By Topic

The Effect of Grid-Support Wires on Focusing Cathode Emission

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Chai Yeh ; Radio Research Institute, National Tsing Hua University, Kunming, China

In an earlier paper, Thompson has shown experimentally that sharp electron beams can be obtained if the relative electrode potentials on the anode and the grid of a vacuum tube are properly adjusted. However, theoretical interpretation of this effect was lacking. In the present paper the effects of the grid-support wires and of the various tube dimensions on the angle of electron emission are investigated theoretically. The investigation indicates that Thompson's interpretations are in the right direction. Quantitative check with the experimental results cannot be expected, because the theoretical computations are based upon pure electrostatic considerations at the cathode surface, while in actual experiments the angle of beam current at the anode is measured. Thus, the focusing and defocusing effects of the field distribution in space and the space charge existing near the cathode will cause a wide deviation between the angle of electron emission at the cathode and that of the beam current at the anode.

Published in:

Proceedings of the IRE  (Volume:34 ,  Issue: 7 )