期刊
PHYSICS OF PLASMAS
卷 18, 期 7, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.3601354
关键词
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资金
- US Department of Energy [DE-AC02-09CH11466, DE-FG02-97ER54437]
- DOE Office of Fusion Energy Science [DE-SC0001939]
- Fusion Energy Sciences Fellowship
- U.S. Department of Energy
- Oak Ridge Associated Universities
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0903783] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-FG02-97ER54437] Funding Source: U.S. Department of Energy (DOE)
The major emissive probe techniques are compared to better understand the floating potential of an electron emitting surface in a plasma. An overview of the separation point technique, floating point technique, and inflection point in the limit of zero emission technique is given, addressing how each method works as well as the theoretical basis and limitations of each. It is shown that while the floating point method is the most popular, it is expected to yield a value similar to 1.5T(e)/e below the plasma potential due to a virtual cathode forming around the probe. The theoretical predictions were checked with experiments performed in a 2 kW annular Hall thruster plasma (n(e) similar to 10(9)-10(10) cm(-3) and T-e similar to 10-50 eV). The authors find that the floating point method gives a value around 2T(e)/e below the inflection point method, which is shown to be a more accurate emissive probe technique than other techniques used in this work for measurements of the plasma potential. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3601354]
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