Derivation of preliminary specifications for transmitted wavefront and surface roughness for large optics used in inertial confinement fusion

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In preparation for beginning the design of the Nation Ignition Facility (NIF) in the United States and the Laser Mega-Joule (LMJ) in France, the authors are in the process of deriving new specifications for the large optics required for these facilities. Traditionally, specifications for transmitted wavefront and surface roughness of large ICF optics have been based on parameters which were easily measured during the early 1980`s, such as peak-to-valley wavefront error (PV) and root-mean-square (RMS) surface roughness, as well as wavefront gradients in terms of waves per cm. While this was convenient from a fabrication perspective, since the specifications could ... continued below

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13 p.

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Aikens, D.; Roussel, A. & Bray, M. June 27, 1995.

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  • Aikens, D. Lawrence Livermore National Lab., CA (United States)
  • Roussel, A.
  • Bray, M. CEA-DAM, Villeneuve St. Georges (France). Centre d`etude de Limeil-Valenton (CEL-V)

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Description

In preparation for beginning the design of the Nation Ignition Facility (NIF) in the United States and the Laser Mega-Joule (LMJ) in France, the authors are in the process of deriving new specifications for the large optics required for these facilities. Traditionally, specifications for transmitted wavefront and surface roughness of large ICF optics have been based on parameters which were easily measured during the early 1980`s, such as peak-to-valley wavefront error (PV) and root-mean-square (RMS) surface roughness, as well as wavefront gradients in terms of waves per cm. While this was convenient from a fabrication perspective, since the specifications could be easily interpreted by fabricators in terms which were understood and conventionally measurable, it did not accurately reflect the requirements of the laser system. For the NIF and LMJ laser systems, the authors use advances in metrology and interferometry and an enhanced understanding of laser system performance to derive specifications which are based on power spectral densities (PSD`s.) Such requirements can more accurately reflect the requirements of the laser system for minimizing the amplitude of mid- and high-spatial frequency surface and transmitted wavefront errors, while not over constraining the fabrication in terms of low spatial frequencies, such as residual coma or astigmatism, which are typically of a very large amplitude compared to periodic errors. In order to study the effect of changes in individual component tolerances, it is most useful to have a model capable of simulating real behavior. The basis of this model is discussed in this paper, outlining the general approach to the {open_quotes}theoretical{close_quotes} study of ICF optics specifications, and an indication of the type of specification to be expected will be shown, based upon existing ICF laser optics.

Physical Description

13 p.

Notes

INIS; OSTI as DE95015975

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  • Other Information: PBD: 27 Jun 1995

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  • Other: DE95015975
  • Report No.: UCRL-ID--121339
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/88573 | External Link
  • Office of Scientific & Technical Information Report Number: 88573
  • Archival Resource Key: ark:/67531/metadc793809

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

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Creation Date

  • June 27, 1995

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • Feb. 16, 2016, 6:17 p.m.

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Aikens, D.; Roussel, A. & Bray, M. Derivation of preliminary specifications for transmitted wavefront and surface roughness for large optics used in inertial confinement fusion, report, June 27, 1995; California. (digital.library.unt.edu/ark:/67531/metadc793809/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.