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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Two Successive Thermal Inverse Problems Solved for Plasma Facing Components Inside JET Tokamak: Estimation of Surface Heat Flux and Thermal Resistance of a Surface Carbon Layer

Jonathan Gaspar
CEA - Commissariat à l'énergie atomique et aux énergies alternatives, Laboratoire IUSTI

Fabrice Rigollet
Aix Marseille Univ, CNRS, IUSTI

Jean-Laurent Gardarein
Aix-Marseille University, IUSTI UMR 7343 CNRS

Christophe Le Niliot
Aix-Marseille Université,IUSTI UMR 7343 CNRS

Yann Corre
CEA, IRFM

DOI: 10.1615/IHTC15.pls.009415
pages 6491-6504


KEY WORDS: Inverse problems, Thermophysical properties, Conjugate Gradient Method, heat flux estimation

Abstract

We present here, for the divertor tiles of the JET Tokamak, the successive heat flux estimation and characterization of space and time varying thermophysical properties of a surface carbon layer for the pulse #58850. The estimations are done in in-situ conditions with the exact geometry of the tile and in non-linear unsteady conditions using the Conjugate Gradient Method and the adjoint state. The estimation of the surface heat flux is done with one thermocouple measurement, the second one thermocouple is used for heat flux validation. The estimation of the surface carbon layer thermal resistance is done with the infrared measurement. For the two estimations the Monte Carlo error propagation method is used to calculate the confidence interval associated to the estimated values.

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