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Title: Vacuum-barrier window for wide-bandwidth high-power microwave transmission

A vacuum output window comprises a planar dielectric material with identical systems of parallel ridges and valleys formed in opposite surfaces. The valleys in each surface neck together along parallel lines in the bulk of the dielectric. Liquid-coolant conduits are disposed linearly along such lines of necking and have water or even liquid nitrogen pumped through to remove heat. The dielectric material can be alumina, or its crystalline form, sapphire. The electric-field of a broadband incident megawatt millimeter-wave radio frequency energy is oriented perpendicular to the system of ridges and valleys. The ridges, about one wavelength tall and with a period of about one wavelength, focus the incident energy through in ribbons that squeeze between the liquid-coolant conduits without significant losses over very broad bands of the radio spectrum. In an alternative embodiment, the liquid-coolant conduits are encased in metal within the bulk of the dielectric. 4 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
372586
Assignee:
Univ. of California, Oakland, CA (United States) PTO; SCA: 700460; PA: EDB-96:147561; SN: 96001644978
Patent Number(s):
US 5,548,257/A/
Application Number:
PAN: 8-529,797; TRN: 96:023336
Contract Number:
W-7405-ENG-48
Resource Relation:
Other Information: PBD: 20 Aug 1996
Research Org:
University of California
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; WINDOWS; DESIGN; MICROWAVE EQUIPMENT; VACUUM SYSTEMS; COOLING SYSTEMS; HEAT TRANSFER; ALUMINIUM OXIDES; MICROWAVE POWER TRANSMISSION; ENERGY TRANSFER

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