Recovery of parameters of fast nonlocal heat transport in magnetic fusion plasmas: testing a model of waves with high internal reflections

TL;DR

This paper investigates a new model for fast nonlocal heat transport in magnetic fusion plasmas, emphasizing high internal wave reflections and nanostructure transport, with preliminary analysis of experimental data from tokamaks and stellarators.

Contribution

It introduces a novel model assuming high internal reflections and nanostructure-based wave transport, tested against experimental data from multiple fusion devices.

Findings

High internal reflections are compatible with experimental data.

The 'wild cable' model explains fast nonlocal heat transport.

Preliminary analysis shows promising agreement with tokamak and stellarator data.

Abstract

Our analysis of the model [J. Phys.: Conf. Ser. 941 (2017) 012008] elaborated for interpreting the initial stage of the fast nonlocal transport events, which exhibit immediate response, in the heat diffusion time scale, of the spatial profile of electron temperature to its local perturbation, shows that the nonlocal transport by electromagnetic (EM) waves needs too high reflectivity of vacuum vessel walls to describe the experimental data. Here we try another model, which assumes high internal reflections and is compatible with the "wild cable" transport of TEM waves along magnetically-bound skeletal nanostructures. An inverse problem for recovery of the source and sink of waves, and internal reflectivity, is formulated and solved. Preliminary results of analyzing the data from tokamaks JET and TFTR, and stellarator LHD are presented.