin Palade and Madalina Vlad and Florin Spineanu},
journal={Nuclear Fusion},
year={2016},
volume={57}
}
• Published 28 March 2016
• Physics
• Nuclear Fusion
We investigate the E×B diffusion of fusion born α particles in tokamak plasmas. We determine the transport regimes for a realistic model that has the characteristics of the ion temperature gradient (ITG) or of the trapped electron mode (TEM) driven turbulence. It includes a spectrum of potential fluctuations that is modeled using the results of the numerical simulations, the drift of the potential with the effective diamagnetic velocity and the parallel motion. Our semi-analytical statistical…
7 Citations

Effects of magnetic drifts on ion transport in turbulent tokamak plasmas

The stochastic advection of low energy deuterium ions is studied in a three dimensional realistic turbulence model in conditions relevant for current tokamak fusion experiments. The diffusion

Turbulent transport of fast ions in tokamak plasmas in the presence of resonant magnetic perturbations

The effects of resonant magnetic perturbations on the turbulent transport of fast ions in tokamak devices are investigated using a theoretical transport model of test-particle type. The direct

Effects of the parallel acceleration on heavy impurity transport in turbulent tokamak plasmas

• Physics
• 2020
A process specific to the dynamics of the heavy impurities in turbulent tokamak plasmas is found and analyzed. We show that the parallel stochastic acceleration is strongly coupled to the

Turbulent transport of the W ions in tokamak plasmas: properties derived from a test particle approach

• Physics
Nuclear Fusion
• 2021
A detailed analysis of a special type of turbulent pinch mechanism for tungsten (W) ions is presented. It is based on the numerical simulation of ion trajectories in a complex test-particle model

Non-diffusive nature of collisionlessα-particle transport: Dependence on toroidal symmetry in stellarator geometries

• Physics
• 2020
An adequate confinement of α-particles is fundamental for the operation of future fusion powered reactors. An even more critical situation arises for stellarator devices, whose complex magnetic

Two-fluid burning-plasma analysis for magnetic confinement fusion devices

• Physics
Plasma Physics and Controlled Fusion
• 2019
The two-fluid, Lawson-type ignition model of (Guazzotto and Betti 2017 Phys. Plasmas 24 082504) for nuclear fusion concepts is extended to burning-plasmas. Numerical estimates for the Lawson product

Effects of intermittency via non-Gaussianity on turbulent transport in magnetized plasmas

• Physics
Journal of Plasma Physics
• 2022
We analyse how the turbulent transport of $\boldsymbol {E}\times \boldsymbol {B}$ type in magnetically confined plasmas is affected by the intermittent features of turbulence. The latter are modelled

References

SHOWING 1-10 OF 46 REFERENCES

Mechanisms and scalings of energetic ion transport via tokamak microturbulence

• Physics
• 2008
The turbulent E×B advection of energetic ions in three-dimensional tokamak geometry is investigated both analytically and numerically. It is shown that orbit averaging (leading to a significant

Test particle study of ion transport in drift type turbulence

• Physics
• 2013
Ion transport regimes in drift type turbulence are determined in the frame of a realistic model for the turbulence spectrum based on numerical simulations. The model includes the drift of the

Turbulent transport of alpha particles in reactor plasmas

• Physics
• 2006
A systematic study of the behavior of energetic ions in reactor plasmas is presented. Using self-consistent gyrokinetic simulations, in concert with an analytic asymptotic theory, it is found that

Transport of energetic particles by microturbulence in magnetized plasmas.

• Physics
Physical review letters
• 2008
The diffusivity is found to decrease drastically for high energy particles due to the averaging effects of the large gyroradius and orbit width, and the fast decorrelation of the energetic particles with the waves.

Turbulent Transport of Fast Ions in the Large Plasma Device (LAPD)

• Physics
• 2010
Strong drift wave turbulence is observed in the Large Plasma Device [H. Gekelman et al., Rev. Sci. Instrum. 62, 2875 (1991)] on density gradients produced by a plate limiter. Energetic lithium ions

Scalings of energetic particle transport by ion temperature gradient microturbulencea)

• Physics, Engineering
• 2010
Transport scaling of energetic particles by ion temperature gradient microturbulence in magnetized plasmas is studied in massively paralleled gyrokinetic particle-in-cell simulations. It is found

Electron heat transport regimes in multi-scale turbulence

• Physics
• 2015
Electron heat transport is studied in the framework of the test particle approach using a semi-analytical method. We consider multi-scale turbulence with a range of correlation lengths λ that covers

Dependence of fast-ion transport on the nature of the turbulence in the Large Plasma Device

• Physics
• 2011
Strong turbulent waves (δn/n ∼0.5, f ∼5-40 kHz) are observed in the upgraded Large Plasma Device [W. Gekelman, H. Pfister, Z. Lucky, J. Bamber, D. Leneman, and J. Maggs, Rev. Sci. Instrum. 62, 2875

Gyrokinetic simulations of impurity, He ash and α particle transport and consequences on ITER transport modelling

• Physics
• 2009
The transport of light and heavy impurities, as well as of energetic α particles, produced by the background electrostatic plasma turbulence is investigated by means of linear and nonlinear

Energetic ion transport by microturbulence is insignificant in tokamaks

• Physics
• 2013
Energetic ion transport due to microturbulence is investigated in magnetohydrodynamic-quiescent plasmas by way of neutral beam injection in the DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614