NIF optics phase gradient specfication

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A root-mean-square (rms) phase gradient specification seems to allow a good connection between the NIP optics quality and focal spot requirements. Measurements on Beamlet optics individually, and as a chain, indicate they meet the assumptions necessary to use this specification, and that they have a typical rms phase gradient of {approximately}80 {angstrom}/cm. This may be sufficient for NIP to meet the proposed Stockpile Stewardship Management Program (SSMP) requirements of 80% of a high- power beam within a 200-250 micron diameter spot. Uncertainties include, especially, the scale length of the optics phase noise, the ability of the adaptive optic to correct ... continued below

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27 p.; Other: FDE: PDF; PL:

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Williams, W.; Auerbach, J.; Hunt, J.; Lawson, L.; Manes, K.; Orth, C. et al. May 2, 1997.

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Description

A root-mean-square (rms) phase gradient specification seems to allow a good connection between the NIP optics quality and focal spot requirements. Measurements on Beamlet optics individually, and as a chain, indicate they meet the assumptions necessary to use this specification, and that they have a typical rms phase gradient of {approximately}80 {angstrom}/cm. This may be sufficient for NIP to meet the proposed Stockpile Stewardship Management Program (SSMP) requirements of 80% of a high- power beam within a 200-250 micron diameter spot. Uncertainties include, especially, the scale length of the optics phase noise, the ability of the adaptive optic to correct against pump-induced distortions and optics noise, and the possibility of finding mitigation techniques against whole-beam self-focusing (e.g. a pre- correction optic). Further work is needed in these areas to better determine the NIF specifications. This memo is a written summary of a presentation on this topic given by W. Williams 24 April 1997 to NIP and LS&T personnel.

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27 p.; Other: FDE: PDF; PL:

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INIS; OSTI as DE98050716

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  • Other Information: PBD: 2 May 1997

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  • Other: DE98050716
  • Report No.: UCRL-ID--127297
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/591793 | External Link
  • Office of Scientific & Technical Information Report Number: 591793
  • Archival Resource Key: ark:/67531/metadc690442

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  • May 2, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 17, 2016, 2:48 p.m.

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Williams, W.; Auerbach, J.; Hunt, J.; Lawson, L.; Manes, K.; Orth, C. et al. NIF optics phase gradient specfication, report, May 2, 1997; California. (digital.library.unt.edu/ark:/67531/metadc690442/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.