Study of impurities generation via thermal desorption in magnetic compression system
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摘要: 磁压缩系统为俄罗斯实验物理研究院提出的核聚变方案。磁压缩系统腔室中杂质粒子可能来源于热脱附、等离子体刮削器壁等途径。利用ANSYS工具模拟5 MA脉冲电流流过腔室,并给出电极温度的二维分布图,结合研究小尺寸铜样品上杂质的解吸附来分析磁压缩系统腔室中热脱附过程产生的杂质粒子。通过测量3 keV的Ar+离子入射到Cu(110),Cu(111)样品表面的飞行时间谱,分析样品表面吸附的杂质种类,以及样品表面杂质含量随温度的变化关系。研究表明杂质粒子含量跟电极温度有关联性,且跟电极材料表面结构相关。Abstract: The magnetic compression system (MAGO) proposed by VNIIEF is a new concept of nuclear fusion. The impurities in magnetic compression system may come from thermal desorption process, and wall materials washout by plasma. In this paper, combined with the 2-D temperature distribution of anodic electrode for 5 MA pulsed current flowing through gas pondermotor unit, the impurities generated from thermal desorption process in MAGO chamber were analyzed, consulted to the impurities desorption of copper sample. The TOF spectrum of 3 keV Ar+ scattering from Cu(110), Cu(111) surfaces were measured, and the impurity elements on copper surface were analyzed. According to the results, impurities desorption depends on the temperature and the surface structure of anodic electrode.
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Key words:
- magnetic compression system /
- nuclear fusion /
- pulsed power /
- impurity /
- time-of-flight spectrum
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