Investigation on modification of plasma facing surface under long duration discharges by means of a collector probe in TRIAM-1M

Takeshi Hirai; Kazutoshi Tokunaga; Tadashi Fujiwara; Naoaki Yoshida; Satoshi Itoh

doi:10.1016/S0022-3115(98)00278-5

Investigation on modification of plasma facing surface under long duration discharges by means of a collector probe in TRIAM-1M

Takeshi Hirai, Kazutoshi Tokunaga, Tadashi Fujiwara, Naoaki Yoshida, Satoshi Itoh

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

Metallic specimens mounted on a collector probe head were inserted in the scrape-off layer and exposed to long pulse tokamak plasma in TRIAM-1M. Strong radiation damage (formation of interstitial loops) was caused by high energy (>2 keV) charge-exchange hydrogen neutrals. The surfaces of the probe specimens were covered by new material made of co-deposited in-vessel elements such as Fe, Cr, Mo, O and C. The deposited layer was often exfoliated by blistering. These results indicate that energetic hydrogen neutrals and the co-deposition of impurities considerably change the surface properties of plasma facing components and even introduce new impurity sources.

Original language	English
Pages (from-to)	1060-1065
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	258-263
Issue number	PART 1 A
DOIs	https://doi.org/10.1016/S0022-3115(98)00278-5
Publication status	Published - Oct 1998

All Science Journal Classification (ASJC) codes

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

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10.1016/S0022-3115(98)00278-5

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abstract = "Metallic specimens mounted on a collector probe head were inserted in the scrape-off layer and exposed to long pulse tokamak plasma in TRIAM-1M. Strong radiation damage (formation of interstitial loops) was caused by high energy (>2 keV) charge-exchange hydrogen neutrals. The surfaces of the probe specimens were covered by new material made of co-deposited in-vessel elements such as Fe, Cr, Mo, O and C. The deposited layer was often exfoliated by blistering. These results indicate that energetic hydrogen neutrals and the co-deposition of impurities considerably change the surface properties of plasma facing components and even introduce new impurity sources.",

author = "Takeshi Hirai and Kazutoshi Tokunaga and Tadashi Fujiwara and Naoaki Yoshida and Satoshi Itoh",

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T1 - Investigation on modification of plasma facing surface under long duration discharges by means of a collector probe in TRIAM-1M

AU - Hirai, Takeshi

AU - Tokunaga, Kazutoshi

AU - Fujiwara, Tadashi

AU - Yoshida, Naoaki

AU - Itoh, Satoshi

PY - 1998/10

Y1 - 1998/10

N2 - Metallic specimens mounted on a collector probe head were inserted in the scrape-off layer and exposed to long pulse tokamak plasma in TRIAM-1M. Strong radiation damage (formation of interstitial loops) was caused by high energy (>2 keV) charge-exchange hydrogen neutrals. The surfaces of the probe specimens were covered by new material made of co-deposited in-vessel elements such as Fe, Cr, Mo, O and C. The deposited layer was often exfoliated by blistering. These results indicate that energetic hydrogen neutrals and the co-deposition of impurities considerably change the surface properties of plasma facing components and even introduce new impurity sources.

AB - Metallic specimens mounted on a collector probe head were inserted in the scrape-off layer and exposed to long pulse tokamak plasma in TRIAM-1M. Strong radiation damage (formation of interstitial loops) was caused by high energy (>2 keV) charge-exchange hydrogen neutrals. The surfaces of the probe specimens were covered by new material made of co-deposited in-vessel elements such as Fe, Cr, Mo, O and C. The deposited layer was often exfoliated by blistering. These results indicate that energetic hydrogen neutrals and the co-deposition of impurities considerably change the surface properties of plasma facing components and even introduce new impurity sources.

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Investigation on modification of plasma facing surface under long duration discharges by means of a collector probe in TRIAM-1M

Abstract

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