Construction of scientific base towards reduction of plasma power flow on fusion wall associated by ELM heat pulse

构建ELM热脉冲减少聚变壁等离子体功率流的科学基础

• 批准号: 23656578
• 负责人: TAKAMURA Shuichi
• 金额: $ 2.5万
• 依托单位: Aichi Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-23656578/
• 关键词: 核融合; プラズマ‐壁相互作用; タングステン; ヘリウム損傷; 繊維状ナノ構造; 電子放出; 過渡的熱負荷; 重水素プラズマ; プラズマ－壁相互作用

Experiments have shown power transmission factor (PTF) for nanostructured tungsten (W) is greater than that for normal W over a wide range of sheath voltage. Both a reduction in ion energy reflection coefficient due to fiber-form nanostructure and a cooling effect associated by electron emission from the surface have been considered to explain the difference in PTF, which have been also included in our new PTF theory, and a qualitative agreement between the experiments and the new theory was obtained.Concerning the electron emission from W surface, it is found that Auger effect of incident helium ions contributes to the electron emission in addition to secondary electron emission. Thermoelectron emission due to deuterium plasma heat pulse was found to give a serious influence on a further W temperature increase.Nano-loops were identified to be an initial stage precursor of fiber-form nanostructure growth of W as well as Mo surface due to helium plasma exposure.

实验表明，在很宽的鞘层电压范围内，纳米结构钨 (W) 的功率传输因数 (PTF) 大于普通钨的功率传输因数 (PTF)。纤维状纳米结构导致的离子能量反射系数的降低和表面电子发射带来的冷却效应都被认为可以解释 PTF 的差异，这也包含在我们的新 PTF 理论中，并且定性一致关于W表面的电子发射，发现除了二次电子发射之外，入射氦离子的俄歇效应也有助于电子发射。发现氘等离子体热脉冲引起的热电子发射对 W 温度进一步升高有严重影响。纳米环被认为是氦等离子体引起的 W 和 Mo 表面纤维状纳米结构生长的初始前驱体接触。

项目成果

TEM analysis of high temperature annealed W nanostructure surfaces

• DOI: 10.1016/j.jnucmat.2011.11.044
• 发表时间: 2012-02
• 期刊: Journal of Nuclear Materials
• 影响因子: 3.1
• 作者: S. Kajita;N. Yoshida;R. Yoshihara;N. Ohno;T. Yokochi;M. Tokitani;S. Takamura

ナノ繊維状構造を持つヘリウム損傷タングステンの修復

用纳米纤维结构修复氦损伤的钨

• 发表时间: 2011
• 作者: 宮本隆徳;高村秀一
• 通讯作者: 高村秀一

2電子温度プラズマ-タングステン壁におけるパワー伝達係数評価

2 电子温度等离子体-钨壁中的功率传输系数评估

• 发表时间: 2013
• 作者: T. Yanagida;Y. Fujimoto;K. Watanabe;K. Fukuda;N. Kawaguchi;Y. Miyamoto;H. Nanto;Kimikazu Sasa;高村秀一
• 通讯作者: 高村秀一

繊維状ナノ構造を持つヘリウム損傷タングステンの修復

用纤维纳米结构修复氦损伤的钨

• 发表时间: 2011
• 作者: Y. Hata;H. Purwanto;S. Hosokai;J. Hayashi;Y. Kashiwaya;T. Akiyama;宮本隆徳
• 通讯作者: 宮本隆徳

Modified Power Transmission Factor of Tungsten in Plasmas with Hot Electron Component

热电子分量等离子体中钨的功率传输系数修正

• DOI: 10.1002/ctpp.201410016
• 发表时间: 2014
• 期刊: Contributions to Plasma Physics
• 影响因子: 1.6
• 作者: S. Takamura;S. Ono and N. Ohno
• 通讯作者: S. Ono and N. Ohno