Trending low mode asymmetries in NIF capsule drive using a simple viewfactor metric *

MacGowan, B. J.; Landen, O. L.; Casey, D. T.; Young, C. V.; Callahan, D. A.; Hartouni, E. P.; Hatarik, R.; Hohenberger, M.; Ma, T.; Mariscal, D.; Moore, A.; Nora, R.; Rinderknecht, H. G.; Schlossberg, D.; Van Wonterghem, B. M.

doi:10.1016/j.hedp.2021.100944

Title: Trending low mode asymmetries in NIF capsule drive using a simple viewfactor metric *

Journal Article · Sun Aug 01 00:00:00 EDT 2021 · High Energy Density Physics

DOI:https://doi.org/10.1016/j.hedp.2021.100944· OSTI ID:1798222

MacGowan, B. J.; Landen, O. L.; Casey, D. T.; Young, C. V.; Callahan, D. A.; Hartouni, E. P.; Hatarik, R.; Hohenberger, M.; Ma, T.; Mariscal, D.; Moore, A.; Nora, R.; Rinderknecht, H. G.; Schlossberg, D.; Van Wonterghem, B. M.

The mode-1 x-ray drive asymmetry of indirect-drive Inertial Confinement Fusion(ICF) implosions at the National Ignition Facility(NIF) has been estimated using a simple static ViewFactor model. The model takes as input measured laser performance data in the foot and peak, the hohlraum configuration, and laser to hohlraum pointing. These estimates are compared with neutron time-of-flight measurements of directionality and magnitude of the resultant hotspot bulk velocity (~20–100 μm/ns) for 39 NIF shots using High Density Carbon (HDC) ablators and show strong correlation on a statistically significant number of shots. The most important factors identified so far are random quad-to-quad peak power laser imbalances, the presence of lossy diagnostic windows and gaps on the hohlraum waist, capsule sag and capsule thickness mode 1. Typical mode-1 asymmetry in drive is currently ~0.5% for many of these sources on their own and, when summed, can lead to a neutron hotspot velocity of up to 100 μm /ns and a reduction in yield of 35% for current NIF DT layered implosions. Our goal is to identify, quantify and mitigate all potential sources of mode-1 asymmetry (which also include target and laser alignment imperfections, foot power and Cross Beam Energy Transfer imbalances) to enable higher quality implosions on NIF.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1798222

Alternate ID(s):: OSTI ID: 1843136

Report Number(s):: LLNL-JRNL-804082; S1574181821000197; 100944; PII: S1574181821000197

Journal Information:: High Energy Density Physics, Journal Name: High Energy Density Physics Vol. 40 Journal Issue: C; ISSN 1574-1818

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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