Final Report for Award DE-FG02-99ER54554 Kinetics of Electron Fluxes in Low-Pressure Nonthermal Plasmas Page: 1 of 6
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Final Report for Award DE-FG02-99ER54554
Kinetics of Electron Fluxes in Low-Pressure Nonthermal Plasmas.
Report period: 8/15/1999 - 8/14/2004
Uwe Kortshagen, Ph.D., Professor of Mechanical Engineering and Physics, University of Minne-
sota, 111 Church Street S.E., Minneapolis, MN 55455
Dr. Vitaly Schweigert was an expert on computational plasma physics. He was concerned with the
modeling activities under this grant. Unfortunately, after being employed 4 weeks on the grant, Dr.
Schweigert was diagnosed with a brain tumor and died 6 months after that.
Dr. Konstantin Orlov is an expert on radiofrequency discharges and worked on experimental prob-
lems under this project from Oct. 2001-Oct. 2002.
Graduate Research Assistants:
Mike Hebert worked on time-resolved probe measurements of electron fluxes in afterglow plasmas.
He received his M.S. degree in Nov. 2004.
Antonio Maresca worked on probe measurements of electron fluxes.
He received his M.S. degree in Sep. 2001.
Chengbin He worked on Monte Carlo modeling of the positive column problem.
He left for a job at Microsoft before finishing his M.S. degree.
This grant has focused on the study of several aspects of electron kinetics in low pressure plasmas.
Entirely new effects arise from the fact that the electron kinetics is governed by non-local effects,
in which the electron distribution function is not equilibrium with the local electric field but is gov-
erned by spatial transport effects. In this grant, we were able to demonstrate several previously un-
studied effects which are a direct result of the nonlocal transport. These are:
1) The existence of a "convective cell" in electron phase space. The phenomenon was ob-
served and studied in CW plasma conditions.
2) The occurrence of non-collisional cooling of electrons through an effect known as "diffu-
1) Observation of the "convective cell" in experiments
Based on the results of the convection cell in coordinate-energy space found in the positive column
simulations [Kortshagen & Lawler, J. Phys. D: Appl. Phys. 32, 2737 (1999).], we performed exten-
sive two-dimensionally resolved Langmuir probe measurements of the electron distribution func-
tion (EDF) in an inductively coupled plasma (ICP) in order to verify the existence of such a con-
vection cell [J1]. Measurements were performed in Argon for various aspect ratios of the discharge,
various RF powers, and different coil configurations. Measurements at constant total energy are
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Kortshagen, Uwe. Final Report for Award DE-FG02-99ER54554 Kinetics of Electron Fluxes in Low-Pressure Nonthermal Plasmas, report, December 13, 2004; United States. (digital.library.unt.edu/ark:/67531/metadc778896/m1/1/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.