RF Gun with High-Current-Density Field Emission Cathode

Award Information
Agency:
Department of Energy
Amount:
$100,000.00
Program:
STTR
Contract:
DE-FG02-04ER86193
Solitcitation Year:
2004
Solicitation Number:
DOE/SC-0075
Branch:
N/A
Award Year:
2004
Phase:
Phase I
Agency Tracking Number:
75748T04-I
Solicitation Topic Code:
5
Small Business Information
Omega-p, Inc.
199 Whitney Avenue, New Haven, CT, 06511
Hubzone Owned:
N
Woman Owned:
N
Socially and Economically Disadvantaged:
N
Duns:
N/A
Principal Investigator
 Jay Hirshfield
 Dr.
 (203) 548-1144
 jay@omega-p.com
Business Contact
 George Trahan
Title: Dr.
Phone: (203) 548-1144
Email: trahan@omega-p.com
Research Institution
 Florida International University
 J. Torres
 11200 SW 8th St
MARC 430
Miami, FL, 33199
 Nonprofit college or university
Abstract
75748-Cathodes have a dominant influence on the quality of the electron beams produced from laser photo-cathodes in radio frequency (rf) guns used as injectors in many electron accelerators. Similar limitations are also suffered by thermionic cathodes in diode guns used in high-power rf amplifiers for accelerator applications. These limitations could be surmounted by a field-emission cold cathode capable of high current density. This project will combine the high-current-density field emission from an array of carbon nanotubes with secondary electron channel multiplication in a ceramic facing structure, to produce a cold cathode of exceptional promise for rf guns and diode guns. The cathode will be installed and tested in an existing S-band 2-1/2 cell rf gun. With emission control and modulation, and with current density in the range of 1 kA/cm2, this cathode could provide performance and long-life not enjoyed by other currently-available cathodes. In Phase I, electrodynamic and space-charge flow simulations will be conducted to specify the cathode configuration as well as the range of emission current density from the field-emission cold cathode. Design and preliminary tests will be conducted prior to the fabrication of the gun during Phase II. Commercial Applications and Other Benefits as described by the awardee: Replacing thermionic cathodes and laser photocathodes in rf guns and diode guns by a cold cathode with high-current-density and long lifetime could improve device performance and lower costs. Applications in a range of commercial and military vacuum electronics devices could be anticipated.

* information listed above is at the time of submission.

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