FEASIBILITY STUDY OF NEW HIGH CURRENT DENSITY ELECTRON EMITTERS USING PULSE LASER OF ELECTRON BEAM IRRADIATION

Award Information
Agency: Department of Defense
Branch: Army
Contract: N/A
Agency Tracking Number: 6261
Amount: $49,961.00
Phase: Phase I
Program: SBIR
Awards Year: 1987
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
603 King St, Alexandria, VA, 22314
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 DR MICHAEL E READ
 (703) 548-6410
Business Contact
Phone: () -
Research Institution
N/A
Abstract
CATHODES CAPABLE OF GENERATING CURRENTS OF 100 A TO 10,000 A WITH CURRENT DENSITIES OF 100 TO 1000 A/CM2 WITH HIGH BRIGHTNESS ARE REQUIRED FOR SUPERPOWER MICROWAVE, MM-WAVE AND OPTICAL COHERENT RADIATION SOURCES, SUCH AS FREE ELECTRON LASERS. OF PRESENTLY AVAILABLE CATHODES, ONLY FIELD EMISSION TYPE CATHODES CAN PRODUCE THE REQUIRED CURRENT DENSITIES. THESE ARE NOT SUITABLE FOR LONG PULSE OF HIGH DUTY CYCLE OPERATION, WHICH IS CRITICAL TO MANY APPLICATIONS. PULSE LASER DRIVEN PHOTOEMISSIVE AND PULSE HEATED THERMIONIC CATHODES HAVE RECENTLY BEEN SHOWN TO BE CAPABLE OF PRODUCING BEAMS WITH CURRENT DENSITIES EXCEEDING 100 A/CM(2) OVER 1 CM(2), AND WITH NORMALIZED BRIGHTNESSES AS HIGH AS 10(7) A/CM(2) RAD(2). CALCULATIONS INDICATE THAT WITH NEW METHODS OF COOLING, DUTY FACTORS AS HIGH AS 0.1 CAN BE ACHIEVED. IN ADDITION, WITH THESE CATHODES, EMISSION GATING IS POSSIBLE. THE PROPOSED WORK IS TO EXAMINE ANALYTICALLY IN DETAIL THE FEASIBILITY OF HIGH CURRENT DENSITY PHOTOEMISSIVE AND/OR PULSE HEATED THERMIONIC CATHODES SUITABLE FOR HIGH POWER MICROWAVE TUBES, INCLUDING OPTIMIZATION OF THE USE OF PRESENTLY KNOWN EMITTERS AS WELL AS A SEARCH FOR NEW MATERIALS.

* Information listed above is at the time of submission. *

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