A Caltech Library Service

An Investigation of the Omegatron Type Mass Spectrometer


Martel, Hardy Cross (1956) An Investigation of the Omegatron Type Mass Spectrometer. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/71EX-5M05.


An Omegatron type mass spectrometer has been investigated both theoretically and experimentally to determine its detailed operation and limitations. Resolution, peak height, shape and frequency have been calculated theoretically and compared experimentally. A method is given for sketching ion trajectories in the nonlinear case (e.g., with space charge). Using this method, it is shown that a small amount of space charge will seriously hamper the operation of the Omegatron in that it will limit the maximum excursion of a resonant ion and thus limit the possible resolution. It is shown that under normal operating conditions a trapping voltage is necessary to maintain ion collection efficiency, and that this trapping voltage causes a space charge sufficient in size to result in nonlinear ion trajectories and poor operation. It is concluded that in order to get good operation of the Omegatron some method will have to be found for eliminating the space charge or its effects. Several possibilities for doing this are suggested, the most intriguing one being to use a dipole type of RF electric field rather then a uniform one.

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):
  • Langmuir, Robert V.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1956
Record Number:CaltechETD:etd-06072004-153528
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2490
Deposited By: Imported from ETD-db
Deposited On:08 Jun 2004
Last Modified:13 Jul 2023 22:25

Thesis Files

PDF (Martel_hc_1956.pdf) - Final Version
See Usage Policy.


Repository Staff Only: item control page