HAPL Target Physics: a Stability of the Baseline b Future Target Options

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HAPL Target Physics (a) Stability of the
Baseline (b) Future Target Options

• L. J. Perkins, M. Tabak, C. Bibeau (LLNL)
• R. Betti, C. Zhou (University of Rochester)
• High Average Power Laser Program Meeting
• Oak Ridge National Laboratory, November 8, 2006

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350MJ-Class HAPL Baseline Target
IFARs _at_ 2/3r031, CRs33, Vmax2.9e7cm/s,
?abl3.6 _at_ 2/3r0, ?fuel1.21 _at_ max KE
http//aries.ucsd.edu/HAPL/DOCS/
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Target Gain Curves
KrF a90.6, b0.138 DPSSL at 3? a67.8,
b0.210
http//aries.ucsd.edu/HAPL/DOCS/
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Stability Single Mode 2D Growth Factors
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Stability Progress We Think We Know Why High
Mode Numbers (short ?) are Hard to Model
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Stability Progress Problem Seems to be Chevron
Modes (4-5th harmonics) Driven by Zone-Popping
Fourier Decomposition of Ablation Front
Amplitude l150, No Picket
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HAPL - High Average Power Laser
ProgramPoint-of-Departure Reactor Design
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Candidate Advanced Targets for Laser IFE
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Can Advanced Targets Lead to Smaller, Less
Complex Reactor Configurations?
Preliminary configuration
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Shock IgnitionDecouple the Compression from
Ignition
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Following Indirect-Drive Ignition, Shock
Ignited Targets on NIF Offer the Potential for.
The Value of HAPL Target Physics to DOE NIF/NNSA
Programs
? A high yield, reactor-relevant target
200MJ _at_ 1MJ drive (?1200MWth/500MWe if
rep-rated at 6Hz)
? High yield targets for SSP applications
See associated VGs for specifics
? High gain targets at low drive energy
Gain 50 _at_ 150kJ drive (?10MJ-yield class)
? Non-cryo, simple (single shell) high pressure
gas targets Gain unity _at_ 1MJ with
central ignition
On a separate, rep-rated, high-average-fusion-po
wer facility
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Shock Ignition for HAPL High Gain at Low Drive
Energy
( to scale )
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Advanced Targets Critical RD Issues
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How do we Accommodate Shock Ignited Targets in
the NIF Experimental Plan?
? What limits NIF maximum power?
B-integral in main amplifier, freq convertor?
600TW needed, 11/9 limits may be
gt700TW. But only need 1MJ
? What front-end changes are required?
Present risetimes gt200ps 100-150ps needed cost
10M?
? 3? phase plates for polar direct drive?
Spot sizes are 3mm (level-3 milestone for
definition in Sept 06)
? SSD smoothing and bandwidth requirements?
nb smoothing not required for high intensity
shock spike
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HAPL Direct Drive Target Draft Laser/Target
Specs Nov 05
Sources J.Perkins HAPL w/shop presentations UCLA
(June 2004), PPPL (Oct 2004) D.Eimeral
Configuring the NIF for Direct Drive
UCRL-ID-120758 LLNL (1995) R.McCrory NIF
Direct-Drive Ignition Plan plus briefing VGs
(April 1999) LLE Reviews 98 p67, 79 p121, 84
181. S.Skupsky(LLE) pvte comm. (May 2005)
NIF indirect drive specs 12nm (CH), 33nm
(Be/Cu), 0.5mm (inner ice lgt10)
http//aries.ucsd.edu/HAPL/DOCS/