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Title: Demonstration of High Performance in Layered Deuterium-Tritium Capsule Implosions in Uranium Hohlraums at the National Ignition Facility

Journal Article · · Physical Review Letters
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. General Atomics, San Diego, CA (United States)
  6. Atomic Weapons Establishment (AWE), Berkshire (United Kingdom)

We report on the first layered deuterium-tritium (DT) capsule implosions indirectly driven by a “highfoot” laser pulse that were fielded in depleted uranium hohlraums at the National Ignition Facility. Recently, high-foot implosions have demonstrated improved resistance to ablation-front Rayleigh-Taylor instability induced mixing of ablator material into the DT hot spot [Hurricane et al., Nature (London) 506, 343 (2014)]. Uranium hohlraums provide a higher albedo and thus an increased drive equivalent to an additional 25 TW laser power at the peak of the drive compared to standard gold hohlraums leading to higher implosion velocity. Additionally, we observe an improved hot-spot shape closer to round which indicates enhanced drive from the waist. In contrast to findings in the National Ignition Campaign, now all of our highest performing experiments have been done in uranium hohlraums and achieved total yields approaching 1016 neutrons where more than 50% of the yield was due to additional heating of alpha particles stopping in the DT fuel.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center, High Energy Density Physics Div.
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001857; AC52-07NA27344
OSTI ID:
1209256
Alternate ID(s):
OSTI ID: 1203818
Journal Information:
Physical Review Letters, Vol. 115, Issue 5; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 86 works
Citation information provided by
Web of Science

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Cited By (42)

Theoretical and simulation research of hydrodynamic instabilities in inertial-confinement fusion implosions journal March 2017
Progress in octahedral spherical hohlraum study journal January 2016
First demonstration of improving laser propagation inside the spherical hohlraums by using the cylindrical laser entrance hole journal January 2016
First experimental comparisons of laser-plasma interactions between spherical and cylindrical hohlraums at SGIII laser facility journal March 2017
Inertially confined fusion plasmas dominated by alpha-particle self-heating journal April 2016
Inertial-confinement fusion with lasers journal May 2016
Enhanced energy coupling for indirectly driven inertial confinement fusion journal October 2018
Advances in x-ray framing cameras at the National Ignition Facility to improve quantitative precision in x-ray imaging journal February 2016
Integrated modeling of cryogenic layered highfoot experiments at the NIF journal May 2016
A hybrid-drive nonisobaric-ignition scheme for inertial confinement fusion journal August 2016
Experimental results of radiation-driven, layered deuterium-tritium implosions with adiabat-shaped drives at the National Ignition Facility journal October 2016
Examining the radiation drive asymmetries present in the high foot series of implosion experiments at the National Ignition Facility journal May 2017
Hydrodynamic instability growth of three-dimensional modulations in radiation-driven implosions with “low-foot” and “high-foot” drives at the National Ignition Facility journal April 2017
The role of hot spot mix in the low-foot and high-foot implosions on the NIF journal May 2017
The potential of imposed magnetic fields for enhancing ignition probability and fusion energy yield in indirect-drive inertial confinement fusion journal June 2017
A comprehensive alpha-heating model for inertial confinement fusion journal January 2018
On the importance of minimizing “coast-time” in x-ray driven inertially confined fusion implosions journal September 2017
Hydro-instability growth of perturbation seeds from alternate capsule-support strategies in indirect-drive implosions on National Ignition Facility journal October 2017
Capsule physics comparison of National Ignition Facility implosion designs using plastic, high density carbon, and beryllium ablators journal March 2018
Comparison of plastic, high density carbon, and beryllium as indirect drive NIF ablators journal May 2018
The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments journal August 2018
Analysis of trends in experimental observables: Reconstruction of the implosion dynamics and implications for fusion yield extrapolation for direct-drive cryogenic targets on OMEGA journal June 2018
Theory of alpha heating in inertial fusion: Alpha-heating metrics and the onset of the burning-plasma regime journal July 2018
First demonstration of improved capsule implosions by reducing radiation preheat in uranium vs gold hohlraums journal September 2018
Octahedral spherical Hohlraum for Rev. 6 NIF beryllium capsule journal October 2018
Review of hydro-instability experiments with alternate capsule supports in indirect-drive implosions on the National Ignition Facility journal July 2018
Note: New method for high-space-resolving hotspot electron temperature measurements on Shenguang-III prototype journal September 2018
Stimulated backscatter of laser light from BigFoot hohlraums on the National Ignition Facility journal January 2019
Approaching a burning plasma on the NIF journal May 2019
Maintaining low-mode symmetry control with extended pulse shapes for lower-adiabat Bigfoot implosions on the National Ignition Facility journal November 2019
Indirect drive ignition at the National Ignition Facility journal October 2016
Dynamic high energy density plasma environments at the National Ignition Facility for nuclear science research journal February 2018
Capsule modeling of high foot implosion experiments on the National Ignition Facility journal March 2017
Beyond alpha-heating: driving inertially confined fusion implosions toward a burning-plasma state on the National Ignition Facility journal November 2018
Compression and burning of a direct-driven thermonuclear target under the conditions of inhomogeneous heating by a multi-beam megajoule laser journal January 2019
Modeling and projecting implosion performance for the National Ignition Facility journal December 2018
The National Direct-Drive Inertial Confinement Fusion Program journal December 2018
A 3D dynamic model to assess the impacts of low-mode asymmetry, aneurysms and mix-induced radiative loss on capsule performance across inertial confinement fusion platforms journal December 2018
Thermonuclear fusion triggered by collapsing standing whistler waves in magnetized overdense plasmas journal January 2020
X-ray scattering measurements on imploding CH spheres at the National Ignition Facility journal July 2016
Experimental demonstration of low laser-plasma instabilities in gas-filled spherical hohlraums at laser injection angle designed for ignition target journal March 2017
First Octahedral Spherical Hohlraum Energetics Experiment at the SGIII Laser Facility journal April 2018

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