Field emission cathode gating for RF electron guns and planar focusing cathodes
Abstract
A novel method of gating electron emission from field-emitter cathodes for radio frequency (RF) electrode guns and a novel cathode that provides a focused electron beam without the need for magnetic fields or a curved cathode surface are provided. The phase and strength of a predefined harmonic field, such as the 3rd harmonic field, are adjusted relative to a fundamental field to cause a field emission cathode to emit electrons at predefined times for the generation of high-brightness electron beams. The emission time is gated responsive to the combined harmonic and fundamental fields and the response of the FE cathode to the combined fields. A planar focusing cathode includes a selected dielectric material, such as a ceramic material, to provide an electron beam emission surface. Metal surfaces are provided both radially around and behind the dielectric material to shape the electric fields that accelerate and guide the beam from the cathode surface.
- Inventors:
- Issue Date:
- Research Org.:
- Univ. of Chicago, IL (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1531501
- Patent Number(s):
- 6987361
- Application Number:
- 10/887,142
- Assignee:
- The University of Chicago (Chicago, IL)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- DOE Contract Number:
- W-31-109-ENG-38
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2004-07-08
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Citation Formats
Lewellen, John W., and Noonan, John. Field emission cathode gating for RF electron guns and planar focusing cathodes. United States: N. p., 2006.
Web.
Lewellen, John W., & Noonan, John. Field emission cathode gating for RF electron guns and planar focusing cathodes. United States.
Lewellen, John W., and Noonan, John. Tue .
"Field emission cathode gating for RF electron guns and planar focusing cathodes". United States. https://www.osti.gov/servlets/purl/1531501.
@article{osti_1531501,
title = {Field emission cathode gating for RF electron guns and planar focusing cathodes},
author = {Lewellen, John W. and Noonan, John},
abstractNote = {A novel method of gating electron emission from field-emitter cathodes for radio frequency (RF) electrode guns and a novel cathode that provides a focused electron beam without the need for magnetic fields or a curved cathode surface are provided. The phase and strength of a predefined harmonic field, such as the 3rd harmonic field, are adjusted relative to a fundamental field to cause a field emission cathode to emit electrons at predefined times for the generation of high-brightness electron beams. The emission time is gated responsive to the combined harmonic and fundamental fields and the response of the FE cathode to the combined fields. A planar focusing cathode includes a selected dielectric material, such as a ceramic material, to provide an electron beam emission surface. Metal surfaces are provided both radially around and behind the dielectric material to shape the electric fields that accelerate and guide the beam from the cathode surface.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 17 00:00:00 EST 2006},
month = {Tue Jan 17 00:00:00 EST 2006}
}
Works referenced in this record:
Variable energy highly efficient linear accelerator
patent, October 1978
- Vaguine, Victor A.
- US Patent Document 4,118,653
Works referencing / citing this record:
RF accelerator for imaging applications
patent, April 2007
- Lemaitre, Sergio
- US Patent Document 7,206,379
System and method for generating X-rays
patent, July 2009
- Lemaitre, Sergio
- US Patent Document 7,558,374