IMPROVED SOURCES OF SPIN-POLARIZED ELECTRONS

Award Information
Agency:
Department of Energy
Branch:
N/A
Amount:
$74,695.00
Award Year:
1993
Program:
SBIR
Phase:
Phase I
Contract:
N/A
Agency Tracking Number:
21091
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Spire Corp.
1 Patriots Park, Bedford, MA, 01730
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
N/A
Principal Investigator
 Dr Stanley M Vernon
 (617) 275-6000
Business Contact
Phone: () -
Research Institution
N/A
Abstract
PHOTOCATHODES THAT PRODUCE POLARIZED ELECTRONS ARE A VITAL COMPONENT OF THE ELECTRON COLLIDERS USED IN HIGH ENERGY PHYSICS EXPERIMENTS, SUCH AS THOSE AT THE STANFORD LINEAR ACCELERATOR CENTER (SLAC). THE YIELDS OF ELECTRONS FROM TODAY'S PHOTOCATHODES ARE LOW, REDUCING THE EFFECTIVENESS OF THESE SOPHISTICATED LINEAR ACCELERATOR INSTRUMENTS. THIS PROJECT SHOULD IMPROVE POLARIZED ELECTRON SOURCES BY OPTIMIZING THE DEPOSITION PROCESS USED TO MAKE THE PHOTOCATHODE LAYERED STRUCTURE. THE BASIC DEVICE STRUCTURE CONSISTS OF A THIN, STRAINED LAYER OF GALLIUM ARSENIDE (GAAS), ON A GALLIUM ARSENIDE PHOSPHIDE (GAASP) BUFFER REGION, ON A GAAS WAFER. CAREFUL DESIGN OPTIMIZATION IS NEEDED TO ACHIEVE MAXIMUM LAYER STRAIN, AND THEREFORE MAXIMUM YIELD OF POLARIZED ELECTRONS. TOO MUCH STRAIN RESULTS IN CRYSTAL DEFECTS WHICH SIGNIFICANTLY REDUCE PERFORMANCE. IN PHASE I, STRUCTURES WILL BE FORMED GBY METAL ORGANIC CHEMICAL VAPOR DEPOSITION (MOCVD); DEVICE PERFORMANCE WILL MEASURED AT SLAC. PHASE II WILL SEEK TO IMPROVE UPON RESULTS BY STUDYING MORE ADVANCED LAYER STRUCTURES AND DEVICE PROCESSING, AND DEPOSITION ON LARGER DIAMETER WAFERS.

* information listed above is at the time of submission.

Agency Micro-sites

US Flag An Official Website of the United States Government