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Title: Control of low-mode drive asymmetry in an efficient long-pulse low gas-fill density Hohlraum

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/5.0136145· OSTI ID:1971298
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  1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  2. General Atomics, La Jolla, California 92121 (United States)

Laser-driven Hohlraums filled with gas at lower densities (<0.6 mg/cc) have higher efficiency compared to original ≥ 0.96 mg/cc fill because of reduced backscatter losses [Hall et al., Phys. Plasmas 24, 052706 (2017)]. However, using low-density filled Hohlraums with longer drive required for lower adiabat implosions, and hence potentially higher inertial confinement fusion gain designs, has been challenging since the Hohlraum wall blow-off is less tamped, thus altering the laser beam absorption regions and drive symmetry. A series of NIF experiments using optimized pulse shaping, beam pointing, and temporal phasing have demonstrated, through imaging of the Hohlraum and capsule dynamics, that a symmetric implosion using a 14-ns low-adiabat drive pulse {2× longer than high-density-carbon ablator designs using low gas-fill density Hohlraums [Divol et al., Phys. Plasmas 24, 056309 (2017)]} is possible in a low backscatter loss 0.45 mg/cc He-filled Hohlraum. The ingress of the Hohlraum walls was mitigated by revisiting the adiabat-shaped design [Clark et al., Phys. Plasmas 21, 112705 (2014)] that uses a low-power (1 TW) trough that delays the wall expansion. Low-mode P2 and P4 drive asymmetry swings caused by the drift of the laser spots were essentially zeroed out by employing temporal beam phasing between cones of beams [Turner et al., Phys. Plasmas 7, 333 (2000)]. So the results also indicate an improved coupling efficiency of ~30% compared to an earlier design using higher density filled Hohlraums and pave the way for revisiting low-adiabat, high convergence drives using CH ablators.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); General Atomics, La Jolla, California 92121 (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
AC52-07NA27344; 89233119CNA000063
OSTI ID:
1971298
Alternate ID(s):
OSTI ID: 1963733
Report Number(s):
LLNL-JRNL-842205; 1064151; TRN: US2313555
Journal Information:
Physics of Plasmas, Vol. 30, Issue 3; Conference: 64. Annual Meeting of the APS Division of Plasma Physics, Spokane, WA (United States), 17-21 Oct 2022; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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