Enhanced Quantum Efficiency of Photocathodes with Polarized Emission

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$149,565.00
Award Year:
2011
Program:
SBIR
Phase:
Phase I
Contract:
DE-FG02-11ER90137
Award Id:
n/a
Agency Tracking Number:
97818
Solicitation Year:
2011
Solicitation Topic Code:
44 e
Solicitation Number:
DE-FOA-0000413
Small Business Information
7620 Executive Drive, Eden Prairie, MN, 55344-3677
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
876868647
Principal Investigator:
Aaron Moy
Dr.
(952) 934-2100
moy@svta.com
Business Contact:
Leslie Price
Ms.
(952) 934-2100
price@svta.com
Research Institute:
Stub




Abstract
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.

* information listed above is at the time of submission.

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