Heat flux deposition on plasma-facing components using a convective model with ripple and Shafranov shift

TL;DR

This paper presents a convective heat flux deposition model incorporating ripple and Shafranov shift effects, validated against experiments, and used for optimizing plasma-facing components in fusion devices.

Contribution

The paper introduces the Tokaflu code that models heat flux deposition with magnetic perturbations, enhancing design accuracy for plasma-facing components.

Findings

Tokaflu code accurately predicts heat flux on plasma-facing components.

Inclusion of ripple and Shafranov shift improves model realism.

Model validated against experimental data.

Abstract

A heat flux deposition code is a very useful tool for the design of plasma-facing components. The classical cosine model representative of the convective parallel heat flux was coded within the standard finite element code of the CEA Castem 2000. Two perturbations to the idealised magnetic surfaces were taken into account: the Shafranov shift and the ripple of the toroidal magnetic field. The calculation scheme -- named Tokaflu -- was confronted to previous computations on bottom modular limiters and to experiments on the inner first wall. The code was used to optimise the shape of future plasma-facing components in Tore Supra designed for the CIEL project, namely the toroidal pumped limiter and its neutralisers. Developments are under way to include the shadowing of the components, other power deposition schemes and possibly later plasma sections other than circular.