AN ELECTRON-BEAM "GATLING GUN" FOR FREQUENCY MULTIPLYING IN MICROWAVE GENERATORS

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$749,982.00
Award Year:
1995
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
27289
Agency Tracking Number:
27289
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
10529-b Braddock Rd, Fairfax, VA, 22032
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Frederick M Mako
(703) 425-5111
Business Contact:
() -
Research Institute:
n/a
Abstract
A HIGH CURRENT, MICRO-PULSE ELECTRON SOURCE IS PLANNED FOR MICROWAVE FREQUENCY MULTIPLYING. THE DEVICE UTILIZES A ROTATING TRANSVERSE MAGNETIC (TM110) CAVITY MODE TO GENERATE A SERIES OF AZIMUTHALLY DISTRIBUTED BUNCHED ELECTRON PULSES AND IS THEREFORE SIMILAR TO A "GATLING GUN". EACH AZIMUTHAL ELECTRON BEAM PULSES TIME BY T/N WHERE T IS THE RADIO FREQUENCY (RF) PERIOD OF THE ROTATING MODE AND N IS THE NUMBER OF AZIMUTHAL BEAM PULSES CREATED. THE BUNCH PULSE LENGTH IS SMALL COMPARED TO THE SEPARATION TIME T/N. THESE ELECTRON PULSES ARE TRANSMITTED THROUGH ONE WALL OF THE CAVITY (E.G., BY A SCREEN), POST-ACCELERATED, AND FOCUSED ELECTRICALLY AND MAGNETICALLY INTO AN OUTPUT CAVITY TUNED TO AN INTEGER MULTIPLE OF THE FREQUENCY OF THE INPUT CAVITY. AS AN EXAMPLE, FOUR AZIMUTHAL ELECTRON PULSES FROM AN INPUT CAVITY DRIVEN AT 2.5 GHZ OPERATING IN THE TM110 ROTATING MODE WERE CONSIDERED. THE OUTPUT CAVITY WAS SELECTED AND CONFIRMED TO BE RESONANT AT 10 GHZ FOR THE TRANSVERSE MAGNETIC (TM040) MODE. THE CONCEPT OF PRODUCING ONE HIGH-CURRENT-DENSITY AZIMUTHAL ELECTRON BUNCH HAS BEEN STUDIED EXTENSIVELY. IN A DETAILED STUDY OF THIS PROCESS, INCLUDING SPACE CHARGE AND EMITTANCE, THE PARAMETE2RS NECESSARY TO MAKE USE OF THE PHENOMENON TO PRODUCE A MICRO-PULSED ELECTRON BEAM WERE DETERMINED. IT WAS SHOWN FROM SELF-CONSISTENT ANALYTIC THEORY AND 2-D PARTICLE-IN-CELL SIMULATIONS THAT THE CURRENT DENSITY SCALES WITH FREQUENCY CUBED. THIS DEVICE APPEARS TO BE CAPABLE OF HIGH CURRENTS (>KA) AND SHORT PULSES (PSEC). APPLICATIONS FOR THIS DEVICE ARE PRIMARILY RF GENERATION IN THE 10 TO 20 GHZ REGION, AND, IN PARTICULAR, FOR THE NEXT GENERATION OF LINEAR COLLIDERS. AN RF SOURCE POINT DESIGN WAS PERFORMED UTILIZING THE GATLING MICRO-PULSE GUN. IT APPEARS THAT AN OUTPUT RF POWER OF 100 MW AT 11.4 GHZ WITH 61 PE2RCENT SYSTEM EFFICIENCY IS ACHIEVABLE. PHASE I IS AIMED AT A DETAILED ANALYSIS TO ESTABLISH CREDIBLE ESTIMATES OF POWER, EFFICIENCY, GAIN, AND OTHER KEY PARAMETERS.

* information listed above is at the time of submission.

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