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Accession Number:
AD0275265
Title:
PULSE HEATING OF MATERIALS BY HIGHLY CONCENTRATED ELECTRON BEAMS.
Corporate Author:
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
Report Date:
1962-01-01
Abstract:
An existing high perveance electron gun with a high area convergence ratio was adapted for the experiments. A cathode diam. of 0.6 cm or an area of 0.5 sq. cm was chosen. This resulted in a specific cathode load of 5 amperessq cm at 10,000 volts. Such a current was drawn from a pure Ta surface heated to 2600 K by electron bombardment. The electron energy was uniformly absorbed in a layer of material with a thickness corresponding to 2.6 x 10 to the -4th power gsq cm. At the beginning of the pulse, the exposed area of this layer corresponded to the vacuum electron beam cross-section, but was reduced very rapidly by additional ion focusing caused by material evaporation. Experiments were performed using a condensor discharged through the gun for bombarding solid Ta as well as thin Ta foils. Craters and surface explosions on the targets were observed. Thin foils were punctured by the beam producing a liquid film. A jet of evaporating Ta then accelerated, by its recoil force, the film in the direction of the beam. The film was torn apart forming a series of small droplets. Author
Descriptive Note:
Final rept.,
Pages:
0052
Contract Number:
AF19(604)-8810
File Size:
0.00MB
