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Measurement of the Complex Conductivity of an Ionized Gas at Microwave Frequencies


Adler, Fred Peter (1950) Measurement of the Complex Conductivity of an Ionized Gas at Microwave Frequencies. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/705A-3B21.


The positive column of a glow discharge is placed along the axis of a cylindrical cavity excited in the TM010 mode. The transmission of 3 cm waves through the cavity and the shift in resonant frequency are observed as a function of discharge current. It is shown that from these measurements values of the complex conductivity of the electron gas can be calculated. Curves of the measured conductivity components as functions of pressure and current are given. From theoretical expressions for the conductivity values of electron density are calculated. Langmuir probe studies are carried out and adequate agreement is found. Finally, mean free path and mean free time between collisions are calculated from the conductivity values and hence the variation of collision cross-section with temperature is found.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Electrical Engineering and Physics)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Electrical Engineering
Minor Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Pickering, William Hayward (advisor)
  • Mackeown, Samuel Stuart (advisor)
Thesis Committee:
  • Pickering, William Hayward (chair)
  • Lindvall, Frederick C.
  • McCann, Gilbert Donald
  • Neher, Henry Victor
  • Ramo, Simon
  • Smythe, William Ralph
  • Sorensen, Royal Wasson
Defense Date:1 January 1950
Additional Information:Thesis file (PDF) missing pp. 39.
Funding AgencyGrant Number
General Electric Educational FundUNSPECIFIED
Record Number:CaltechTHESIS:01222018-114138209
Persistent URL:
Related URLs:
URLURL TypeDescription adapted for Appendix. adapted for Appendix.
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10644
Deposited By: Benjamin Perez
Deposited On:22 Jan 2018 20:50
Last Modified:18 Oct 2023 00:02

Thesis Files

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