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Properties of electron swarms in gases in the upstream region of an electron source

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Title: Properties of electron swarms in gases in the upstream region of an electron source
Authors: Sugawara, H. Browse this author →KAKEN DB
Sakai, Y. Browse this author
Tagashira, H. Browse this author
Issue Date: 14-Jan-1995
Publisher: Institute of Physics
Journal Title: Journal of Physics D: Applied Physics
Volume: 28
Issue: 1
Start Page: 61
End Page: 67
Publisher DOI: 10.1088/0022-3727/28/1/011
Abstract: Exponential spatial growth of electron swarms in gases under steady-state Townsend conditions may be observed not only in the downstream region of an electron source but also in the upstream region due to backward diffusion. Relations among swarm parameters in the upstream region were deduced and found to have peculiar characteristics. For example, the sign of the average electron velocity vd for steadystate Townsend conditions depends on whether the gas is electro-positive or electronegative. This property is confirmed quantitatively by calculating the electron energy distribution using a propagator method modified for analysis in the upstream region. As an example of the effect of backward diffusion, the decay in the electron number density in front of the anode in a steady-state Townsend experiment between parallel plane electrodes was studied. The decay is caused by the missing electrons absorbed at the anode. The energy distribution of the missing electrons has a non-equilibrium relaxation region and the equilibrium region lies towards the cathode direction. The number density of the missing electrons showed an exponential spatial dependence in the equilibrium region. The relative gradient of the decrease agreed well with the relative density gradient α obtained in the upstream region. It was also found that the electron energy distribution in the decaying region tends to that in the upstream equilibrium region.
Rights: Copyright © 1995 Institute of Physics
Relation: http://www.iop.org/EJ/journal/JPhysD
Type: article (author version)
URI: http://hdl.handle.net/2115/13710
Appears in Collections:情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 菅原 広剛

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