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Title: Polar-direct-drive experiments on the National Ignition Facility

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4920958· OSTI ID:22410404

To support direct-drive inertial confinement fusion experiments at the National Ignition Facility (NIF) [G. H. Miller, E. I. Moses, and C. R. Wuest, Opt. Eng. 43, 2841 (2004)] in its indirect-drive beam configuration, the polar-direct-drive (PDD) concept [S. Skupsky et al., Phys. Plasmas 11, 2763 (2004)] has been proposed. Ignition in PDD geometry requires direct-drive–specific beam smoothing, phase plates, and repointing the NIF beams toward the equator to ensure symmetric target irradiation. First experiments to study the energetics and preheat in PDD implosions at the NIF have been performed. These experiments utilize the NIF in its current configuration, including beam geometry, phase plates, and beam smoothing. Room-temperature, 2.2-mm-diam plastic shells filled with D{sub 2} gas were imploded with total drive energies ranging from ∼500 to 750 kJ with peak powers of 120 to 180 TW and peak on-target irradiances at the initial target radius from 8 × 10{sup 14} to 1.2 × 10{sup 15 }W/cm{sup 2}. Results from these initial experiments are presented, including measurements of shell trajectory, implosion symmetry, and the level of hot-electron preheat in plastic and Si ablators. Experiments are simulated with the 2-D hydrodynamics code DRACO including a full 3-D ray-trace to model oblique beams, and models for nonlocal electron transport and cross-beam energy transport (CBET). These simulations indicate that CBET affects the shell symmetry and leads to a loss of energy imparted onto the shell, consistent with the experimental data.

OSTI ID:
22410404
Journal Information:
Physics of Plasmas, Vol. 22, Issue 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
Country of Publication:
United States
Language:
English

References (59)

Parametric plasmon-photon interactions journal June 1966
SPECT3D – A multi-dimensional collisional-radiative code for generating diagnostic signatures based on hydrodynamics and PIC simulation output journal May 2007
Initial performance results of the OMEGA laser system journal January 1997
Direct drive double shell target implosion hydrodynamics on OMEGA journal June 2005
Laser Compression of Matter to Super-High Densities: Thermonuclear (CTR) Applications journal September 1972
Polar-direct-drive experiments on OMEGA journal June 2006
Three-dimensional HYDRA simulations of National Ignition Facility targets journal May 2001
Polar direct drive on the National Ignition Facility journal May 2004
Two-dimensional simulations of plastic-shell, direct-drive implosions on OMEGA journal March 2005
Polar-direct-drive simulations and experiments journal May 2006
Gated x-ray detector for the National Ignition Facility journal October 2006
Dynamic Hohlraums as x-ray sources in high-energy density science journal January 2008
Progress in direct-drive inertial confinement fusion journal May 2008
Polar-drive designs for optimizing neutron yields on the National Ignition Facility journal August 2008
Two-plasmon-decay instability in direct-drive inertial confinement fusion experiments journal May 2009
Measuring symmetry of implosions in cryogenic Hohlraums at the NIF using gated x-ray detectors (invited) journal October 2010
Backscatter measurements for NIF ignition targets (invited) journal October 2010
The National Ignition Facility neutron time-of-flight system and its initial performance (invited) journal October 2010
Triple-picket warm plastic-shell implosions on OMEGA journal January 2011
Point design targets, specifications, and requirements for the 2010 ignition campaign on the National Ignition Facility journal May 2011
Fast-electron generation in long-scale-length plasmas journal January 2012
The dynamics of hot-electron heating in direct-drive-implosion experiments caused by two-plasmon-decay instability journal February 2012
A polar-drive–ignition design for the National Ignition Facility journal May 2012
Reduction of laser imprinting using polarization smoothing on a solid-state fusion laser journal April 1999
Crossed-beam energy transfer in direct-drive implosions journal May 2012
Charged-particle spectroscopy for diagnosing shock ρR and strength in NIF implosions journal October 2012
Experimental reduction of laser imprinting and Rayleigh–Taylor growth in spherically compressed, medium-Z-doped plastic targets journal June 2012
A novel particle time of flight diagnostic for measurements of shock- and compression-bang times in D 3 He and DT implosions at the NIF journal October 2012
Shell trajectory measurements from direct-drive implosion experiments journal October 2012
Polar-drive implosions on OMEGA and the National Ignition Facility journal May 2013
Measured hot-electron intensity thresholds quantified by a two-plasmon-decay resonant common-wave gain in various experimental configurations journal May 2013
Development of a polar direct-drive platform for studying inertial confinement fusion implosion mix on the National Ignition Facility journal May 2013
Improving cryogenic deuterium–tritium implosion performance on OMEGA journal May 2013
Mitigation of two-plasmon decay in direct-drive inertial confinement fusion through the manipulation of ion-acoustic and Langmuir wave damping journal May 2013
Measurements of the divergence of fast electrons in laser-irradiated spherical targets journal September 2013
Hydrodynamic instability growth and mix experiments at the National Ignition Facility journal May 2014
Improving the hot-spot pressure and demonstrating ignition hydrodynamic equivalence in cryogenic deuterium–tritium implosions on OMEGA journal May 2014
Multiple-beam laser–plasma interactions in inertial confinement fusion journal May 2014
Time-resolved measurements of the hot-electron population in ignition-scale experiments on the National Ignition Facility (invited) journal November 2014
Theory and simulation of stimulated Brillouin scatter excited by nonabsorbed light in laser fusion systems journal January 1981
On the inhomogeneous two-plasmon instability journal January 1983
Design and modeling of ignition targets for the National Ignition Facility journal June 1995
Laser–plasma interactions in ignition‐scale hohlraum plasmas journal May 1996
Laser–plasma interactions in direct-drive ignition plasmas journal November 2012
The Physics of Inertial Fusion book January 2004
Demonstration of the Highest Deuterium-Tritium Areal Density Using Multiple-Picket Cryogenic Designs on OMEGA journal April 2010
Increasing Hydrodynamic Efficiency by Reducing Cross-Beam Energy Transfer in Direct-Drive-Implosion Experiments journal March 2012
Direct Measurement of Energetic Electrons Coupling to an Imploding Low-Adiabat Inertial Confinement Fusion Capsule journal March 2012
Saturation of the Two-Plasmon Decay Instability in Long-Scale-Length Plasmas Relevant to Direct-Drive Inertial Confinement Fusion journal April 2012
Experimental Validation of the Two-Plasmon-Decay Common-Wave Process journal October 2012
Demonstration of the Improved Rocket Efficiency in Direct-Drive Implosions Using Different Ablator Materials journal December 2013
Rayleigh-Taylor Instability and Laser-Pellet Fusion journal September 1974
The National Ignition Facility journal December 2004
NIF final optics system: frequency conversion and beam conditioning
  • Wegner, Paul J.; Auerbach, Jerome M.; Biesiada, Jr., Thomas A.
  • Lasers and Applications in Science and Engineering, SPIE Proceedings https://doi.org/10.1117/12.538481
conference May 2004
National Ignition Facility laser performance status journal January 2007
Performance of 1-THz-bandwidth, two-dimensional smoothing by spectral dispersion and polarization smoothing of high-power, solid-state laser beams journal January 2005
Electron-beam–deposited distributed polarization rotator for high-power laser applications journal January 2014
The National Ignition Facility conference May 2004
Energy Deposition in Laser-Heated Plasmas journal November 1976

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