Measurements of direct drive laser imprint in thin foils by XUV radiography using an X-ray laser backlighter

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In direct drive inertial confinement fusion, the residual speckle pattern remaining after beam smoothing plays an important role in the seeding of instabilities at the ablation front. We have used an x-ray laser as an XUV backlighter to characterize the imprinted modulation in thin foils for smoothing by random phase plate and spectral dispersion at both 0.35 pm and 0.53 pm irradiation, and induced spatial incoherence at 0.53 pm irradiation. We also demonstrate measurements of the modulation due to a single mode optical imprint generated by a narrow slit interference pattern, and modification of the imprint with a superposed smooth ... continued below

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27 p.

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Kalantar, D.H.; Key, M.H. & DaSilva, L.B. November 1, 1996.

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Description

In direct drive inertial confinement fusion, the residual speckle pattern remaining after beam smoothing plays an important role in the seeding of instabilities at the ablation front. We have used an x-ray laser as an XUV backlighter to characterize the imprinted modulation in thin foils for smoothing by random phase plate and spectral dispersion at both 0.35 pm and 0.53 pm irradiation, and induced spatial incoherence at 0.53 pm irradiation. We also demonstrate measurements of the modulation due to a single mode optical imprint generated by a narrow slit interference pattern, and modification of the imprint with a superposed smooth irradiation to study time dependence of the imprinting process. 8 refs., 10 figs.

Physical Description

27 p.

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INIS; OSTI as DE97051946

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  • Meeting of the Division of Plasma Physics of the American Physical Society, Denver, CO (United States), 11-15 Nov 1996

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  • Other: DE97051946
  • Report No.: UCRL-JC--124654
  • Report No.: CONF-961102--9
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/464293 | External Link
  • Office of Scientific & Technical Information Report Number: 464293
  • Archival Resource Key: ark:/67531/metadc674173

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  • November 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • Feb. 17, 2016, 2:18 p.m.

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Kalantar, D.H.; Key, M.H. & DaSilva, L.B. Measurements of direct drive laser imprint in thin foils by XUV radiography using an X-ray laser backlighter, report, November 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc674173/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.