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Reconstruction of Electron Temperature Profiles Using Bayesian Analysis on Electron Cyclotron Emission Diagnostics in CHD

Fumiyoshi KIN¹⁾, Tatsuya KOBAYASHI²⁾, Tokihiko TOKUZAWA²⁾, Daiki NISHIMURA²⁾, Takeo HOSHI²⁾, Makoto SASAKI³⁾, Kazunobu NAGASAKI¹⁾, Sigeru INAGAKI¹⁾

1)

Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan

2)

National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gifu 509-5292, Japan

3)

College of Industrial Technology, Nihon University, Narashino, Chiba 275-8575, Japan

(Received 31 October 2025 / Accepted 27 January 2026 / Published 15 May 2026)

Abstract

The electron cyclotron emission (ECE) diagnostics is planned to be installed in the CHD stellarator/heliotrons for electron temperature measurement. The radiation profile of ECE is simulated by raytracing code, TRAVIS. Due to the insufficient optical thickness, the radiation temperature can be deviate from the electron temperature. To reconstruct the electron temperature profile, we have developed the analysis method based on the Bayesian framework, ODAT-SE. The method examined for several scenarios, including the wall reflections and energetic electrons. We have accurately reconstructed the electron temperature profile in all scenarios if the electron density profile is priorly given.

Copyright (c) 2026 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

electron cyclotron emission, CHD, TRAVIS, Bayesian analysis

DOI: 10.1585/pfr.21.1402023

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