Study on formation mechanism of dust particles in divertor plasma simulators

偏滤器等离子体模拟器中尘粒形成机理研究

• 批准号: 15360489
• 负责人: OHNO Noriyasu
• 金额: $ 6.02万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360489/
• 关键词: Nuclear Fusion; Plasma; Dust; ITER; Carbon; Tungsten; ダイバータ; プラズマ・壁相互作用; 水素; ヘリウム; 微粒子

Formation of carbon dust particles on a graphite surface irradiated by a high-density hydrogen plasma and a mixed hydrogen/helium plasma has been investigated in the NAGDIS-II linear divertor plasma simulator. Carbon dust particles are generated at the center region of the graphite surface facing the high-density plasma. No dust particles are formed in the peripheral region. These observations indicate that the re-deposition process of the hydrocarbon ions due to a strong plasma flow at the center of the plasma column is one of the key factors determining the dust growth as well as chemical sputtering.Low-energy and high-flux plasma exposures on tungsten surfaces result in blister/hole formation. Subsequent He plasma exposure at 2,000 K on the blister-rich surface forms a hole structure on the surface, including the blister surface, and some blisters collapse due to recrystallization and bubble formation on the blister skin. Grain ejections were observed after deuterium plasma exposure at 550 K on a W surface on which a hole structure had formed due to He pre-exposure at 1,600 K.

在NAGDIS-II线性偏滤器等离子体模拟器上研究了高密度氢等离子体和混合氢/氦等离子体辐照石墨表面碳尘粒子的形成。碳尘颗粒产生在石墨表面的中心区域，面对高密度等离子体。在外围区域中没有灰尘颗粒形成。这些观察结果表明，由于等离子体柱中心的强等离子体流导致的碳氢离子的再沉积过程是决定粉尘生长以及化学溅射的关键因素之一。低能量和高通量等离子体暴露在钨表面导致气泡/孔洞的形成。随后的He等离子体暴露在2,000 K的气泡丰富的表面上形成一个孔结构的表面上，包括泡表面，和一些水泡崩溃，由于再结晶和气泡形成的水泡皮肤上。在1,600 K下He预暴露而形成空穴结构的W表面上，在550 K下氘等离子体暴露后观察到颗粒喷射。

项目成果

Suppression of blister formation and deuterium retention on tungsten surface due to mechanical polishing and helium pre-exposure

• DOI: 10.1088/0029-5515/45/7/016
• 发表时间: 2005-06
• 期刊: Nuclear Fusion
• 影响因子: 3.3
• 作者: D. Nishijima;H. Iwakiri;K. Amano;M. Ye;N. Ohno;K. Tokunaga;N. Yoshida;S. Takamura

High-Z Dust Generation on Tungsten Surface due to Synergetic Erosion of Deuterium/Helium Plasma Exposure

由于氘/氦等离子体暴露的协同侵蚀而在钨表面产生高Z灰尘

• 发表时间: 2005
• 期刊: J. Plasma Fusion Res. 81
• 作者: D.Nishijima;K.Amano;N.Ohno;N.Yoshida;S.Takamura
• 通讯作者: S.Takamura

Carbon dust formation from re-deposited layers in high-density hydrogen/helium plasmas in the NAGDIS-II device

• DOI: 10.1016/j.jnucmat.2004.10.032
• 发表时间: 2005-03
• 期刊: Journal of Nuclear Materials
• 影响因子: 3.1
• 作者: N. Ohno;Y. Kobayashi;T. Sugimoto;S. Takamura

Hydrogen Blister Formation on Cold-Worked Tungsten with Layered Structure

层状结构冷加工钨氢气泡的形成

• 发表时间: 2004
• 期刊: Japanese Journal of Applied Physics 44巻・1A号
• 作者: 西島 大;他
• 通讯作者: 他

Characteristic changes of deuterium retention on tungsten surfaces due to low-energy helium plasma pre-exposure

• DOI: 10.1016/j.jnucmat.2004.10.011
• 发表时间: 2005-03
• 期刊: Journal of Nuclear Materials
• 影响因子: 3.1
• 作者: D. Nishijima;T. Sugimoto;H. Iwakiri;M. Ye;N. Ohno;N. Yoshida;S. Takamura