Design of a High Field Stress, Velvet Cathode for the Flash X-Ray (FXR) Induction Accelerator

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A new cathode design has been proposed for the Flash X-Ray (FXR) induction linear accelerator with the goal of lowering the beam emittance. The original design uses a conventional Pierce geometry and applies a peak field of 134 kV/cm (no beam) to the velvet emission surface. Voltage/current measurements indicate that the velvet begins emitting near this peak field value and images of the cathode show a very non-uniform distribution of plasma light. The new design has a flat cathode/shroud profile that allows for a peak field stress of 230 kV/cm on the velvet. The emission area is reduced by about ... continued below

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Houck, T; Brown, C; Fleming, D; Kreitzer, B; Lewis, K; Ong, M et al. June 8, 2007.

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A new cathode design has been proposed for the Flash X-Ray (FXR) induction linear accelerator with the goal of lowering the beam emittance. The original design uses a conventional Pierce geometry and applies a peak field of 134 kV/cm (no beam) to the velvet emission surface. Voltage/current measurements indicate that the velvet begins emitting near this peak field value and images of the cathode show a very non-uniform distribution of plasma light. The new design has a flat cathode/shroud profile that allows for a peak field stress of 230 kV/cm on the velvet. The emission area is reduced by about a factor of four to generate the same total current due to the greater field stress. The relatively fast acceleration of the beam, approximately 2.5 MeV in 10 cm, reduces space charge forces that tend to hollow the beam for a flat, non-Pierce geometry. The higher field stress achieved with the same rise time is expected to lead to an earlier and more uniform plasma formation over the velvet surface. Simulations and initial testing are presented.

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PDF-file: 5 pages; size: 2.4 Mbytes

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  • Presented at: 2007 Particle Accelerator Conference, Albuquerque, NM, United States, Jun 25 - Jun 29, 2007

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  • Report No.: UCRL-PROC-231690
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 919963
  • Archival Resource Key: ark:/67531/metadc894668

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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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  • June 8, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 10:28 a.m.

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Houck, T; Brown, C; Fleming, D; Kreitzer, B; Lewis, K; Ong, M et al. Design of a High Field Stress, Velvet Cathode for the Flash X-Ray (FXR) Induction Accelerator, article, June 8, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc894668/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.