Dynamic Behavior of Helix Interaction Circuits
Abstract
The dynamic behavior of a high power traveling wave tube's (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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1992
- Accession Number
- ADA261362
Entities
People
- Peter J. Rocci
Organizations
- Rome Laboratory