Hydrogen flux measurements with permeation probes in spherical tokamak QUEST

A. Kuzmin, H. Zushi, I. Takagi, S. K. Sharma, Y. Hirooka, M. Kobayashi, M. Sakamoto, K. Hanada, T. Onchi, Y. Oyama, N. Youshida, K. Nakamura, A. Fujisawa, H. Idei, Y. Nagashima, M. Hasegawa, K. Mishra

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Poloidal and radial distributions of the hydrogen flux, both atomic and ion, to the plasma facing materials (PFMs) are measured with four fixed and one movable PdCu membrane probes in the QUEST spherical tokamak. Direct information about hydrogen retention in the areas far from main plasma-wall interaction is essential because the significant part of the global retention is due to atomic hydrogen. Incident hydrogen flux Γinc is numerically reconstructed by fitting the experimentally measured hydrogen flux Γp, permeated through the membrane. The sensitivity of the probe is improved when compared with other work which allows dynamic changes of the retention flux to be monitored, allowing detection of 10% of the Γinc modulation, or ∼1017 H m−2s−1.

Original languageEnglish
Pages (from-to)178-182
Number of pages5
JournalVacuum
Volume129
DOIs
Publication statusPublished - Jul 1 2016

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

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