期刊
PLASMA SOURCES SCIENCE & TECHNOLOGY
卷 31, 期 11, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6595/ac9b8d
关键词
sheath; presheath; electron sheath; ion electron loss balance
资金
- Chinese Academy of Science Hundred Youth Talent Program
- National Natural Science Foundation of China [11875285]
- China Postdoctoral Science Foundation [2022M713188]
- Hefei Institutes of Physical Science, Chinese Academy of Sciences [YZJJ2022QN19]
A recent theory suggests that electrons enter electron sheaths at a different speed than conventionally assumed. Experimental results show agreement with predictions based on the assumption of electrons entering at thermal velocity. If this theory is correct, it will have significant implications for the density drops in electron or ion presheaths.
A recent theory suggests that electrons enter electron sheaths at an electron Bohm velocity given by (T (e)/m (e))(1/2) instead of the electron thermal velocity as conventionally assumed. To test this theory, the flux density ratio Gamma(e,se)/Gamma(i,se) of electrons and ions entering their respective sheaths was directly measured via an almost continuous A (i)/A (e) area ratio scanning. The measured value agrees with the predictions assuming electrons entering the electron sheaths at their thermal velocity. The predictions associated with the electron Bohm criterion have not been found. If the predictions of such theories are true, the electron or ion presheath density drops will be very different from conventionally expected values.
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