Multi-kiloampere, electron-beam generation from bare aluminum photo-cathodes driven by an ArF laser

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An electron-beam-pumped laser operating at ArF (193 nm) producing up to 5.0 joules in a 150-ns pulse has been used to illuminate micro-machined aluminum cathodes. The cathode was pulsed from 2.25- up to 2.95-MV across a 20-cm-AK gap producing fields up to 145 kV/cm using REX (a 4-MeV, 5-kA, 100-ns pulsed diode). Extracted current versus laser power gives a quantum efficiency increasing with power density from 0.07 to 0.11%. The present work is significant in that the cathode operates in the presence of out-gassing materials with a background vacuum pressure in the mid 10{sup {minus}6} torr region and 100-ns-long electron ... continued below

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4 p.

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Carlson, R.L.; Ridlon, R.N.; Seitz, G.J. & Hughes, T.P. October 1, 1997.

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An electron-beam-pumped laser operating at ArF (193 nm) producing up to 5.0 joules in a 150-ns pulse has been used to illuminate micro-machined aluminum cathodes. The cathode was pulsed from 2.25- up to 2.95-MV across a 20-cm-AK gap producing fields up to 145 kV/cm using REX (a 4-MeV, 5-kA, 100-ns pulsed diode). Extracted current versus laser power gives a quantum efficiency increasing with power density from 0.07 to 0.11%. The present work is significant in that the cathode operates in the presence of out-gassing materials with a background vacuum pressure in the mid 10{sup {minus}6} torr region and 100-ns-long electron beams of up to 3 kA have been produced. Both emission limited (current follows laser pulse) and space-charge-limited (current follows pulsed power) regimes have been studied up to {approximately} 50 A/cm{sup 2} by varying the cathode diameter. The beam temperature has been measured to be < 5 eV and directly compared in the same experimental setup to velvet based cathodes that measure {approximately} 100 eV.

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4 p.

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INIS; OSTI as DE97008182

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  • 17. IEEE particle accelerator conference, Vancouver (Canada), 12-16 May 1997

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  • Other: DE97008182
  • Report No.: LA-UR--97-1664
  • Report No.: CONF-970503--222
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 532549
  • Archival Resource Key: ark:/67531/metadc691423

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 29, 2016, 10:03 p.m.

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Carlson, R.L.; Ridlon, R.N.; Seitz, G.J. & Hughes, T.P. Multi-kiloampere, electron-beam generation from bare aluminum photo-cathodes driven by an ArF laser, article, October 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc691423/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.