CESIUM AND THALLIUM BEAM TUBE RESEARCH.
Abstract
During this reporting period, the following work has been performed on tasks related to cesium tubes. A program to compare the relative merits of high beam intensity tubes using dipole or multipole magnets was established. The theoretical and experimental work related to dipole tubes has been essentially completed. Cesium getter test apparatus has been designed, constructed, and used to evaluate cesium getters. Results are complete for dag and gold. Twenty-two sample shields were procured for evaluation. The sensitivity of the test apparatus was improved and tests were performed. The analysis of the results is given in this report. Theoretical analysis has been carried out on a cavity of new design. The operating characteristics of the ionizer in the Tl-1 thallium beam tube are presented. The life of a ribbon ionizer against etching in an oxygen atmosphere of 10 to the minus 7th power torr by evaporation of tungsten oxide is estimated to be about a year for a 10% reduction in thickness. Tungsten buttons could be expected to last indefinitely. Limitation of life by accumulation of thallium in the A magnet gap is not a problem. Measurement of the resonance frequency of thallium in the Tl-1 thallium beam tube results in a value of 21,210,833,946.5 plus or minus .2Hz in the A-1 time scale, a value 3 parts in 10 to the 11th power greater than the most recently published result of measurements at the National Bureau of Standards. At present, no cause of systematic error can be found. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1967
- Accession Number
- AD0813059
Entities
People
- J. H. Holloway
- R. F. Lacey