skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Time history prediction of direct-drive implosions on the Omega facility

Abstract

We present in this article direct-drive experiments that were carried out on the Omega facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. Two different pulse shapes were tested in order to vary the implosion stability of the same target whose parameters, dimensions and composition, remained the same. The direct-drive configuration on the Omega facility allows the accurate time-resolved measurement of the scattered light. We show that, provided the laser coupling is well controlled, the implosion time history, assessed by the “bang-time” and the shell trajectory measurements, can be predicted. This conclusion is independent on the pulse shape. In contrast, we show that the pulse shape affects the implosion stability, assessed by comparing the target performances between prediction and measurement. For the 1-ns square pulse, the measured neutron number is about 80% of the prediction. For the 2-step 2-ns pulse, we test here that this ratio falls to about 20%.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]; ; ; ; ;  [2];  [3]; ;  [4];  [5]
  1. CEA, DAM, DIF, F-91297 Arpajon (France)
  2. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299 (United States)
  3. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
  4. Physics Department, University of Nevada, Reno, Nevada 89557 (United States)
  5. CEA, CVA, 21120 Is-sur-Tille (France)
Publication Date:
OSTI Identifier:
22493828
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CONFIGURATION; COUPLING; DIRECT DRIVE LASER IMPLOSION; LASERS; NEUTRONS; OMEGA FACILITY; PULSE SHAPERS; PULSES; STABILITY; TIME RESOLUTION; VISIBLE RADIATION

Citation Formats

Laffite, S., Bourgade, J. L., Caillaud, T., Girard, F., Landoas, O., Lemaire, S., Masse, L., Masson-Laborde, P. E., Philippe, F., Reverdin, C., Tassin, V., Delettrez, J. A., Glebov, V. Yu., Marshall, F. J., Michel, D. T., Seka, W., Frenje, J. A., Joshi, T., Mancini, R. C., and Legay, G. Time history prediction of direct-drive implosions on the Omega facility. United States: N. p., 2016. Web. doi:10.1063/1.4939833.
Laffite, S., Bourgade, J. L., Caillaud, T., Girard, F., Landoas, O., Lemaire, S., Masse, L., Masson-Laborde, P. E., Philippe, F., Reverdin, C., Tassin, V., Delettrez, J. A., Glebov, V. Yu., Marshall, F. J., Michel, D. T., Seka, W., Frenje, J. A., Joshi, T., Mancini, R. C., & Legay, G. Time history prediction of direct-drive implosions on the Omega facility. United States. https://doi.org/10.1063/1.4939833
Laffite, S., Bourgade, J. L., Caillaud, T., Girard, F., Landoas, O., Lemaire, S., Masse, L., Masson-Laborde, P. E., Philippe, F., Reverdin, C., Tassin, V., Delettrez, J. A., Glebov, V. Yu., Marshall, F. J., Michel, D. T., Seka, W., Frenje, J. A., Joshi, T., Mancini, R. C., and Legay, G. 2016. "Time history prediction of direct-drive implosions on the Omega facility". United States. https://doi.org/10.1063/1.4939833.
@article{osti_22493828,
title = {Time history prediction of direct-drive implosions on the Omega facility},
author = {Laffite, S. and Bourgade, J. L. and Caillaud, T. and Girard, F. and Landoas, O. and Lemaire, S. and Masse, L. and Masson-Laborde, P. E. and Philippe, F. and Reverdin, C. and Tassin, V. and Delettrez, J. A. and Glebov, V. Yu. and Marshall, F. J. and Michel, D. T. and Seka, W. and Frenje, J. A. and Joshi, T. and Mancini, R. C. and Legay, G.},
abstractNote = {We present in this article direct-drive experiments that were carried out on the Omega facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. Two different pulse shapes were tested in order to vary the implosion stability of the same target whose parameters, dimensions and composition, remained the same. The direct-drive configuration on the Omega facility allows the accurate time-resolved measurement of the scattered light. We show that, provided the laser coupling is well controlled, the implosion time history, assessed by the “bang-time” and the shell trajectory measurements, can be predicted. This conclusion is independent on the pulse shape. In contrast, we show that the pulse shape affects the implosion stability, assessed by comparing the target performances between prediction and measurement. For the 1-ns square pulse, the measured neutron number is about 80% of the prediction. For the 2-step 2-ns pulse, we test here that this ratio falls to about 20%.},
doi = {10.1063/1.4939833},
url = {https://www.osti.gov/biblio/22493828}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 1,
volume = 23,
place = {United States},
year = {Fri Jan 15 00:00:00 EST 2016},
month = {Fri Jan 15 00:00:00 EST 2016}
}

Works referenced in this record:

Measurements of the ablation-front trajectory and low-mode nonuniformity in direct-drive implosions using x-ray self-emission shadowgraphy
journal, January 2015


A nonlocal electron conduction model for multidimensional radiation hydrodynamics codes
journal, January 2000


Modeling hydrodynamic instabilities in inertial confinement fusion targets
journal, December 2000


Core performance and mix in direct-drive spherical implosions with high uniformity
journal, May 2001


Study of direct-drive, deuterium–tritium gas-filled plastic capsule implosions using nuclear diagnostics at OMEGA
journal, November 2001


Rayleigh–Taylor instability in the deceleration phase of spherical implosion experiments
journal, June 2002


Wide-dynamic-range “neutron bang time” detector on OMEGA
journal, November 2002


Improved performance of direct-drive inertial confinement fusion target designs with adiabat shaping using an intensity picket
journal, May 2003


Theory of laser-induced adiabat shaping in inertial fusion implosions: The decaying shock
journal, November 2003


Prototypes of National Ignition Facility neutron time-of-flight detectors tested on OMEGA
journal, October 2004


Multidimensional analysis of direct-drive, plastic-shell implosions on OMEGA
journal, May 2005


Laser absorption, mass ablation rate, and shock heating in direct-drive inertial confinement fusion
journal, May 2007


Time-resolved absorption in cryogenic and room-temperature direct-drive implosions
journal, May 2008


Improved laser‐beam uniformity using the angular dispersion of frequency‐modulated light
journal, October 1989


Triple-picket warm plastic-shell implosions on OMEGA
journal, January 2011


The effects of laser absorption on direct-drive capsule experiments at OMEGA
journal, April 2012


Polarization beam smoothing for inertial confinement fusion
journal, April 2000


Crossed-beam energy transfer in direct-drive implosions
journal, May 2012


Shell trajectory measurements from direct-drive implosion experiments
journal, October 2012


Numerical simulation of thin-shell direct drive DHe3-filled capsules fielded at OMEGA
journal, July 2012


Laser irradiance scaling in polar direct drive implosions on the National Ignition Facility
journal, September 2015


Growth rates of the ablative Rayleigh–Taylor instability in inertial confinement fusion
journal, May 1998


Direct-drive, hollow-shell implosion studies on the 60-beam, UV OMEGA laser system
journal, March 2000


Direct-drive high-convergence-ratio implosion studies on the OMEGA laser system
journal, May 2000


Neutron and photon emission of a high-gain direct-drive target for laser fusion
journal, September 2006


Compression phase study of the HiPER baseline target
journal, January 2008


The Physics of Inertial Fusion
book, January 2004


Increasing Hydrodynamic Efficiency by Reducing Cross-Beam Energy Transfer in Direct-Drive-Implosion Experiments
journal, March 2012


Dependence of Shell Mix on Feedthrough in Direct Drive Inertial Confinement Fusion
journal, May 2004


Works referencing / citing this record: