Speaker
Mr
Dobrynya Kolodko
(National Research Nuclear University "MEPhI")
Description
Beam-plasma discharge is used in PR-2 (fig.1) [1]. Plasma parameters can be varied in a wide range. It is important to know the longitudinal electron energy distribution. Precise definition of electron energy distribution function allows interpreting Langmuir probe characteristics in a more accurate way. In addition, it allows understanding processes in auto-oscillating regime at plasma-surface interaction. [1, 2]
![Scheme of linear plasma device PR-2][8]
The linear plasma device PR-2 has mirror ratio 1,55. Beam-plasma discharge is provided by electron beam 1 - 10 kV, power up to 10 kW. Measurements were carried out behind the magnet mirror with small-size integral electrostatic energy analyzer. The analyzer has long circular diaphragm with small radius to cut ions off. [3]
The long (2 mm) diaphragm (d = 0,5 mm) is mounted on water-cooled collector with an aperture. The ions with larmor radius more than 0,5d are cut off. Integral electrostatic energy analyzer [4] is mounted behind the diaphragm. Retarding electrode is made of wide metal plate with a small aperture. Thus distortion of an electric field is negligible. Retarding potential is up to 10 kV. Second electrode and current detector is a Faraday cup under small positive potential (~30 V). The analyzer can measure electron energy distribution up to 10 kV.
1. Gutorov, K. M., Vizgalov, I. V., Markina, E. A., & Kurnaev, V. A. Influence of thin dielectric layers on electron emission and plasma-surface contact stability. Bulletin of the Russian Academy of Sciences: Physics, 2010, 74(2), 188-191
2. Gutorov, K. M., Vizgalov, I. V., & Kurnaev, V. A. High-voltage pulse generation in the auto-oscillating discharge. Applied Physics, 2011б (6), 87-90
3. Akhmetov, T. D., Davydenko, V. I., & Taskaev, S. Y. Measurements of the electron distribution function in the AMBAL-M startup plasma by an electrostatic analyzer. Plasma Physics Reports, 2000, 26(2), 152-156
4. I. H. Hutchinson, Principles of Plasma Diagnostics, Second Edition. Cambridge University Press, 2002, 94-99
[8]: https://pp.vk.me/c626229/v626229203/793/aaErFVanjXg.jpg
Primary authors
Mr
Dobrynya Kolodko
(National Research Nuclear University "MEPhI")
Mr
Fedor Podolyako
(National Research Nuclear University "MEPhI")
Dr
Igor Vizgalov
(National Research Nuclear University "MEPhI")
Mr
Ivan Sorokin
(National Research Nuclear University "MEPhI")
Peer reviewing
Paper
Paper files:
