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Nano-Patterned Cathode Surfaces for High Efficiency Photoinjectors

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-SC0009656
Agency Tracking Number: 222475
Amount: $999,709.00
Phase: Phase II
Program: STTR
Solicitation Topic Code: 05a
Solicitation Number: DE-FOA-0001405
Solicitation Year: 2016
Award Year: 2016
Award Start Date (Proposal Award Date): 2016-04-15
Award End Date (Contract End Date): 2018-04-14
Small Business Information
1717 Stewart Street
Santa Monica, CA 90404-4021
United States
DUNS: 140789137
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Gerard Andonian
 (310) 822-5845
Business Contact
 Alex Murokh
Title: Dr.
Phone: (310) 822-5845
Research Institution
 University of California Los Angeles
 P Musumeci
405 Hilgard Avenue
Los Angeles, CA 90095-1547
United States

 (310) 206-9164
 Nonprofit College or University

Metal photoinjector cathode development has shown recent promise with nano-patterning
technology. However, in order to be competitive with semi-conductor cathodes, a further
enhancement in efficiency is needed.
Specific nano-patterning of sub-wavelength features to produce antennae provides coupling of
incoming laser light with the surface of the metal cathode. Bowtie nano-antennae, in particular,
have shown to increase the local field emission by up to an order of magnitude. Coupling novel
nano-antennae in a high-current, superconducting injector shows promise to provide
unprecedented efficiency as a robust metal cathode.
The Phase II results demonstrated emission from a copper nano-patterned cathode that was 3000
times that of flat copper, with studies into pattern optimization, new materials like silver and
niobium, and new geometries such as trenches and bowties.
In Phase IIa, emphasis will be place on the fabrication of bowtie nano-antennae for superior
emission, and studies into patterning of niobium cathodes with planned testing in actual
superconducting radio frequency photoinjectors.
The results of the efforts will find immediate utility in present advanced accelerator and light
source facilitates that employ high brightness photoinjectors which have direct impact on
industrial, medical, defense and basic research applications.

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

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