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Title: Using a 2-shock 1D platform at NIF to measure the effect of convergence on mix and symmetry

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.5038570· OSTI ID:1637583
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Lawrence Livermore National Laboratory, Livermore, California 94559, USA
  4. General Atomics, San Diego, CA (United States)
+ Show Author Affiliations

In this paper, we describe the use of a robust new 1-D like implosion platform at the National Ignition Facility [G. H. Miller et al., Opt. Eng. 43, 2841 (2004)] to study the effect of convergence on mix and shape. Previous experiments suggest that nuclear yields and ion temperature degrade with increased convergence [M. D. Cable et al., Phys. Rev. Lett. 73, 2316 (1994)] due to enhanced perturbation growth and mix, but little has been reported on the distortion of the shape with time. The 2-shock platform was developed [S. F. Khan et al., Phys. Plasmas 23, 042708 (2016)] to maintain a high degree of sphericity during the whole implosion phase and has a thick, uniformly doped (1% Si) plastic CH shell to minimize the effect of mixing due to hydrodynamic feed-through from the outer ablator surface. An inner layer of deuterated plastic (CD) and hydrogen-tritium (DT) gas fill allows for the measurement of DT neutrons produced by the mix between the gas and ablator. DD neutrons provide information about the hot, unmixed CD region. By changing the fill gas density while keeping the capsule diameter, ablator thickness, and Au hohlraum conditions fixed, the x-ray hot spot convergence ratio was varied from 14 to 22. We find that the atomic mix (DT yield) grows linearly as a function of convergence, but since Tion changes as well, it does not necessarily mean that the amount or extent of mix grows linearly as well. Lastly, we also find the DD yield, which is a measurement of the shell heating, saturates above a certain convergence.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); General Atomics
Grant/Contract Number:
AC52-07NA27344; AC52-06NA25396; NA0001808
OSTI ID:
1637583
Alternate ID(s):
OSTI ID: 1476128; OSTI ID: 1479936
Report Number(s):
LLNL-JRNL-793197; LA-UR-18-21677; 992012; TRN: US2201640
Journal Information:
Physics of Plasmas, Vol. 25, Issue 10; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Cited By (2)

A simulation-based model for understanding the time dependent x-ray drive asymmetries and error bars in indirectly driven implosions on the National Ignition Facility journal June 2019
Pushered single shell implosions for mix and radiation trapping studies using high-Z layers on National Ignition Facility journal July 2019

Figures / Tables (22)

FIG. 1(p. 9)figure FIG. 1
Table 1(p. 10)table Table 1
Table 2(p. 11)table Table 2
FIG. 2(p. 12)figure FIG. 2
FIG. 3(p. 13)figure FIG. 3
FIG. 4(p. 13)figure FIG. 4
FIG. 5(p. 16)figure FIG. 5
FIG. 6(p. 17)figure FIG. 6
FIG. 7(p. 17)figure FIG. 7
FIG. 8(p. 19)figure FIG. 8
Table 3(p. 20)table Table 3
FIG. 9(p. 21)figure FIG. 9
FIG. 10(p. 22)figure FIG. 10
FIG. 11(p. 23)figure FIG. 11
FIG. 12(p. 25)figure FIG. 12
FIG. 13(p. 27)figure FIG. 13
FIG. 14(p. 27)figure FIG. 14
FIG. 15(p. 28)figure FIG. 15
FIG. 16(p. 29)figure FIG. 16
FIG. 17(p. 30)figure FIG. 17
FIG. 18(p. 31)figure FIG. 18
Table 4(p. 32)table Table 4

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Bremsstrahlung
x-ray imaging
isotopes
nuclear symmetry energy
electromagnetic radiation detectors
plasma confinement
x-ray spectroscopy
tritium
Implosion
NIF
copnvergence