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Production Manufacturing of Gold-Depleted Uranium Layered Hohlraums for the National Ignition Facility

N. A. Hein, H. L. Wilkens, A. Nikroo, H.-C. B. Chen, H. H. Streckert, K. Quan, J. R. Wall, T. A. Fuller, M. R. Jackson, E. M. Giraldez, S. J. Price, R. J. Sohn, M. Stadermann

Fusion Science and Technology / Volume 63 / Number 2 / March 2013 / Pages 218-225

Technical Paper / Selected papers from 20th Target Fabrication Meeting, May 20-24, 2012, Santa Fe, NM, Guest Editor: Robert C. Cook

By making the hohlraum wall more opaque to the driver energy, the efficiency of X-ray conversion is improved with the addition of depleted uranium (DU) to a gold-only hohlraum [see T. J. Orzechowski et al., Phys. Rev. Lett., Vol. 77, p. 3545 (1996)]. The National Ignition Facility (NIF) point design for ignition requires a DU hohlraum, which is manufactured by General Atomics. The process of creating a hohlraum with multiple layers presents manufacturing challenges. To produce these components many steps are required. The processes for manufacturing an Au-lined DU hohlraum requires single-point diamond turning, sputter deposition, electroplating, chemical etch, and cleaning. These steps combined make a process that yields a fully intact Au-DU layered NIF ignition hohlraum.

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