Modification of Tungsten Surface Irradiated by Hydrogen and Helium Plasma

氢氦等离子体辐照钨表面改性

• 批准号: 13680567
• 负责人: OHNO Noriyasu
• 金额: $ 2.3万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13680567/
• 关键词: Fusion; Plasma; Divertor; High Z Metal; Tungsten; Irradiation Damage; Hydrogen; Helium; バブル; 損耗; ブリスター; プラズマ対向材

(Hydrogen Plasma Irradiation)Blister formation is clearly observed on tungsten surface under a low energy (<100 eV) and high flux(>l0^<21> m^<-2> s^<-1>) hydrogen plasma irradiation at the surface temperature less than 950 K and the fluence higher than 3 x 10^<24> m^<-2>. The size of maximum hydrogen blisters is up to 300micron at higher fluence irradiation. The dependence of blister formation on sample temperature is clearly obtained. When the surface temperature is higher than 950 K no blisters are observed on tungsten surface at various incident fluence. These results indicate that such large hydrogen blister formation due to low energy particles irradiation at low temperature can also make a great effect on the hydrogen retention in fusion devices and reactors.(Helium Plasma Irradiation)Tungsten (W) specimens were irradiated by low energy (<65 eV) and high flux (>10^<23> m^<-2> s^<-1>) helium plasma to investigate the incident ion energy dependence of helium bubble formation. Experimental results indicate the existence of the incident ion energy threshold for the bubble formation. The threshold energy around 15 eV could associate with the surface potential for He ions entering to the W surface.

（氢等离子体辐照）在低能（<100 eV）和高通量（> l0^<21> m^<-2> s^<-1>）在表面温度下的氢等离子体照射下，在钨表面上清楚地观察到了泡沫的形成。在较高的通风辐射下，最大氢水泡的大小最高为300米。清楚地获得了水泡形成对样品温度的依赖性。当表面温度高于950 K时，在各种入射通量处的钨表面上观察到没有水泡。 These results indicate that such large hydrogen blister formation due to low energy particles irradiation at low temperature can also make a great effect on the hydrogen retention in fusion devices and reactors.(Helium Plasma Irradiation)Tungsten (W) specimens were irradiated by low energy (<65 eV) and high flux (>10^<23> m^<-2> s^<-1>) helium plasma to investigate the incident ion energy dependence of氦气泡形成。实验结果表明，气泡形成的入射离子能阈值存在。 15 eV的阈值能量可能与进入W表面的He离子的表面电势相关联。

项目成果

M.Y.Ye, H.Kanehara, S.Fukuta, N.Ohno, S.Takamura: "Blister formation on tungsten surface under low energy and big flux hydrogen plasma irradiation in NAGDIS-I"Journal of Nuclear Materials. Vol.313-316. 72-76 (2003)

M.Y.Ye、H.Kanehara、S.Fukuta、N.Ohno、S.Takamura：“NAGDIS-I 低能量大通量氢等离子体辐照下钨表面气泡形成”核材料杂志。

Y.Hagino, N.Ohno, S.Takamura, M.Y.Ye: "Experimental evaluation of apace charge limited emission current from tungsten surface in high density helium plasma"Journal of Nuclear Materials. Vol.313-316. 670-674 (2003)

Y.Hagino、N.Ohno、S.Takamura、M.Y.Ye：“高密度氦等离子体中钨表面的空间电荷限制发射电流的实验评估”核材料杂志。

D.Nishijima, M.Y.Ye, N.Ohno and S.Takamura: "Incident ion energy dependence of bubble formation on tungsten surface with low energy and high flux helium plasma irradiation"Journal of Nuclear Materials. Vol.313-316. 97-101 (2003)

D.Nishijima、M.Y.Ye、N.Ohno 和 S.Takamura：“低能量和高通量氦等离子体辐照下钨表面气泡形成的入射离子能量依赖性”核材料杂志。

Y.Hagino, N.Ohno, S.Takamura, M.Y.Ye: "Experimental evaluation of space charge limited emission current from tungsten surface in high density helium plasma"Journal of Nuclear Materials. Vol.313-316. 670-674 (2003)

Y.Hagino、N.Ohno、S.Takamura、M.Y.Ye：“高密度氦等离子体中钨表面空间电荷限制发射电流的实验评估”核材料杂志。

M.Y.Ye, H.Kanehara, S.Fukuta, N.Ohno, S.Takamura: "Blister formation on tungsten surface under low energy and and high flux hydrogen plasma irradiation in NAGDIS-I"Journal of Nuclear Materials. Vol.313-316. 72-76 (2003)

M.Y.Ye、H.Kanehara、S.Fukuta、N.Ohno、S.Takamura：“NAGDIS-I 中低能量和高通量氢等离子体辐照下钨表面的气泡形成”核材料杂志。