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1-MJ, Wetted-Foam Target-Design Performance for the National Ignition Facility 48th Annual Meeting of the American Physical Society Division of Plasma Physics

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Published by , 2017-01-13 08:15:03

1-MJ, Wetted-Foam Target-Design Performance for the ...

1-MJ, Wetted-Foam Target-Design Performance for the National Ignition Facility 48th Annual Meeting of the American Physical Society Division of Plasma Physics

Modes , > 100 contribute neg
the ice roughness at the end

SNTJNQSJOU ON
• Modes feed through to the inner s
• The resulting ice spectrum at the

by modes , < 100, with over 99%

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BUTUBSUPGESJWFQVMTF






5)[44%


.PEFOVNCFS
TC7465

gligibly to
d of acceleration

surface, attenuated by exp(–kDR).
e end of acceleration is dominated

of the rms due to these modes.

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FOEPGBDDFMFSBUJPO



"NQMJUVEF nN
m

m

m

m


.PEF

*V. Goncharov et al., Phys. Plasmas 7, 2962 (2000).

vSNT1-D SSD asymptotes much s

• SSD smoothes efficiently do
,min = 2rR0 /]2FDig~ 4, whe
Di2 = Di12 + Di22 is the effec
• 1-D SSD smoothes at the sa

much earlier than 2-D SSD.
m

*OUFHSBUFE%44%
DPTJOFBNQMJUVEFNPEFM
m

%44%NPEFM

m m m
m

5JNF OT


4NPPUIJOHGPS,

TC7646

vSNTsooner than 2-D SSD

own to a mode number of
ere F is the focal length and
ctive far-field divergence.
ame rate, but asymptotes

m

m


.PEFOVNCFS
4NPPUIJOHGPS,UP

BUOT

A completed 2-D simulation w
and an ice power-law index o

• Integrated simulations include imp
nonuniformity (370-nm rms), and 1

• An ice power-law index of b = 1 is
from DT-ice layers at LLE.


[ nN








S nN


• Rhot spot = ~35 nm, neutron-averag

TC7660

with 2-D, 1-THz SSD,
of 1 produced a gain of 27

print, power imbalance, foam-surface
1-nm initial ice roughness.
used, determined experimentally

%FOTJUZ Near peak
HDNm
compression








ged fuel areal density = 1.32 g cm–2.

The pulse shape is within the
of NIF pulse-shaping capabil

• Pulses on the NIF are decomp
impulses and filtered with a 1-

1PXFS 58
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5



TC7466

e limits
lities

posed into a series of Gaussian
-GHz, low-pass filter.

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5JNF OT

4VNJORVBESBUVSF Nonuniformities: Power Imbalance
PGNPEFTUP

Beam-to-beam imbalance im
perturbations on the target

• Beam port locations contribu
• Beam-to-beam imbalance is d

with an amplitude of ~1%.
• Beam mistiming contributes

primarily during the picket.



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"MTPJODMVEJOHNJTUJNJOH






5JNF OT


TC7158a

mposes long-wavelength

ute a perturbation of ~1% in , = 6.
dominated by modes , = 2 to 12,
~5 to 15% in modes , = 1 to 3,

"JUPGGQSPKFDUJPO

m
0OUBSHFUQFSUVSCBUJPO


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