Joint Electron Beam Commonality Experiments on Blackjack 3 and 3 Prime. Part I. Machine Characterizations
Abstract
As part of the DNA Commonality program, material stress generation experiments were performed using the pulsed relativistic electron beam from the Maxwell Laboratories' Blackjack-3 and -3 Prime electron beam machines. Materials used were solid aluminum and tantalum, each of sufficient thickness to be opaque to the beams. The induced stress histories were monitored using X-cut quartz gauges, carbon gauges, and laser velocity interferometry. Fluence levels of up to 150 cal/sq cm were used, giving deposition of up to 750 cal/g, and the deposition time was varied from 30 to 55 ns. The electron beam characterization included measurement of fluences as a function of axial and radial positions relative to the anodes, analysis of machine performance (voltage, current) to give electron energy spectra, and establishment of mean electron angles of incidence by comparison of Monte Carlo computations with experimental dose-depth measurements. The observed stresses and electron beam parameters are to be analyzed by SRI for comparison with their wave propagation codes. The stress pulse shapes and amplitudes agree well with nominal predictions, except that a high amplitude stress tail was observed on the high dose experiments that produced Ta vapor. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1979
- Accession Number
- ADA090140
Entities
People
- Alan J. Watts
- D. A. Rice
- Donald V. Keller
- J. J. Powe