A flat-cathode thermionic injector for the PHERMEX Radiographic Facility

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The PHERMEX (Pulsed High-Energy Radiographic Machine Emitting X-rays) standing-wave linear accelerator is a high-current electron beam generator used for flash-radiography. An improved electron gun has been designed employing a flat-thermionic cathode to replace the existing Pierce-geometry gun. The flat cathode yields increased current with the same applied voltage and cathode area as the Pierce gun. The ISIS code simulations indicate a beam current of 1.5 kA at 600 kV. The new geometry also reduces the probability for high voltage breakdown in the A-K gap. A reentrant magnet captures the expanding electron beam and a bucking coil nulls cathode-tinge field. A ... continued below

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Pages: (4 p)

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Kauppila, T.; Builta, L.; Burns, M.; Gregory, W.; Honaberger, D.; Watson, S. (Los Alamos National Lab., NM (United States)) et al. January 1, 1993.

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Description

The PHERMEX (Pulsed High-Energy Radiographic Machine Emitting X-rays) standing-wave linear accelerator is a high-current electron beam generator used for flash-radiography. An improved electron gun has been designed employing a flat-thermionic cathode to replace the existing Pierce-geometry gun. The flat cathode yields increased current with the same applied voltage and cathode area as the Pierce gun. The ISIS code simulations indicate a beam current of 1.5 kA at 600 kV. The new geometry also reduces the probability for high voltage breakdown in the A-K gap. A reentrant magnet captures the expanding electron beam and a bucking coil nulls cathode-tinge field. A third coil is used to optimize the extraction field profile and reduce the effect of nonlinear space charge on the beam emittance. Time-resolved measurements of beam current and voltage have been made. In addition, a streak camera was used to measure beam emittance and spatial profile. Comparisons of measurements with simulations are presented.

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Pages: (4 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • International particle accelerator conference, Washington, DC (United States), 17-20 May 1993

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  • Other: DE93014584
  • Report No.: LA-UR-93-1715
  • Report No.: CONF-930511--104
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6480673
  • Archival Resource Key: ark:/67531/metadc1210217

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  • January 1, 1993

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Aug. 17, 2018, 1:48 p.m.

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Kauppila, T.; Builta, L.; Burns, M.; Gregory, W.; Honaberger, D.; Watson, S. (Los Alamos National Lab., NM (United States)) et al. A flat-cathode thermionic injector for the PHERMEX Radiographic Facility, article, January 1, 1993; United States. (https://digital.library.unt.edu/ark:/67531/metadc1210217/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.