LONG-LIFE COLD CATHODE STUDIES FOR CROSSED-FIELD TUBES
Abstract
Further tests of the effects of high current density electron bombardment (0.75/sq cm) and of residual oxygen (approximately 0.000005 Torr) on the secondary-emission ratio (delta) were performed in the Electron Bombardment Vehicle (EBV) for the following samples: (1) Three samples of 9500A evaporated aluminum on copper; (2) Two samples of 300A Al2O3 on Al, anodically oxidized in tartaric acid. Generally, delta sub max varied from approximately 3.0 to 1.5. All samples showed good recovery due to O2 and consistent degradation of delta due to electron bombardment. Test of the QkS1397 CFA vehicle for more than 50 hours has demonstrated stabilized cathode emission from an aluminum cold cathode through the use of oxygen in the pressure range of 0.000001 to 0.00001 Torr. The stabilized emission level reached was approximately 4 A/sq cm at a duty cycle of 0.001.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1968
- Accession Number
- AD0832322
Entities
People
- C. Mcgeoch
- L. Lesensky
- M. Arnum
Organizations
- RTX