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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number113462
JournalFusion Engineering and Design
Volume189
DOIs
StatePublished - Apr 2023

Funding

This work has been financially supported by the NIFS Collaboration Research Program, Japan ( NIFS13KUTR087 , NIFS22KUTR173 ). The authors are grateful for the support of QUEST team.

Keywords

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

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