Stability Measurements for Alignment of the NIF Neutron Imaging System Pinhole Array

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The alignment system for the National Ignition Facility's neutron imaging system has been commissioned and measurements of the relative stability of the 90-315 DIM, the front and the back of the neutron imaging pinhole array and an exploding pusher target have been made using the 90-135 and the 90-258 opposite port alignment systems. Additionally, a laser beam shot from the neutron-imaging Annex and reflected from a mirror at the back of the pinhole array was used to monitor the pointing of the pinhole. Over a twelve hour period, the relative stability of these parts was found to be within {approx} ... continued below

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PDF-file: 32 pages; size: 5.7 Mbytes

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Fittinghoff, D N; Bower, D E; Drury, O B; Dzenitis, J M; Frank, M; Buckles, R A et al. March 29, 2011.

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The alignment system for the National Ignition Facility's neutron imaging system has been commissioned and measurements of the relative stability of the 90-315 DIM, the front and the back of the neutron imaging pinhole array and an exploding pusher target have been made using the 90-135 and the 90-258 opposite port alignment systems. Additionally, a laser beam shot from the neutron-imaging Annex and reflected from a mirror at the back of the pinhole array was used to monitor the pointing of the pinhole. Over a twelve hour period, the relative stability of these parts was found to be within {approx} {+-}18 {micro}m rms even when using manual methods for tracking the position of the objects. For highly visible features, use of basic particle tracking techniques found that the front of the pinhole array was stable relative to the 90-135 opposite port alignment camera to within {+-}3.4 {micro}m rms. Reregistration, however, of the opposite port alignment systems themselves using the target alignment sensor was found to change the expected position of target chamber center by up to 194 {micro}m.

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PDF-file: 32 pages; size: 5.7 Mbytes

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  • Report No.: LLNL-TR-477431
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/1022147 | External Link
  • Office of Scientific & Technical Information Report Number: 1022147
  • Archival Resource Key: ark:/67531/metadc837898

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Creation Date

  • March 29, 2011

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Dec. 2, 2016, 12:31 p.m.

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Fittinghoff, D N; Bower, D E; Drury, O B; Dzenitis, J M; Frank, M; Buckles, R A et al. Stability Measurements for Alignment of the NIF Neutron Imaging System Pinhole Array, report, March 29, 2011; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc837898/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.