Accession Number:

AD0408798

Title:

DEVELOPMENT OF A VERY LOW NOISE TRAVELING-WAVE TUBE

Descriptive Note:

Scientific rept. no. 2, 15 Mar-1 Nov 1960

Corporate Author:

RADIO CORP OF AMERICA HARRISON NJ

Personal Author(s):

Report Date:

1960-11-01

Pagination or Media Count:

19.0

Abstract:

The tube met all of the objective specifications except that for a 2- db maximum tube noise figure. Noise figures as low as 2.6 db were measured on tubes fabricated during this program. The studies on low-noise techniques indicated that two basic mechanisms, operating either separately on in combination, were responsible for the low noise figures obtained. First, beam- cooling effects, based on crossed electric and magnetic fields, decreased tube noise by reducing the axial velocity fluctuations or by converting these fluctuations into a form that would not interact with the signal on the helix. Second, tube noise was reduced by the action of a dense space charge, which tends to dampen or filter space charge waves in a slowly moving stream of electrons. The major design effort consisted of modifying the basic design of the electron gun structure in order to incorporate newly developed noise-reduction mechanisms in the electron gun design.

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE