Atomic and Ionic Hydrogen Flux Probe for Quantitative In-Situ Monitoring of Hydrogen Recycling

A. Kuzmin, K. Miura,M. Kobayashi,K. Hanada,K. Fujii,T. Shikama,M. Hasuo,H. Zushi

Fusion Engineering and Design（2023）SCI 3区

Kyoto Univ | Natl Inst Fus Sci | Kyushu Univ

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Abstract

A new combination diagnostic as a hydrogen recycling monitor in harsh conditions is proposed. Combining permeation membrane probe with a Langmuir probe provides a possibility to measure both atomic and ionic hydrogen fluxes to plasma facing components. A brief overview of permeation probes is given. The range of measurable H fluxes is from 1016 to more than 1020 Hm−2s−1. Time response of the permeation probe is ∼0.1−0.5 s. A method to address disadvantages of permeation probes is proposed. This includes an introduction of a preparation chamber for Ar-plasma cleaning of the membrane and absolute calibration with a visible spectroscopy. The hydrogen recombination coefficient, evaluated in such calibration, is ku=5.9×10−30m4s−1, which agrees well with previous research.

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Key words

Hydrogen,Atomic hydrogen,Steady state tokamak operation,PdCu,Permeation

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