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Title: Secondary emission electron gun using external primaries

Abstract

An electron gun for generating an electron beam is provided, which includes a secondary emitter. The secondary emitter includes a non-contaminating negative-electron-affinity (NEA) material and emitting surface. The gun includes an accelerating region which accelerates the secondaries from the emitting surface. The secondaries are emitted in response to a primary beam generated external to the accelerating region. The accelerating region may include a superconducting radio frequency (RF) cavity, and the gun may be operated in a continuous wave (CW) mode. The secondary emitter includes hydrogenated diamond. A uniform electrically conductive layer is superposed on the emitter to replenish the extracted current, preventing charging of the emitter. An encapsulated secondary emission enhanced cathode device, useful in a superconducting RF cavity, includes a housing for maintaining vacuum, a cathode, e.g., a photocathode, and the non-contaminating NEA secondary emitter with the uniform electrically conductive layer superposed thereon.

Inventors:
 [1];  [2];  [3];  [4]
  1. Shoreham, NY
  2. Setauket, NY
  3. Wading River, NY
  4. Middle Island, NY
Issue Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
909577
Patent Number(s):
7227297
Application Number:
10/917,309
Assignee:
Brookhaven Science Associates, LLC (Upton, NY)
Patent Classifications (CPCs):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05H - PLASMA TECHNIQUE
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Srinivasan-Rao, Triveni, Ben-Zvi, Ilan, Kewisch, Jorg, and Chang, Xiangyun. Secondary emission electron gun using external primaries. United States: N. p., 2007. Web.
Srinivasan-Rao, Triveni, Ben-Zvi, Ilan, Kewisch, Jorg, & Chang, Xiangyun. Secondary emission electron gun using external primaries. United States.
Srinivasan-Rao, Triveni, Ben-Zvi, Ilan, Kewisch, Jorg, and Chang, Xiangyun. Tue . "Secondary emission electron gun using external primaries". United States. https://www.osti.gov/servlets/purl/909577.
@article{osti_909577,
title = {Secondary emission electron gun using external primaries},
author = {Srinivasan-Rao, Triveni and Ben-Zvi, Ilan and Kewisch, Jorg and Chang, Xiangyun},
abstractNote = {An electron gun for generating an electron beam is provided, which includes a secondary emitter. The secondary emitter includes a non-contaminating negative-electron-affinity (NEA) material and emitting surface. The gun includes an accelerating region which accelerates the secondaries from the emitting surface. The secondaries are emitted in response to a primary beam generated external to the accelerating region. The accelerating region may include a superconducting radio frequency (RF) cavity, and the gun may be operated in a continuous wave (CW) mode. The secondary emitter includes hydrogenated diamond. A uniform electrically conductive layer is superposed on the emitter to replenish the extracted current, preventing charging of the emitter. An encapsulated secondary emission enhanced cathode device, useful in a superconducting RF cavity, includes a housing for maintaining vacuum, a cathode, e.g., a photocathode, and the non-contaminating NEA secondary emitter with the uniform electrically conductive layer superposed thereon.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {6}
}

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Works referenced in this record:

Transmission of low-energy electrons in boron-doped nanocrystalline diamond films
journal, March 2003


Negative-electron-affinity effect on the surface of chemical-vapor-deposited diamond polycrystalline films
journal, March 1996


Secondary electron emission from diamond surfaces
journal, August 1997


Electron transport and emission properties of C(100)
journal, August 1997


Secondary electron emission from chemical vapor deposited diamond films with nagative electron affinity
journal, February 1997