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Updated: Jun 17, 2025

Optimization, Test and Diagnostics of Miniaturized Hall Thrusters
Published on: February 16, 2019
Preparatory study of feasibility for a vertical viewing electron cyclotron emission diagnostic for the JT-60SA
T Tokuzawa1,2,3, M Yoshida4, R Imazawa4
1National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan.
Abstract:
A preparatory study is underway to investigate the feasibility study of high-energetic, non-thermal electron distribution function measurements using a vertical-viewing electron cyclotron emission (ECE) diagnostic on JT-60SA. The system is designed to detect broad ECE spectra (70-260 GHz) due to the second, third, and fourth harmonics using a focusing optics system with four quasi-optical mirrors in the upper port of JT-60SA. A Gaussian beam optics design is performed in vacuum, and ray tracing calculations are performed in plasma using the TRAVIS code to investigate density characteristics. A ceramic viewing dump is also designed to reduce the effects of multiple reflections from the opposing vacuum vessel surface.
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