APPLIED RESEARCH ON FIELD EMISSION CATHODES.

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Abstract:

Three large needle-shaped field emission cathodes were tested in diode tubes. Shaping of these cathodes to lessen the effect of the support filaments on the terminal electric fields resulted in an increase in the average beam perveance realized during their operation to a value 47 greater than the average realized during earlier operation of otherwise similar needles. Correction of faults, which became apparent upon testing of edgeshaped single crystal tungsten field emission cathodes, led to the development of an electrochemical means for the shaping of such structures. The main advantage of this technique is to avoid cold working of the material. An emitted beam of 100 amperes at 200 kv, corresponding to a micro-perveance of 1, has thus far been realized from such an edge. A beam tester for the study of electrostatic focusing of the emission from a large, high voltage, field emission needle was evacuated and is ready for testing. The action of a suitable electrostatic field upon a magnetically constrained electron beam to reduce the transverse component of electron velocity was studied by means of the electrolytic tank analogue and Buschs theorem. Author

Author(s):
Martin, E. E. ; Charbonnier, F. M.
Author Organization(s):
FIELD EMISSION CORP MCMINNVILLE OR
Descriptive Note:
Quarterly rept. no. 3, 15 Dec 63-15 Mar 64,
Pagination:
0027

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
7
Contract/Grant Number(s):
DA36 039AMC03266E
Task Number(s):
77761101338
Project Number(s):
123 63
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
FIELD EMISSION, CONFIGURATIONS, TUNGSTEN, ELECTRONS, TEST EQUIPMENT, SPACE CHARGE, OXIDATION, ELECTRODES, CHEMICAL MILLING
Report Date:
1964 Mar 15