Measurement and modification of first-wall surface composition in the Oak Ridge Tokamak (ORMAK)
Measurement and modification of first-wall surface composition in the Oak Ridge Tokamak (ORMAK)
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橡树岭托卡马克（ORMAK）第一壁表面成分的测量和修改
DOI：
10.1116/1.568939
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
J. Twichell
中科院分区：
文献类型：
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作者：
R. Clausing;L. C. Emerson;L. Heatherly;R. Colchin;J. Twichell
从当今环形等离子体约束装置的壁上进入等离子体的杂质实质上改变了等离子体的行为。等离子体中少量的高Z离子极大地降低了等离子体温度，增加了等离子体能量损失。我们正试图确定和控制来自ORMAK‘’第一面墙‘’的杂质来源。俄歇电子能谱、软X射线出现电位谱和其他表面敏感技术已经被用来表征第一壁的表面成分，并开发出去除碳和氧的方法。在实验室中，氧辉光放电清洗是去除金膜(模拟ORMAK衬里材料)中碳的一种有效方法，在ORMAK中使用氧气放电清洗可以减少等离子体污染，增加等离子体电流50%，并伴随着等离子体温度的升高。尽管有了这些改进，ORMAK的墙壁仍然很不干净。代替..。
Impurities coming into the plasma from the walls of present‐day toroidal plasma confinement devices modify plasma behavior substantially. Small fractions of high‐Z ions in the plasma greatly decrease plasma temperatures and increase plasma energy losses. We are attempting to identify and control the sources of impurities from the ’’first‐wall’’ in ORMAK. Auger electron spectroscopy, soft x‐ray appearance‐potential spectroscopy, and other surface‐sensitive techniques have been used to characterize the surface composition of the first wall and to develop methods to remove carbon and oxygen. Oxygen glow‐discharge cleaning has been shown, in the laboratory, to be an effective way of removing carbon from gold films (simulated ORMAK liner material) and the use of oxygen‐discharge cleaning in ORMAK has resulted in a decrease in plasma contamination, a 50% increase in plasma current, and an accompanying increase in plasma temperature. In spite of these improvements the walls of ORMAK are far from clean. Substanti...
DOI：
--
发表时间：
2008
期刊：
Ohmu-sba. 2nd Edition
影响因子：
--
作者：
S. Shimomura;R. Kimpara
通讯作者：
R. Kimpara