RF Gun with High-Current-Density Field Emission Cathode

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-04ER86193
Agency Tracking Number: 75748T04-I
Amount: $100,000.00
Phase: Phase I
Program: STTR
Awards Year: 2004
Solicitation Year: 2004
Solicitation Topic Code: 5
Solicitation Number: DOE/SC-0075
Small Business Information
199 Whitney Avenue, New Haven, CT, 06511
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Jay Hirshfield
 (203) 548-1144
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
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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