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Title: Double-Pulse Laser-Driven Jets on OMEGA

Abstract

A double-pulse laser drive is used to create episodic supersonic plasma jets that propagate into a low density ambient medium. These are among the first laser experiments to generate pulsed outflow. Detailed comparisons between single- and double-pulsed jet rheology and shock structure are presented. 2-D hydrodynamic simulations are compared to the experimental radiographs.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Laboratory for Laser Energetics, University of Rochester
Sponsoring Org.:
USDOE
OSTI Identifier:
901271
Report Number(s):
DOE/SF/19460-732
1693; 2005-197; TRN: US200722%%95
DOE Contract Number:
FC52-92SF19460
Resource Type:
Conference
Resource Relation:
Journal Name: Astrophysics and Space Science; Journal Volume: 307; Conference: 6th International Conference on High Energy Density Laboratory Astrophysics, Houston, TX, 11-14 March 2006
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ASTROPHYSICS; ENERGY DENSITY; HYDRODYNAMICS; LASERS; PLASMA JETS; RHEOLOGY; PULSES; laser experiments; plasma jet; episodic outflow

Citation Formats

Sublett, S., Knauer, J.P., Igumenshchev, I.V., Frank, A., and Meyerhofer, D.D. Double-Pulse Laser-Driven Jets on OMEGA. United States: N. p., 2007. Web. doi:10.1007/s10509-006-9206-9.
Sublett, S., Knauer, J.P., Igumenshchev, I.V., Frank, A., & Meyerhofer, D.D. Double-Pulse Laser-Driven Jets on OMEGA. United States. doi:10.1007/s10509-006-9206-9.
Sublett, S., Knauer, J.P., Igumenshchev, I.V., Frank, A., and Meyerhofer, D.D. Fri . "Double-Pulse Laser-Driven Jets on OMEGA". United States. doi:10.1007/s10509-006-9206-9.
@article{osti_901271,
title = {Double-Pulse Laser-Driven Jets on OMEGA},
author = {Sublett, S. and Knauer, J.P. and Igumenshchev, I.V. and Frank, A. and Meyerhofer, D.D.},
abstractNote = {A double-pulse laser drive is used to create episodic supersonic plasma jets that propagate into a low density ambient medium. These are among the first laser experiments to generate pulsed outflow. Detailed comparisons between single- and double-pulsed jet rheology and shock structure are presented. 2-D hydrodynamic simulations are compared to the experimental radiographs.},
doi = {10.1007/s10509-006-9206-9},
journal = {Astrophysics and Space Science},
number = ,
volume = 307,
place = {United States},
year = {Fri Mar 23 00:00:00 EDT 2007},
month = {Fri Mar 23 00:00:00 EDT 2007}
}

Conference:
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  • An experimental campaign to study hohlraum-driven ignition-like double-shell target performance using the Omega laser facility has begun. These targets are intended to incorporate as many ignition-like properties of the proposed National Ignition Facility (NIF) double-shell ignition design [1,2] as possible, given the energy constraints of the Omega laser. In particular, this latest generation of Omega double-shells is nominally predicted to produce over 99% of the (clean) DD neutron yield from the compressional or stagnation phase of the implosion as required in the NIF ignition design. By contrast, previous double-shell experience on Omega [3] was restricted to cases where a significantmore » fraction of the observed neutron yield was produced during the earlier shock convergence phase where the effects of mix are deemed negligibly small. These new targets are specifically designed to have optimized fall-line behavior for mitigating the effects of pusher-fuel mix after deceleration onset and, thereby, providing maximum neutron yield from the stagnation phase. Experimental results from this recent Omega ignition-like double-shell implosion campaign show favorable agreement with two-dimensional integrated hohlraum simulation studies when enhanced (gold) hohlraum M-band (2-5 keV) radiation is included at a level consistent with observations.« less
  • High-convergence ignition-like double-shell implosion experiments have been performed on the Omega laser facility [T.R. Boehly et al., Opt. Commun. 133, 495 (1997)] using cylindrical gold hohlraums with 40 drive beams. Repeatable, dominant primary (2.45 MeV) neutron production from the mix-susceptible compressional phase of a double-shell implosion, using fall-line design optimization and exacting fabrication standards, is experimentally inferred from time-resolved core x-ray imaging. Effective control of fuel-pusher mix during final compression is essential for achieving noncryogenic ignition with double-shell targets on the National Ignition Facility [Paisner et al., Laser Focus World 30, 75 (1994)].
  • High-convergence ignitionlike double-shell implosion experiments have been performed on the Omega laser facility using cylindrical gold hohlraums with 40 drive beams. Repeatable, dominant primary (2.45 MeV) neutron production from the mix-susceptible compressional phase of a double-shell implosion, using fall-line design optimization and exacting fabrication standards, is experimentally inferred from time-resolved core x-ray imaging. Effective control of fuel-pusher mix during final compression is essential for achieving noncryogenic ignition with double-shell targets on the National Ignition Facility.
  • High-convergence ignition-like double-shell implosion experiments have been performed on the Omega laser facility [T.R. Boehly et al., Opt. Commun. 133, 495 (1997)] using cylindrical gold hohlraums with 40 drive beams. For the first time, repeatable, dominant primary (2.45 MeV) neutron production from the mix-susceptible compressional phase of a double-shell implosion, using fall-line design optimization and exacting fabrication standards, is demonstrated. Effective control of fuel-pusher mix during final compression is essential for achieving noncryogenic ignition with double-shell targets on the National Ignition Facility [Paisner et al., Laser Focus World 30, 75 (1994)].
  • High-convergence, hohlraum-driven implosions of double-shell capsules using mid-Z (SiO{sub 2}) inner shells have been performed on the OMEGA laser facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. These experiments provide an essential extension of the results of previous low-Z (CH) double-shell implosions [P. A. Amendt et al., Phys. Rev. Lett. 94, 065004 (2005)] to materials of higher density and atomic number. Analytic modeling, supported by highly resolved 2D numerical simulations, is used to account for the yield degradation due to interfacial atomic mixing. This extended experimental database from OMEGA enables a validation of the mix model, andmore » provides a means for quantitatively assessing the prospects for high-Z double-shell implosions on the National Ignition Facility [Paisner et al., Laser Focus World 30, 75 (1994)].« less