Investigation of the trapped helium and hydrogen ions in plasma facing materials for LHD using thermal desorption spectrometer and alternating glow discharge cleanings

Y. Kubota, N. Noda, A. Sagara, H. Suzuki, S. Masuzaki, Kazutoshi Tokunaga, T. Satow, K. Yamazaki, O. Motojima

Research output: Contribution to journalConference article

8 Citations (Scopus)

Abstract

Preliminary experiment to evaluate, analyze, and reduce the gas accumulation of materials used in LHD as plasma facing components has been carried out using a test devices ACT and a thermal desorption spectrometer. As the test materials, stainless steel (SUS316L) and iso-graphite (IG-430U) are selected and installed inside the vacuum vessel of ACT as linings, which are near the same kinds as the first wall material and armor tile material of the divertor plate used in LHD, respectively. Each material is exposed to alternating glow discharge plasma with He and H2 gasses. Qualitative measurement using a quadruple mass filter indicates that the He gas amount released from the stainless steel wall during H2 glow discharge cleaning is several times as much as that released from the graphite wall, which is an unexpected result. This result does not contradict that of the thermal desorption spectrometer measurement for small samples exposed to He glow discharge plasma for 7 h.

Original languageEnglish
Pages (from-to)239-244
Number of pages6
JournalJournal of Nuclear Materials
Volume313-316
Issue numberSUPPL.
DOIs
Publication statusPublished - Mar 1 2003
EventPlasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan
Duration: May 26 2002May 31 2002

Fingerprint

Helium
Thermal desorption
helium ions
Glow discharges
hydrogen ions
glow discharges
cleaning
Spectrometers
Protons
Cleaning
desorption
spectrometers
Plasmas
Hydrogen
stainless steels
Ions
graphite
Graphite
fluid filters
Stainless Steel

All Science Journal Classification (ASJC) codes

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

Cite this

Investigation of the trapped helium and hydrogen ions in plasma facing materials for LHD using thermal desorption spectrometer and alternating glow discharge cleanings. / Kubota, Y.; Noda, N.; Sagara, A.; Suzuki, H.; Masuzaki, S.; Tokunaga, Kazutoshi; Satow, T.; Yamazaki, K.; Motojima, O.

In: Journal of Nuclear Materials, Vol. 313-316, No. SUPPL., 01.03.2003, p. 239-244.

Research output: Contribution to journalConference article

Kubota, Y. ; Noda, N. ; Sagara, A. ; Suzuki, H. ; Masuzaki, S. ; Tokunaga, Kazutoshi ; Satow, T. ; Yamazaki, K. ; Motojima, O. / Investigation of the trapped helium and hydrogen ions in plasma facing materials for LHD using thermal desorption spectrometer and alternating glow discharge cleanings. In: Journal of Nuclear Materials. 2003 ; Vol. 313-316, No. SUPPL. pp. 239-244.
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AU - Kubota, Y.

AU - Noda, N.

AU - Sagara, A.

AU - Suzuki, H.

AU - Masuzaki, S.

AU - Tokunaga, Kazutoshi

AU - Satow, T.

AU - Yamazaki, K.

AU - Motojima, O.

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