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Title: Enhanced energy coupling for indirectly driven inertial confinement fusion

Journal Article · · Nature Physics

The indirect drive scheme for inertial confinement fusion (ICF) employs x-rays generated within a high-Z cavity (hohlraum) to implode an embedded low-Z capsule filled with deuterium- tritium (DT) fuel to reach the high density and temperature required for thermonuclear burn. Recently, several cylinder hohlraum experiments on the National Ignition Facility (NIF) have reached the alpha-heating regime [1] where the self-heating by fusion products becomes dominant, producing neutron yields above 1 1016 [2{ 4]. However, there are still challenges on the path towards ignition, such as symmetry control, instability minimization and engineering feature mitigation [5]. Energy coupling from a cylindrical hohlraum to the capsule is typically less than 10%, or 150 kJ for a 1.9 MJ laser drive [1], thereby limiting the energy available in the final hot spot for fusion. Here we report the first experiment on NIF demonstrating 30% energy coupling to an Al capsule in a rugby-shaped Au hohlraum [6]. This high coupling efficiency can substantially enhance the performance margin and improve the prospects for ignition, both in mainline single- shell hot-spot designs and potential double-shell targets.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001; AC52-07NA27344
OSTI ID:
1507330
Alternate ID(s):
OSTI ID: 1491646
Report Number(s):
LA-UR-18-21219; LLNL-JRNL-745363
Journal Information:
Nature Physics, Vol. 15, Issue 2; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

References (31)

Exploring the limits of case-to-capsule ratio, pulse length, and picket energy for symmetric hohlraum drive on the National Ignition Facility Laser journal May 2018
X-ray area backlighter development at the National Ignition Facility (invited) journal November 2014
Extracting core shape from x-ray images at the National Ignition Facility journal October 2012
Review of the National Ignition Campaign 2009-2012 journal February 2014
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
An indirect-drive non-cryogenic double-shell path to 1ω Nd-laser hybrid inertial fusion–fission energy journal August 2010
X-ray streak camera cathode development and timing accuracy of the 4ω ultraviolet fiducial system at the National Ignition Facility journal October 2012
Fusion Energy Output Greater than the Kinetic Energy of an Imploding Shell at the National Ignition Facility journal June 2018
Inertial-confinement fusion with lasers journal May 2016
Streaked radiography measurements of convergent ablator performance (invited) journal October 2010
The Physics of Inertial Fusion book January 2004
Advances in NLTE modeling for integrated simulations journal January 2010
Laser Compression of Matter to Super-High Densities: Thermonuclear (CTR) Applications journal September 1972
The National Ignition Facility journal December 2004
Dante soft x-ray power diagnostic for National Ignition Facility journal October 2004
2D X-Ray Radiography of Imploding Capsules at the National Ignition Facility journal May 2014
Ignition scaling laws and their application to capsule design journal May 2001
Hohlraum-Driven Mid- Z ( SiO 2 ) Double-Shell Implosions on the Omega Laser Facility and Their Scaling to NIF journal October 2009
Demonstration of High Performance in Layered Deuterium-Tritium Capsule Implosions in Uranium Hohlraums at the National Ignition Facility journal July 2015
Development of the indirect‐drive approach to inertial confinement fusion and the target physics basis for ignition and gain journal November 1995
Progress toward Ignition with Noncryogenic Double-Shell Capsules journal May 2000
Detailed diagnosis of a double-shell collision under realistic implosion conditions journal May 2006
Inertially confined fusion plasmas dominated by alpha-particle self-heating journal April 2016
Developing one-dimensional implosions for inertial confinement fusion science journal January 2016
Hohlraum-Driven Ignitionlike Double-Shell Implosions on the Omega Laser Facility journal February 2005
Progress towards a more predictive model for hohlraum radiation drive and symmetry journal May 2017
Rugby-like hohlraum experimental designs for demonstrating x-ray drive enhancement journal January 2008
Assessing the prospects for achieving double-shell ignition on the National Ignition Facility using vacuum hohlraums journal May 2007
Progress in hohlraum physics for the National Ignition Facility journal May 2014
The National Ignition Facility conference May 2004

Cited By (5)

Experimental study of energy transfer in double shell implosions journal May 2019
The blind implosion-maker: Automated inertial confinement fusion experiment design journal June 2019
Ultra-high (>30%) coupling efficiency designs for demonstrating central hot-spot ignition on the National Ignition Facility using a Frustraum journal August 2019
Suppression of parametric instabilities in inhomogeneous plasma with multi-frequency light journal October 2019
The Blind Implosion-Maker - Automated Inertial Confinement Fusion experiment design text January 2019

Figures / Tables (6)


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