Surface temperature measurement from infrared synthetic diagnostic in preparation for ITER operations

IF 3.5 1区物理与天体物理 Q1 PHYSICS, FLUIDS & PLASMAS

Nuclear Fusion Pub Date : 2024-06-30 DOI:10.1088/1741-4326/ad5a1f

M.-H. Aumeunier, A. Juven, J. Gerardin, C-M. B. Cisse, S. Pamela, R. Miorelli, C. Reboud, F. Retailleau, J. Marot, F. Rigollet and L. Marot

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引用次数: 0

Abstract

The protection of ITER in-vessel components and the plasma-wall interaction studies will be based on a large network of infrared (IR) cameras covering 70% of the tokamak. The surface temperature measurement from IR images remains challenging due to the presence of metallic targets, with changes in surface thermo-radiative properties (emissivity) and the presence of multiple reflections. The paper provides an overview of major progress to improve the interpretation of IR image and to get more reliable surface temperature from IR synthetic diagnostics. The paper presents the latest development of (1) the forward model to include the modelling of the edge localised modes and a new advanced camera that is better adapted to experimental data (2) the inverse model to retrieve the emissivity of the targets and the surface temperature from a neural network trained exclusively from synthetic IR images. Promising results have been obtained both from simulated test images with an estimated emissivity better than 0.05 and a surface temperature better than 10%, and from WEST experimental images of ITER-like wide-angle to filter reflection patterns.

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通过红外合成诊断仪测量表面温度，为热核实验堆运行做准备

热核实验堆容器内组件的保护和等离子体与壁的相互作用研究将基于覆盖 70% 托卡马克的大型红外（IR）摄像机网络。由于金属目标的存在、表面热辐射特性（发射率）的变化以及多重反射的存在，通过红外图像测量表面温度仍然具有挑战性。本文概述了在改进红外图像判读和从红外合成诊断中获得更可靠的表面温度方面取得的主要进展。论文介绍了以下方面的最新进展：(1)前向模型，包括边缘局部模式建模，以及更适合实验数据的新型先进照相机；(2)反向模型，通过完全由合成红外图像训练的神经网络检索目标的发射率和表面温度。从模拟测试图像（估计发射率优于 0.05，表面温度优于 10%）和类似于热核实验堆广角滤波反射模式的 WEST 实验图像中都获得了可喜的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Fusion 物理-物理：核物理

CiteScore

6.30

自引率

39.40%

发文量

411

审稿时长

2.6 months

期刊介绍： Nuclear Fusion publishes articles making significant advances to the field of controlled thermonuclear fusion. The journal scope includes: -the production, heating and confinement of high temperature plasmas; -the physical properties of such plasmas; -the experimental or theoretical methods of exploring or explaining them; -fusion reactor physics; -reactor concepts; and -fusion technologies. The journal has a dedicated Associate Editor for inertial confinement fusion.