Hydrogen absorption capability of a niobium panel for pumping neutral atoms in divertor region

Y. Nakamura; A. I. Livshits; Y. Nakahara; Y. Hatano; A. Busnyuk; N. Ohyabu

doi:10.1016/j.jnucmat.2004.10.012

Hydrogen absorption capability of a niobium panel for pumping neutral atoms in divertor region

Y. Nakamura^*, A. I. Livshits, Y. Nakahara, Y. Hatano, A. Busnyuk, N. Ohyabu

^*この論文の責任著者

研究推進機構水素同位体科学研究センター

研究成果: ジャーナルへの寄稿 › 学術論文 › 査読

11 被引用数 (Scopus)

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The capability of a niobium panel to absorb atomic hydrogen was investigated for particle control application in divertors. The absorption rate (1.3 × 10²⁰ H/m² s) stayed almost constant up to a dose of 4 × 10²³ H/m² with no hydride formation occurring. The absorption panel can be easily regenerated. The absorbed hydrogen can be retained in the panel even after 48 h at room temperature. The absorption rate was found to decrease with panel temperature for T < 200 °C, remarkably dropping in the vicinity of room temperature. This is connected most probably with the formation of a multilayer impurity coverage. The multilayer carbon coverage deposited during the panel exposure in the divertor region of LHD decreased the absorption rate, but the panel properties could be completely restored by heating at 850 °C in spite of panel carbidization.

本文言語	英語
ページ（範囲）	461-465
ページ数	5
ジャーナル	Journal of Nuclear Materials
巻	337-339
号	1-3 SPEC. ISS.
DOI	https://doi.org/10.1016/j.jnucmat.2004.10.012
出版ステータス	出版済み - 2005/03/01

ASJC Scopus 主題領域

核物理学および高エネルギー物理学
材料科学一般
原子力エネルギーおよび原子力工学

文献へのアクセス

10.1016/j.jnucmat.2004.10.012

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@article{83c23e7f30cb43238dd3a94b46fb81fc,

title = "Hydrogen absorption capability of a niobium panel for pumping neutral atoms in divertor region",

abstract = "The capability of a niobium panel to absorb atomic hydrogen was investigated for particle control application in divertors. The absorption rate (1.3 × 1020 H/m2 s) stayed almost constant up to a dose of 4 × 1023 H/m2 with no hydride formation occurring. The absorption panel can be easily regenerated. The absorbed hydrogen can be retained in the panel even after 48 h at room temperature. The absorption rate was found to decrease with panel temperature for T < 200 °C, remarkably dropping in the vicinity of room temperature. This is connected most probably with the formation of a multilayer impurity coverage. The multilayer carbon coverage deposited during the panel exposure in the divertor region of LHD decreased the absorption rate, but the panel properties could be completely restored by heating at 850 °C in spite of panel carbidization.",

keywords = "Hydrogen inventory, Niobium, Oxygen, Particle control, Permeation",

author = "Y. Nakamura and Livshits, {A. I.} and Y. Nakahara and Y. Hatano and A. Busnyuk and N. Ohyabu",

note = "Funding Information: This work was carried out under the Collaborating Research Program between National Institute for Fusion Science and Bonch-Bruyevich University in Russian Federation and supported by the Grand-in-Aid for Scientific Research from MEXT of the Japanese government and the NIFS LHD Project Research Collaboration. The authors express their sincere thanks to Dr K. Fujii of Institute of Nuclear Safety Systems for his help in Auger analysis.",

year = "2005",

month = mar,

day = "1",

doi = "10.1016/j.jnucmat.2004.10.012",

language = "英語",

volume = "337-339",

pages = "461--465",

journal = "Journal of Nuclear Materials",

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T1 - Hydrogen absorption capability of a niobium panel for pumping neutral atoms in divertor region

AU - Nakamura, Y.

AU - Livshits, A. I.

AU - Nakahara, Y.

AU - Hatano, Y.

AU - Busnyuk, A.

AU - Ohyabu, N.

N1 - Funding Information: This work was carried out under the Collaborating Research Program between National Institute for Fusion Science and Bonch-Bruyevich University in Russian Federation and supported by the Grand-in-Aid for Scientific Research from MEXT of the Japanese government and the NIFS LHD Project Research Collaboration. The authors express their sincere thanks to Dr K. Fujii of Institute of Nuclear Safety Systems for his help in Auger analysis.

PY - 2005/3/1

Y1 - 2005/3/1

N2 - The capability of a niobium panel to absorb atomic hydrogen was investigated for particle control application in divertors. The absorption rate (1.3 × 1020 H/m2 s) stayed almost constant up to a dose of 4 × 1023 H/m2 with no hydride formation occurring. The absorption panel can be easily regenerated. The absorbed hydrogen can be retained in the panel even after 48 h at room temperature. The absorption rate was found to decrease with panel temperature for T < 200 °C, remarkably dropping in the vicinity of room temperature. This is connected most probably with the formation of a multilayer impurity coverage. The multilayer carbon coverage deposited during the panel exposure in the divertor region of LHD decreased the absorption rate, but the panel properties could be completely restored by heating at 850 °C in spite of panel carbidization.

AB - The capability of a niobium panel to absorb atomic hydrogen was investigated for particle control application in divertors. The absorption rate (1.3 × 1020 H/m2 s) stayed almost constant up to a dose of 4 × 1023 H/m2 with no hydride formation occurring. The absorption panel can be easily regenerated. The absorbed hydrogen can be retained in the panel even after 48 h at room temperature. The absorption rate was found to decrease with panel temperature for T < 200 °C, remarkably dropping in the vicinity of room temperature. This is connected most probably with the formation of a multilayer impurity coverage. The multilayer carbon coverage deposited during the panel exposure in the divertor region of LHD decreased the absorption rate, but the panel properties could be completely restored by heating at 850 °C in spite of panel carbidization.

KW - Hydrogen inventory

KW - Niobium

KW - Oxygen

KW - Particle control

KW - Permeation

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U2 - 10.1016/j.jnucmat.2004.10.012

DO - 10.1016/j.jnucmat.2004.10.012

M3 - 学術論文

AN - SCOPUS:13844310104

SN - 0022-3115

VL - 337-339

SP - 461

EP - 465

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3 SPEC. ISS.

ER -

Hydrogen absorption capability of a niobium panel for pumping neutral atoms in divertor region

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