Global scaling of the heat transport in fusion plasmas
Journal article, 2020

A global heat flux model based on a fractional derivative of plasma pressure is proposed for the heat transport
in fusion plasmas. The degree of the fractional derivative of the heat flux, α, is defined through the power balance
analysis of the steady state. The model was used to obtain the experimental values of α for a large database of
the Joint European Torus (JET) carbon-wall as well as ITER like-wall plasmas. The fractional degrees of the
electron heat flux are found to be α < 2, for all the selected pulses in the database, suggesting a deviation from
the diffusive paradigm. Moreover, the results show that as the volume integrated input power is increased, the
fractional degree of the electron heat flux converges to α ∼ 0.8, indicating a global scaling between the net
heating and the pressure profile in the high-power JET plasmas. The model is expected to provide insight into
the proper kinetic description for the fusion plasmas and improve the accuracy of the heat transport predictions.

plasma transport

Magnetic confinement fusion

stochastic transport

fractional diffusion

Author

S. Moradi

Johan Anderson

Chalmers, Space, Earth and Environment

M Romanelli

Hyun-Tae Kim

Phys. Rev. Research

2643-1564 (ISSN)

Vol. 1 2 013027

Subject Categories

Energy Engineering

Meteorology and Atmospheric Sciences

Fusion, Plasma and Space Physics

Areas of Advance

Energy

Roots

Basic sciences

DOI

10.1103/PhysRevResearch.2.013027

More information

Created

1/9/2020 8