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Enhanced Quantum Efficiency of Photocathodes with Polarized Emission

Award Information

Department of Energy
Award ID:
Program Year/Program:
2011 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
44 e
Solicitation Number:
Small Business Information
SVT Associates
7620 Executive Drive Eden Prairie, MN 55344-3677
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Woman-Owned: No
Minority-Owned: Yes
HUBZone-Owned: No
Phase 1
Fiscal Year: 2011
Title: Enhanced Quantum Efficiency of Photocathodes with Polarized Emission
Agency: DOE
Contract: DE-FG02-11ER90137
Award Amount: $149,565.00


The negative-electron-affinity (NEA) photocathodes which produce polarized electrons are a vital component of electron accelerators such as that at the Stanford Linear Accelerator Center (SLAC), which is used in the current generation of photocathodes. Quantum efficiencies thus far are on the order of 1%, meaning only 1% of the photons hitting the photocathode result in the emission of an electron. Increasing the quantum efficiency is vital to increasing the usable electron current. The end result of the combined Phase I Phase II effort will be a new generation of robust photocathodes capable of yielding intense, highly polarized electron beams for use in advanced electron colliders. We have previously achieved & gt 85% polarization using a strained-superlattice formed from alternating layers of GaAs and GaAsP approximately ten monolayers thick. For this program we will increase the quantum efficiency and extractable polarization current by adding an optical reflector to the design. Commercial Applications and Other Benefits: Spin polarized low energy electron microscopes (SPLEEM) and future colliders will benefit from a polarized electron beam with increased intensity.

Principal Investigator:

Aaron Moy

Business Contact:

Leslie A. Price
Small Business Information at Submission:

Svt Associates, Inc.
7620 Executive Drive Eden Prairie, MN 55344-3677

EIN/Tax ID: 411764876
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No