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)在表面温度小于950K、注量大于3×10^~(-1)的低能量(~lt；100 eV)、高通量(~(21&gt；m^&lt；-2&gt；S^&lt；-1)氢等离子体辐照下，钨表面能明显观察到气泡的形成。在较高的辐照剂量下，最大氢泡尺寸可达300微米。清晰地得到了气泡形成与样品温度的关系。当表面温度高于950K时，在不同的入射通量下，钨表面没有观察到起泡。这些结果表明，低温下低能粒子辐照形成如此大的氢泡也会对聚变装置和反应堆中的氢气保持产生很大的影响。(氦等离子体辐照)钨(W)样品被低能量(~lt；65 eV)和高通量(~gt；10^&lt；23&gt；m^&lt；-2&gt；S^&lt；-1&gt；)氦等离子体辐照，以研究入射离子能量对氦泡形成的依赖关系。实验结果表明，气泡形成存在入射离子能量阈值。15 eV附近的阈值能量可能与He离子进入W表面的表面电势有关。

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。

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。

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。