Tritium behavior at formation of re-deposition layer from plasma facing material

从面向等离子体的材料形成再沉积层时的氚行为

• 批准号: 15360493
• 负责人: NISHIKAWA Masabumi
• 金额: $ 9.79万
• 依托单位: KYUSHU 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-15360493/
• 关键词: plasma facing material; re-deposition layer; tritium uptake; RF plasma; graphite; tungsten; co-deposition; dust formation; RF重水素プラズマ; 等方性グラファイト

In order to understand the tritium behavior at formation of re-deposition layer of plasma facing materials in a fusion reactor, experimental research has been performed using RF hydrogen plasma reactors in this study and new observations are obtained.(1)The re-deposition layer of graphite or tungsten has the porous construction and it contains rather large amount of hydrogen. The H/C ratio observed in this study is 0.1-0.3, and that of H/W is about 0.1. It is known that solubility of hydrogen in tungsten is negligibly small. Accordingly, observation in this study suggests that dusts formed in fusion reactor may contain much more tritium than expected at present.(2)The amount of hydrogen trapped in the co-deposition layer of graphite and tungsten is observed. The release behavior from co-deposition layer is different from the behavior of the re-deposition layer of single component.(3)The deuterium plasma gives several times larger re-position layer than the hydrogen plasma. This suggests that the DT plasma may give thicker re-deposition layer than the hydrogen plasma.(4).The empirical equation for the forming rate of re-deposition layer is made.

为了了解聚变堆中面向等离子体材料再沉积层形成过程中氚的行为，本研究利用射频氢等离子体反应器进行了实验研究，获得了新的观测结果。（1）石墨或钨的再沉积层具有多孔结构，并含有相当大量的氢。本研究中观察到的H/C比为0.1-0.3，H/W比约为0.1。已知氢在钨中的溶解度小得可以忽略。因此，在这项研究中的观察表明，在聚变反应堆中形成的粉尘可能含有比目前预期的更多的氚。（2）观察石墨和钨的共沉积层中捕获的氢的量。共沉积层的释放行为不同于单组分再沉积层的释放行为。（3）氘等离子体产生的再定位层比氢等离子体大几倍。这表明DT等离子体可以给出比氢等离子体更厚的再沉积层。（4）建立了再沉积层形成速率的经验公式。

项目成果

Hydrogen retention in a tungsten re-deposition layer by hydrogen RF plasma

通过氢射频等离子体在钨再沉积层中保留氢

• 发表时间: 2005
• 期刊: Fusion Science and Technology 48.1
• 作者: T.Kawasaki;Y.Manabe;K.Katayama;T.Takeishi;M.Nishikawa
• 通讯作者: M.Nishikawa

K.Katayama, M.Nishikawa, T.Takeishi: "Isotope exchange reaction between tritiated water hydrogen on SiC"Journal of Nuclear Materials. 323. 138-143 (2003)

K.Katayama、M.Nishikawa、T.Takeishi：“SiC 上氚化水氢之间的同位素交换反应”核材料杂志。

Recovery of retained tritium from graphite tiles of JT-60U

JT-60U石墨瓦中残留氚的回收

• 发表时间: 2005
• 期刊: Fusion Science and Technology 48.1
• 作者: T.Takeishi;K.Katayama;M.Nishikawa;N.Miya;K.Masaki
• 通讯作者: K.Masaki

Release behavior of hydrogen isotopes from JT-60U graphite tiles

JT-60U石墨瓦氢同位素释放行为

• 发表时间: 2005
• 期刊: Fusion Science and Technology 48(1)
• 作者: K.Katayama;T.Takeishi;Y.Manabe;H.Nagase;M.Nishikawa;N.Miya
• 通讯作者: N.Miya

Formation of graphite re-deposition layer by hydrogen RF plasma

氢射频等离子体形成石墨再沉积层

• 发表时间: 2004
• 期刊: Thin Solid Film Vol.457
• 作者: K.Katayama;H.Nagase;Y.Manabe;Y.Kodama;T.Takeishi;M.Nishikawa
• 通讯作者: M.Nishikawa