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T. R. Boehly University of Rochester Laboratory for Laser Energetics 52nd Annual Meeting of the American Physical Society Division of Plasma Physics Chicago, IL 8–12 November 2010 Shock-Timing Measurements in Spherical Targets Filled with Liquid Deuterium VISAR data: Four spherical shock waves 1st shock 2nd 3rd 4th 0 1 2 Time (ns) 3 S59819 100 0 100 Distance (nm) Capsule/cone detail

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Page 1: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

T. R. BoehlyUniversity of RochesterLaboratory for Laser Energetics

52nd Annual Meeting of theAmerican Physical SocietyDivision of Plasma Physics

Chicago, IL8–12 November 2010

Shock-Timing Measurements in Spherical Targets Filled with Liquid Deuterium

VISAR data: Four spherical shock waves

1st shock 2nd 3rd 4th

0 1 2Time (ns)

3

S59819

100

0

100

Dis

tan

ce (n

m)

Capsule/cone detail

Page 2: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

E19386

Summary

Precision shock-timing measurements in cryogenic spherical targets are used to tune ICF target designs

• High-performanceICFtargetsrequireprecisetimingofmultipleshockwaves to condition the capsule for implosion

•Theseshocksaretimedbymeasuringvelocitiesandcoalescencetimes in cryogenic cone-in-shell targets

•Measurementsoffoursphericallyconvergingshockswereobtained on OMEGA

•Simulationsaccuratelypredicttheshockvelocityandtimingwhen nonlocal thermal transport is included

•Thistechniquewillbeappliedtofull-scaleNIFexperimentstotune pulse shapes for ignition targets

Page 3: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

Collaborators

V.N.Goncharov,W.Seka,M.A.Barrios,D.E.Fratanduono,S.X.Hu, T. J. B. Collins, J. A. Marozas, T. C. Sangster, and D. D. Meyerhofer

University of RochesterLaboratory for Laser Energetics

P.M.Celliers,D.Munro,D.G.Hicks,H.F.Robey,andG.W.CollinsLawrence Livermore National Laboratory

Page 4: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

The timing of multiple convergent shocks is studied using directly driven spheres with re-entrant cones

E16636j

36 beamson sphere Au

cone

LiquidD2

Cryostat

CDshell

Capsule/cone detail

Streakcamera

SOP2

Image plane

VISAR1

Streakcamera

1Velocity interferometer system for any reflector2Streaked optical pyrometer

Page 5: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

Triple-pulse irradiation produces three shock waves that are readily diagnosed with VISAR and SOP

S59533E19388

0 1 2 3Time (ns)

4 5

0 1 2 3 4 5

VISARVISAR

SOPSOP

1st shock100

0

100Dis

tan

ce (n

m)

100

0

100

Dis

tan

ce (n

m)

2nd 3rd shock

Coalescence

Sphericalconvergence

Page 6: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

By adjusting the strength or timing of the laser pulses, the shock merger times can be controlled

S59533S59534E19463

0 1 2 3 4 5

0 1 2 3 4 5

100

0

100Dis

tan

ce (n

m)

S59533

1st shock 2nd 3rd shock

Increase third pulse; merger occurs earlier

2nd

S59534

Time (ns)

1st shock 3rd shock

100

0

100Dis

tan

ce (n

m)

Page 7: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

A nonlocal-transport model better simulates shock velocitiesthanaflux-limitermodel

S59529E19392

Nonlocal model is more consistent with acceleration, absorption,andscattered-lightexperiments.

V. N. Goncharov (Q13.0001)

0

20

40

0.0 0.5 1.0 1.5Time (ns)

Two-shock data

2.0 2.5 3.0

60

80

Vel

oci

ty (n

m/n

s) First shock

Second shock

VISAR dataFlux limiter(f = 0.06)

Nonlocal

Page 8: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

Three-shockexperimentsarewellmodeledbysimulations, including convergence effects

S59533E19393

0

20

40

0 1 2 3Time (ns)

10-nm CH shell6000

5000

4000

3000

2000

1000

04 5 6

60

80

100

Vel

oci

ty (n

m/n

s)

SO

P c

ou

nts

Acceleration dueto convergence

Simulation

VISAR

SOP

This agreement is approaching the required ±50-ps accuracy.

Page 9: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

Experimentswith5-nmCHshellsarewellmodeled,indicating adequate treatment of D2 ablation plasma

E19394

0

20

40

0 1 2 3Time (ns)

4 5

60

80

Vel

oci

ty (n

m/n

s)

SOP

6000

5000

4000

3000

2000

1000

0

SO

P c

ou

nts

Simulation

VISAR

Page 10: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

Four shocks were observed using an ICF pulse with a main-drive pulse

S59819E19473

1st shock 2nd 3rd 4th

0 1 2Time (ns)

3

4th shock mergesbefore main pulse blanks window

S59819

100

0

100Dis

tan

ce (n

m)

Page 11: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

Four shocks and three mergers were observed from a full OMEGA ICF pulse, including velocities of ~140 km/s

E19512

0

50

0.0 0.5 1.5 2.5Time (ns)

1.0 2.0 3.0 3.5

100

150

Vel

oci

ty (n

m/n

s)

12000

SOP

10000

8000

6000

4000

2000

0

SO

P c

ou

ntsSimulation

VISAR

Page 12: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

Shock timing on the NIF will be performed with cone-in-shell targets inside ignition-size hohlraums

E19399

Page 13: Shock-Timing Measurements in Spherical Targets Filled with ......• High-performance ICF targets require precise timing of multiple shock waves to condition the capsule for implosion

E19386

Summary/Conclusions

Precision shock-timing measurements in cryogenic spherical targets are used to tune ICF target designs

• High-performanceICFtargetsrequireprecisetimingofmultipleshockwaves to condition the capsule for implosion

•Theseshocksaretimedbymeasuringvelocitiesandcoalescencetimes in cryogenic cone-in-shell targets

•Measurementsoffoursphericallyconvergingshockswereobtained on OMEGA

•Simulationsaccuratelypredicttheshockvelocityandtimingwhen nonlocal thermal transport is included

•Thistechniquewillbeappliedtofull-scaleNIFexperimentstotune pulse shapes for ignition targets


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