Mass-spectrometric analysis during evacuation of H2O, CH4 and D2 in CRYOPUMP

Satoshi Fukada, Makoto Ueda, Kazutaka Izumi

Research output: Contribution to journalArticle

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Abstract

Multi-component adsorption isotherm is determined experimentally when He, H2 (or D2) and CH4 are adsorbed on activated carbon (AC) plated on a cryopanel cooled at cryogenic temperature and desorbed at room one. It is correlated to the Langmuir-Freundlich-type one. The equilibrium isotherms for their respective single-component adsorption processes are correlated in terms of the Langmuir-Freundlich-type ones, and the isotherm when the three components of He, H2 and CH4 are adsorbed at the same time is correlated in terms of a naturally-extended multi-component one without any changes in the original constants included in the single-component one. Rates of the isotopic exchange reaction of D atom between CH4 and D2 on AC between 10 K and room temperature are also determined. After eliminating the effects of natural isotope of 13C included in CH3D, CH2D2, CHD3, CD4 on mass-spectrometric measurements, it was found that the isotopic exchange rate of CH4 + D2= CH 3D +HD and so on was found to be so late that any detectable effect was not observed.

Original languageEnglish
Pages (from-to)538-542
Number of pages5
JournalFusion Science and Technology
Volume64
Issue number3
DOIs
Publication statusPublished - Jan 1 2013

Fingerprint

Activated carbon
Isotherms
Adsorption isotherms
isotherms
Isotopes
Cryogenics
activated carbon
Ion exchange
Adsorption
Atoms
Temperature
adsorption
cryogenic temperature
rooms
isotopes
methylidyne
room temperature
atoms
temperature

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Mass-spectrometric analysis during evacuation of H2O, CH4 and D2 in CRYOPUMP. / Fukada, Satoshi; Ueda, Makoto; Izumi, Kazutaka.

In: Fusion Science and Technology, Vol. 64, No. 3, 01.01.2013, p. 538-542.

Research output: Contribution to journalArticle

Fukada, Satoshi ; Ueda, Makoto ; Izumi, Kazutaka. / Mass-spectrometric analysis during evacuation of H2O, CH4 and D2 in CRYOPUMP. In: Fusion Science and Technology. 2013 ; Vol. 64, No. 3. pp. 538-542.
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