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Secondary emission electron gun using external primaries

Patent ·
OSTI ID:909577
 [1];  [2];  [3];  [4]
  1. Shoreham, NY
  2. Setauket, NY
  3. Wading River, NY
  4. Middle Island, NY
+ Show Author Affiliations
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.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY
Sponsoring Organization:
United States Department of Energy
DOE Contract Number:
AC02-98CH10886
Assignee:
Brookhaven Science Associates, LLC (Upton, NY)
Patent Number(s):
7,227,297
Application Number:
10/917,309
OSTI ID:
909577
Country of Publication:
United States
Language:
English

References (6)

Negative-electron-affinity effect on the surface of chemical-vapor-deposited diamond polycrystalline films journal March 1996
Electron transport and emission properties of C(100) journal August 1997
Secondary electron emission from diamond surfaces journal August 1997
Decay of secondary electron emission and charging of hydrogenated and hydrogen-free diamond film surfaces induced by low energy electrons journal April 2002
Transmission of low-energy electrons in boron-doped nanocrystalline diamond films journal March 2003
Secondary electron emission from chemical vapor deposited diamond films with nagative electron affinity journal February 1997

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