Abstract/Details

Investigation of the effects of a pulsed electrode on a magnetized plasma

Logan, Richard.  Georgia Institute of Technology. ProQuest Dissertations Publishing, 1995. 9606166.

Abstract (summary)

The electrodynamic tether is a device proposed to provide power to space vehicles in near earth orbit. The interaction of the tether with the ambient ionospheric plasma is still being investigated and is not well understood. Several models of this interaction are reviewed in this thesis. One model, the anisotropic contactor model, predicts the formation of electrostatic double layers near a current collecting plasma contactor. Detailed experiments performed at UCLA indicate the tether interaction with the ionosphere is more complicated than the anisotropic model predicts. In particular, it was found not to be possible to collect a steady state current from the laboratory plasma and no evidence of collected current levels above the electron saturation current was observed. This thesis reports results of experiments performed in a magnetized plasma with parameter ratios characteristic of the ionosphere. Current collecting probes, capacitive probes and magnetic loop probes were used to investigate the effects of a pulsed disc probe on the plasma. The results of this work indicate the pulsed electrode creates a complicated potential structure in the magnetized plasma and is also responsible for initiating a high frequency electrostatic instability in the plasma. In addition, observations of fluctuations in the current collected from the plasma support the idea that a steady state current can not be collected in the ionosphere.

Indexing (details)


Subject
Fluid dynamics;
Gases;
Geophysics;
Aerospace materials
Classification
0759: Fluid dynamics
0759: Gases
0373: Geophysics
0538: Aerospace materials
Identifier / keyword
Applied sciences; Pure sciences; Earth sciences; electrodynamic tether
Title
Investigation of the effects of a pulsed electrode on a magnetized plasma
Author
Logan, Richard
Number of pages
154
Degree date
1995
School code
0078
Source
DAI-B 56/11, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Advisor
Stacey, Weston; Hayes, Mike
University/institution
Georgia Institute of Technology
University location
United States -- Georgia
Degree
Ph.D.
Source type
Dissertation or Thesis
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9606166
ProQuest document ID
304191416
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
https://www.proquest.com/docview/304191416/abstract