O-d energetics scaling models for Z-pinch-driven hohlraums Page: 2 of 49
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efficiency (15% wall plug), large x-ray powers and energies (>150 TW, >1 MJ in 7 ns), large
characteristic hohlraum volumes (0.5 to > 10 cm3), and long pulse-lengths (5 to 20 ns) may make
Z-pinches a good match to the requirements for driving high-yield scale ICF capsules with
adequate radiation symmetry and margin. Assessment of Z-pinches for high-yield ICF is one of
the goals of the research program at Sandia. Three different geometries are being studied to
harness Z-pinches for indirect-drive ICF: the dynamic hohlraum [Nash et al. 1999; Slutz et al.
2000], static-wall hohlraum [Olson et al. 1999; Sanford et al. 1999], and Z-pinch driven hohlraum
[Porter 1997; Hammer et al. 1999; Cuneo et al. 1999a, 1999b, 2000a]. Each of these approaches
has a fundamentally different drive geometry, and hence different potential strengths and
concerns, which have been previously described [Matzen et al. 1997; Leeper et al. 1999]. This
paper describes 0-d hohlraum energetics models to relate x-ray power to hohlraum wall
temperatures for four Z-pinch driven hohlraum configurations.
The Z-pinch Driven Hohlraum (ZPDH) concept is depicted in Fig. 1. In this concept, z-
pinches are located in two primary radiation cavities or source hohlraums on either end of a
secondary radiation cavity or capsule hohlraum. The majority of the secondary drive comes from
re-radiation of the primary wall (> 70 % of the flux, according to the models discussed below).
Less than 30% of the secondary wall drive comes from direct-pinch illumination. This topology
of coupling two hot x-ray source regions to a cooler ICF secondary is similar to some indirectly-
driven laser hohlraum geometries [Lindl 1995; Rosen 1996]. Radiation flows into the secondary,
through Be-spoke assemblies which are largely transparent to x-rays, and which also act to carry
the Z-pinch current, as well as confine the Z-pinch plasma to the primary region. Experimentally,
these Be spokes are observed to maintain their spoke-like character throughout the power pulse
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CUNEO,MICHAEL E.; VESEY,ROGER A.; HAMMER,J.H. & PORTER,JOHN L. O-d energetics scaling models for Z-pinch-driven hohlraums, article, June 8, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc709536/m1/2/: accessed February 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.