High thermal efficiency dispenser-cathode and method of manufacture therefor
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United States of America Patent
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Jun 8, 1993
Issued Date -
N/A
app pub date -
Aug 8, 1991
filing date -
Sep 6, 1990
priority date (Note) -
Expired
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Abstract
A reservoir dispenser cathode structure having improved thermal efficiency is provided by inner and outer subassemblies. The inner subassembly has a molybdenum heater cup to which a tungsten-rhenium alloy cap is laser seam-welded. The outer subassembly has a tantalum support cylinder within which the inner subassembly is supported by means of a three-point suspension in the form of tabs that are lanced from the tantalum cylinder and spot-welded to the heater cup. The heater has a coiled-coil design wherein the coils are coated with Al.sub.3 O.sub.3 and small particle tungsten powder to increase the coil's thermal emissivity. This thermally-efficient structure permits the achievement of high current density (greater than 3 Amperes per square centimeter) with heater power that is less than 1.3 Watts.
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