51st Annual Meeting of the APS Division of Plasma Physics
Volume 54, Number 15
Monday–Friday, November 2–6, 2009;
Atlanta, Georgia
Session NI2: ICF Capsules and Rayleigh-Taylor Instability
9:30 AM–12:30 PM,
Wednesday, November 4, 2009
Room: Centennial I
Chair: David Meyerhofer, University of Rochester
Abstract ID: BAPS.2009.DPP.NI2.1
Abstract: NI2.00001 : Capsule Performance Optimization for the National Ignition Facility
9:30 AM–10:00 AM
Preview Abstract
Abstract
Author:
Otto Landen
(Lawrence Livermore National Laboratory)
The overall goal of the capsule performance optimization campaign
is to
maximize the probability of ignition by experimentally correcting
for likely
residual uncertainties in the implosion and hohlraum physics used
in our
radiation-hydrodynamic computational models before proceeding to
cryogenic-layered implosions and ignition attempts. This will be
accomplished using a variety of targets that will set key laser,
hohlraum
and capsule parameters to maximize ignition capsule implosion
velocity,
while minimizing fuel adiabat, core shape asymmetry and
ablator-fuel mix.
The targets include high Z re-emission spheres setting foot
symmetry through
foot cone power balance [1], liquid Deuterium-filled ``keyhole''
targets
setting shock speed and timing through the laser power profile
[2], symmetry
capsules setting peak cone power balance and hohlraum length [3], and
streaked x-ray backlit imploding capsules setting ablator
thickness [4].
We will show how results from successful tuning technique
demonstration
shots performed at the Omega facility under scaled hohlraum and
capsule
conditions relevant to the ignition design meet the required
sensitivity and
accuracy. We will also present estimates of all expected random and
systematic uncertainties in setting the key ignition laser and target
parameters due to residual measurement, calibration, cross-coupling,
surrogacy, and scale-up errors, and show that these get reduced
after a
number of shots and iterations to meet an acceptable level of
residual
uncertainty. Finally, we will present results from upcoming
tuning technique
validation shots performed at NIF at near full-scale.
Prepared by LLNL under Contract DE-AC52-07NA27344.
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[1] E. Dewald, et. al. Rev. Sci. Instrum. 79 (2008) 10E903.
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[2] T.R. Boehly, et. al., Phys. Plasmas 16 (2009) 056302.
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[3] G. Kyrala, et. al., BAPS 53 (2008) 247.
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[4] D. Hicks, et. al., BAPS 53 (2008) 2.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.DPP.NI2.1