Secondary emission electron gun using external primaries

Srinivasan-Rao, Triveni; Ben-Zvi, Ilan; Kewisch, Jorg; Chang, Xiangyun

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:

Srinivasan-Rao, Triveni ^[1]; Ben-Zvi, Ilan ^[2]; Kewisch, Jorg ^[3]; Chang, Xiangyun ^[4]

Shoreham, NY
Setauket, NY
Wading River, NY
Middle Island, NY

Issue Date:: 2007-06-05

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

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H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
H01J25/04 - Tubes having one or more resonators, without reflection of the electron stream, and in which the modulation produced in the modulator zone is mainly density modulation, e.g. Heaff tube
H01J23/06 - Electron or ion guns

H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05H - PLASMA TECHNIQUE
H05H15/00 - Methods or devices for acceleration of charged particles not otherwise provided for

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
H01J3/021 - {Electron guns using a field emission, photo emission, or secondary emission electron source}

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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.

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                    Srinivasan-Rao, Triveni, Ben-Zvi, Ilan, Kewisch, Jorg, & Chang, Xiangyun. Secondary emission electron gun using external primaries.  United States.

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                    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.

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@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

Yater, J. E.; Shih, A.; Butler, J. E.
Journal of Applied Physics, Vol. 93, Issue 5
https://doi.org/10.1063/1.1544648

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

Krainsky, I. L.; Asnin, V. M.; Mearini, G. T.
Physical Review B, Vol. 53, Issue 12
https://doi.org/10.1103/PhysRevB.53.R7650

Secondary electron emission from diamond surfaces
journal, August 1997

Shih, A.; Yater, J.; Pehrsson, P.
Journal of Applied Physics, Vol. 82, Issue 4
https://doi.org/10.1063/1.365990

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

Yater, J. E.; Shih, A.; Abrams, R.
Physical Review B, Vol. 56, Issue 8
https://doi.org/10.1103/PhysRevB.56.R4410

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

Krainsky, I. L.; Asnin, V. M.; Dayton, J. A.
Applied Surface Science, Vol. 111
https://doi.org/10.1016/S0169-4332(96)00731-3

Decay of secondary electron emission and charging of hydrogenated and hydrogen-free diamond film surfaces induced by low energy electrons
journal, April 2002

Hoffman, A.; Laikhtman, A.; Ustaze, S.
Journal of Applied Physics, Vol. 91, Issue 7
https://doi.org/10.1063/1.1456944

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Title: Secondary emission electron gun using external primaries

Abstract

Citation Formats

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

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

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

Decay of secondary electron emission and charging of hydrogenated and hydrogen-free diamond film surfaces induced by low energy electrons
journal, April 2002