X-ray Streak Camera Cathode Development and Timing Accuracy of the 4w UV Fiducial System at the National Ignition Facility

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The convergent ablator experiments at the National Ignition Facility (NIF) are designed to measure the peak velocity and remaining ablator mass of an indirectly driven imploding capsule. Such a measurement can be performed using an x-ray source to backlight the capsule and an x-ray streak camera to record the capsule as it implodes. The ultimate goal of this experiment is to achieve an accuracy of 2% in the velocity measurement, which translates to a {+-}2 ps temporal accuracy over any 300 ps interval for the streak camera. In order to achieve this, a 4-{omega} (263nm) temporal fiducial system has been ... continued below

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Opachich, Y P; Palmer, N; Homoelle, D; Hatch, B W; Bell, P; Bradley, D et al. May 2, 2012.

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The convergent ablator experiments at the National Ignition Facility (NIF) are designed to measure the peak velocity and remaining ablator mass of an indirectly driven imploding capsule. Such a measurement can be performed using an x-ray source to backlight the capsule and an x-ray streak camera to record the capsule as it implodes. The ultimate goal of this experiment is to achieve an accuracy of 2% in the velocity measurement, which translates to a {+-}2 ps temporal accuracy over any 300 ps interval for the streak camera. In order to achieve this, a 4-{omega} (263nm) temporal fiducial system has been implemented for the x-ray streak camera at NIF. Aluminum, Titanium, Gold and Silver photocathode materials have been tested. Aluminum showed the highest quantum efficiency, with five times more peak signal counts per fiducial pulse when compared to Gold. The fiducial pulse data was analyzed to determine the centroiding a statistical accuracy for incident laser pulse energies of 1 and 10 nJ, showing an accuracy of {+-}1.6 ps and {+-}0.7 ps respectively.

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PDF-file: 9 pages; size: 1.6 Mbytes

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  • Presented at: 19th Topical Conference High-Temperature Plasma Diagnostics, Monterey, CA, United States, May 06 - May 10, 2012

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  • Report No.: LLNL-CONF-556394
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1044234
  • Archival Resource Key: ark:/67531/metadc831446

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  • May 2, 2012

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  • May 19, 2016, 9:45 a.m.

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  • Dec. 2, 2016, 6:42 p.m.

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Opachich, Y P; Palmer, N; Homoelle, D; Hatch, B W; Bell, P; Bradley, D et al. X-ray Streak Camera Cathode Development and Timing Accuracy of the 4w UV Fiducial System at the National Ignition Facility, article, May 2, 2012; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc831446/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.