TEMPERATURE CHARACTERISTICS OF CHEMICAL EROSION OF GRAPHITE FIRST WALL
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摘要: 石墨的化学腐蚀实验是在LAS-2000二次离子质谱仪的分析室中进行的,入射高能氘离子束单独轰击或和一中和电子束联合轰击石墨以模拟等离子体辐照。石墨样品的温度从300~1000 K可调。石墨样品是从进行过氢离子辐照实验的SMF-800石墨第一壁组件上切割下来的,它在氘束轰击下释放的产物(Me-1=2~44范围内)用四极质谱探头SQ156进行原位的分子束质谱分析,得到了在1.3 μA/3keV氘束轰击下石墨样品释放氘甲烷(CD4)的温度特性,在780 K温区有一个因增强的化学腐蚀而形成的释放高峰。分析研究了氘甲烷的温度特性。Abstract: The chemical sputtering of graphite was carried out in an ultrahigh vacuum chamber of a secondary ion mass spectrometry. An incident energetic deuterium ion beam was used singly of combined with a neutralization electron beam to simulate plasma radiation. The temperature of the graphite sample was regulated from room temperature to 1 000 K.The sputtering products ranged from m/e 2～44 as a releasing molecule beam from the radiated graphite sample were analyzed in situ with a quadruple mass spectrometer SQ156. The temperature characteristic of the releasing deutero methane CD 4 from graphite SMF 800 sample bombarded by a deuterium ion beam of 1.3 μA/3keV wasobserved. The releasing peak of CD4 due to the enhanced chemical sputtering is sited in temperatures around 780 K.
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Keywords:
- Deuterium beam /
- Graphite /
- Chemical erosion /
- Temperature characteristic
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