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Title: Increasing stagnation pressure and thermonuclear performance of inertial confinement fusion capsules by the introduction of a high-Z dopant

Journal Article · · Physics of Plasmas
DOI: https://doi.org/10.1063/1.5033459 · OSTI ID:1557044

Inertial confinement fusion requires the inertia of the imploding mass to provide the necessary confinement such that the core reaches adequate high density, temperature, and pressure. Studies utilize low-Z capsules filled with hydrogenic fuel, which are subject to multiple instabilities at the interfaces during the implosion. To improve the stability of the fuel:capsule interface and narrow the imploding shell profile, capsules are doped with a small atomic percentage of a high-Z material. A series of recent indirect-drive experiments executed at the National Ignition Facility with tungsten-doped high density carbon capsules has demonstrated that the presence of this dopant serves to increase the in-flight aspect ratio of the shell and increase the compression and neutron yield performance of both gas-filled and deuterium-tritium cryogenically layered targets. These experiments definitively show that benefits accrued by the introduction of a high-Z dopant into the capsule can outweigh the detrimentally reduced stability of the ablation front, avoiding shell breakup or significant radiative cooling of the hot spot. Future experiments will utilize these types of capsules to additionally increase nuclear performance.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; NA0001808
OSTI ID:
1557044
Alternate ID(s):
OSTI ID: 1466869
Report Number(s):
LLNL-JRNL--740802; 894254
Journal Information:
Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 25; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (33)

Tent-induced perturbations on areal density of implosions at the National Ignition Facilitya) journal May 2015
Fuel gain exceeding unity in an inertially confined fusion implosion journal February 2014
2D X-Ray Radiography of Imploding Capsules at the National Ignition Facility journal May 2014
Symmetry control of an indirectly driven high-density-carbon implosion at high convergence and high velocity journal May 2017
Point design targets, specifications, and requirements for the 2010 ignition campaign on the National Ignition Facility journal May 2011
Increasing robustness of indirect drive capsule designs against short wavelength hydrodynamic instabilities journal May 2005
Erratum: “Review of the National Ignition Campaign 2009-2012” [Phys. Plasmas 21, 020501 (2014)] journal December 2014
The near vacuum hohlraum campaign at the NIF: A new approach journal May 2016
X-ray shadow imprint of hydrodynamic instabilities on the surface of inertial confinement fusion capsules by the fuel fill tube journal March 2017
Hot-Spot Mix in Ignition-Scale Inertial Confinement Fusion Targets journal July 2013
Design and modeling of ignition targets for the National Ignition Facility journal June 1995
Diamond spheres for inertial confinement fusion journal September 2009
Mitigating Laser Imprint in Direct-Drive Inertial Confinement Fusion Implosions with High- Z Dopants journal May 2012
Three-dimensional HYDRA simulations of National Ignition Facility targets journal May 2001
Near-vacuum hohlraums for driving fusion implosions with high density carbon ablatorsa) journal May 2015
First High-Convergence Cryogenic Implosion in a Near-Vacuum Hohlraum journal April 2015
Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition Facility journal March 2016
Symmetry tuning for ignition capsules via the symcap technique journal May 2011
The Physics of Inertial Fusion book January 2004
Controlled incorporation of mid-to-high Z transition metals in CVD diamond journal May 2010
Preheat Effects on Shock Propagation in Indirect-Drive Inertial Confinement Fusion Ablator Materials journal December 2003
Effects of variable x‐ray preheat shielding in indirectly driven implosions journal May 1996
Theory of hydro-equivalent ignition for inertial fusion and its applications to OMEGA and the National Ignition Facility journal May 2014
Experimental reduction of laser imprinting and Rayleigh–Taylor growth in spherically compressed, medium-Z-doped plastic targets journal June 2012
The physics issues that determine inertial confinement fusion target gain and driver requirements: A tutorial journal May 1999
First Measurements of Fuel-Ablator Interface Instability Growth in Inertial Confinement Fusion Implosions on the National Ignition Facility journal August 2016
Progress in hohlraum physics for the National Ignition Facility journal May 2014
Neutron spectrometry—An essential tool for diagnosing implosions at the National Ignition Facility (invited) journal October 2012
Zinc Oxide–Coated Poly(HIPE) Annular Liners to Advance Laser Indirect Drive Inertial Confinement Fusion journal November 2017
Implosion configurations for robust ignition using high- density carbon (diamond) ablator for indirect-drive ICF at the National Ignition Facility journal May 2016
High-mode Rayleigh-Taylor growth in NIF ignition capsules journal June 2010
The National Ignition Facility: enabling fusion ignition for the 21st century journal November 2004
Fusion Energy Output Greater than the Kinetic Energy of an Imploding Shell at the National Ignition Facility journal June 2018

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