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}
}
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… 

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References

SHOWING 1-10 OF 46 REFERENCES

Mechanisms and scalings of energetic ion transport via tokamak microturbulence

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

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

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.

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)

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)

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

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

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

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

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