Accession Number:

ADA261362

Title:

Dynamic Behavior of Helix Interaction Circuits

Descriptive Note:

In-house rept. Oct 1990-May 1992

Corporate Author:

ROME LAB ROME NY

Personal Author(s):

Report Date:

1992-12-01

Pagination or Media Count:

38.0

Abstract:

The dynamic behavior of a high power traveling wave tubes TWT helix interaction circuit was determined while operating in its system environment. The purpose of this effort was to develop a fundamental knowledge base of material interactions under thermal loading, develop an understanding of long-term thermal effects on materials and to develop a relationship to TWT performance and reliability. The interaction circuit for the TWT analyzed consists of a variable pitch tungsten helix, three beryllia support rods spaced at equal 120 degree intervals around the helix, and a stainless steel barrel which encloses the vacuum envelope. A three-dimensional finite element model was constructed that represented the entire interaction circuit 89 belix turns in length. There was a great deal of complexity associated with the development of this model due to the irregular T-shaped cross-section of the support rods and variation in pitch of the helix. Upon completion, the model contained approximately 18,000 elements and 45,000 nodes.

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE