Time-Resolved Measurement of Optical Self-Emissionfor Shock Wave and Equation of State Studies
J. E. MillerUniversity of RochesterLaboratory for Laser Energetics
46th Annual Meeting of theAmerican Physical SocietyDivision of Plasma Physics
Savannah, GA15–19 November 2004
SOP Shot 32208
0 2 4 6
Dis
tan
ce (µm
)
Time (ns)
–500
0
5001st shock
CoalescenceBreakout
Collaborators
W. J. Armstrong, T. R. Boehly, I. V. Igumenshchev,D. D. Meyerhofer, W. Theobald, and E. Vianello
Laboratory for Laser Energetics, University of Rochester
J. Eggert, D. G. Hicks, and C. Sorce
Lawrence Livermore National Laboratory
E13376
Simulations of cryogenic D2 experiments agree wellwith observations made utilizing the SOP
• The streaked optical pyrometer (SOP) is a time-resolved,self-emission diagnostic1 recently configured to runsimultaneously with VISAR.2
• Spatial and temporal calibration of SOP recordshave been verified with VISAR.
• Temperature measurements using the absolute spectralcalibration are useful in evaluating EOS models.
• Optical self-emission will be a key diagnosticof future shaped-pulse work.
1 J. A. Oertel et al., Rev. Sci. Instrum. 70, 803 (1999).2 Velocity Interferometer System for Any Reflector
Summary
Optical self-emission data are acquired simultaneouslywith shock velocity from VISAR
Mag = 13×DoF ~ 3 mmδx = 7.75 µm
VISAR’s
1 2
OMEGA
SOPf/3.3
E13377
SOP spectral response
1000 2000 30000Wavelength (nm)
100
1
0.01
Sp
ectr
al r
adia
nce
(W/m
m2 /
nm
)
4.5 eV
0.25 eV
E13378
Shock coalescence in multi-shock experimentsis detected in self-emission temporal records
Time (ns)
~3 × 1014 W/cm2
90 ps
500
0
–500
SOP Shot 32217
0 2 4 6
Coalescence
Breakout
Time (ns)
Dis
tan
ce (µm
)
Inte
nsi
ty
0.0 0.5 1.0 1.5 2.0 2.5
23°
48° CH
E13379
The SOP provides excellent shock timing agreementwith VISAR resulting in a reliable measure of 2-D effects
Shot 32217 ShockCoalescence and Breakout
VISARSOP
Coalescence Breakout
3.0 3.5 4.0 4.5 5.0 5.5 6.0
Time (ns)
400
200
0
–400
–200Dis
tan
ce (µm
)
ASBO Shot 32217
SOP Shot 32217
500
0
–500
0 2 4 6
Coalescence
Breakout
Dis
tan
ce (µm
)
Time (ns)
500
0
–500
0 2 4 6
Coalescence
Breakout
Dis
tan
ce (µm
)
E13381
The SOP spectral response was absolutely calibrated*to relate SOP output to brightness temperature
* Using the NIST-Traceable Standard OL-550
100
10
1
0.1SR
(m
ean
AD
U/W
/mm
2 ) 10
8
6
4
2
0
Tem
per
atu
re (
eV)
0.6 0.7 0.8 0.9 0 5000 10000 15000
Wavelength (µm) SOP output (mean ADU)
Filter edge
Phototcathode
Black-Body TemperataureDependence of SOP Output
Spectral Response Functionof the SOP
SOP SOP
Black Body
E13382
Equation of state studies involve the simultaneousmeasurements of reflectivity, shock velocityand self-emission data
10 15 20 25 30 35Shock velocity (µm/ns)
0
2000
4000
6000
8000
0.0
0.1
0.2
0.3
0.4
Ref
lect
ivit
y
SO
P o
utp
ut
(mea
n A
DU
)
∝- Quartz Reflectivity andSOP Output Shock
Strength Dependence
TBB
VISARReflectivity
Velocity
TGB
SOP
Shockat TGB
E13383
The measured shock temperature can be usedto evaluate EOS models of pusher materialsfor shock timing experiments
* G. Kerley, “Equations of State for Composite Materials”,SANL Report KPS 99-4 (1999).
α – Quartz Temperature Shock Strength Dependence7
4
6
5
1
2
Tem
per
atu
re (
eV)
Shock velocity (µm/ns)
20 2515
3 LEOS 2210Kerley*Measured
E13529
Shock coalescence in multi-shock experiments of D2is detected in self-emission temporal records
Time (ns)
~3 × 1014 W/cm2
90 ps
Dis
tan
ce (µm
)
–500
500
0
SOP Shot 36457
0 2 4 6 8
Time (ns)
Coalescence
Inte
nsi
ty
0.0 0.5 1.0 1.5 2.0 2.5
23°
48° Cryo D2
Simulations of cryogenic D2 shock coalescenceagrees well with observations made with the SOP
200
0
–200
ASBO Shot 36457
0 5
E13380
Observed and SimulatedCoalescence Times in Cryogenic D2
ObservedLILAC
Drive-pulse delay (ns)
1.0 1.50.5 2.0 2.5 3.0 3.5 4.0 4.5
Tim
e (n
s)
0
1
2
3
4
5
6
7
Dis
tan
ce (µm
)
500
0
–500
SOP Shot 36457
0 2 4 6 8Time (ns)
Dis
tan
ce (µm
) Coalescence
E13501
The SOP is a potential diagnostic for shock timingstudies of ICF-relevant shaped pulses in D2
SOP temperaturemeasurementscan be made.
Po
wer
Time (ns)
0 1 2 3 4
SOP can beused to inferfoot pulse andcompressionwavecoalescence.
ICF-Relevant Shaped α = 4 Pulse
E13376
Simulations of cryogenic D2 experiments agree wellwith observations made utilizing the SOP
• The streaked optical pyrometer (SOP) is a time-resolved,self-emission diagnostic1 recently configured to runsimultaneously with VISAR.2
• Spatial and temporal calibration of SOP recordshave been verified with VISAR.
• Temperature measurements using the absolute spectralcalibration are useful in evaluating EOS models.
• Optical self-emission will be a key diagnosticof future shaped-pulse work.
1 J. A. Oertel et al., Rev. Sci. Instrum. 70, 803 (1999).2 Velocity Interferometer System for Any Reflector
Summary/Conclusions
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