Status of the OMEGA EP Laser System - Rochester, NY · The OMEGA/OMEGA EP Laser System is a unique...
Transcript of Status of the OMEGA EP Laser System - Rochester, NY · The OMEGA/OMEGA EP Laser System is a unique...
T. C. SangsterUniversity of RochesterLaboratory for Laser Energetics
38th Annual Anomalous Absorption Conference
Williamsburg, VA1–6 June 2008
Status of theOMEGA EP Laser System
The OMEGA/OMEGA EP Laser System is a unique HED research platform
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• TheOMEGAEPprojectwascompletedinApril2008.
• ManyoftheessentialdiagnosticsidentifiedduringaseriesofOMEGAEPusersworkshopswillbeavailablebythestartofoperationsinOctober.
• Asetofnear-termexperimentsisplannedduringthesummer asthefacilityperformancecontinuestoramptodesigngoals.
• Approximately25%oftheshottimeavailableforbasicscience.
Summary
ThecombinedOMEGA/OMEGA EP Laser System willallowawidervarietyofhigh-energy-density physicsexperiments
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• SignificantadvancesinradiographiccapabilitiesforHEDexperiments
• Developmentofdiagnosticsanddiagnostictechniques for the NIF
• Studiesofthefast-ignition concepts
• Additionalprecision HEDphysicsexperiments
• Studiesofultrahigh-intensitylaser–matterinteractions
•Optimizing the use of the NIF throughplatformdevelopment
TheOMEGAEParchitectureisbasedonmulti-configurablebeampaths
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Short pulse
Long pulse
Short pulse
Long pulse
Long pulse
Long pulse
IR Beamline 1
IR Beamline 2
IR Beamline 3
IR Beamline 4 UV xtals and transport
UV xtals and transport
UV xtals and transport
UV xtals and transport
Gratingcompressor
chamber
OMEGA TargetChamber
OMEGA EPTarget
ChamberSwitchyard
Shield wall
NIF-like
OMEGAEPwillachieveitsmissionsusingavarietyof on-targetintensitiesandpulsedurations
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Performance capabilities Short-pulse beam 1 Short-pulse beam 2 Long-pulse
beams 1–4
Target chamber X or EP X or EP EP
Pulsewidth 1–10 ps 10–100 ps 1–80 ps 80–100 ps 1 ns 10 ns
Energy on target (kJ)
1–2.6 (grating limited)
2.60.03–2.6
(combiner limited)
2.6 2.5 6.5
Intensity(W/cm2) 3 × 1020 8 × 1019 2 × 1018 3 × 1016 8 × 1015
Focusing (diam) >80%in20nm >80%in40nm >80%in100nm
Wavelength (nm) 1053 1053 351
SimultaneoussidelightingandbacklightingwillbepossibleinthenewOMEGA EP target chamber
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Backlighterparabola Target
Backlighter2.6kJ, 10 ps
Sidelighter2.6kJ, 10 ps
Diagnostic inserter
Sidelighterparabola
Up to four long-pulseUV beams 10 ns,6.5kJ
ThebeamsfromOMEGAEPwillbefocusedwitha23° f/2off-axisparabolainsidetheOMEGAtargetchamber
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• Afast-focusingopticis necessary to meet the20-nm-diamfocal-spot requirement
• Pointingrequirement inOMEGA:20-nm rms
• 2-hshotcycle (in either chamber)
Cryo equipment
Target
Parabola
Combinedshort-pulse beams2.6kJ 10psand2.6kJ 80ps
OMEGAEPwascompletedon25April2008—onscheduleandonbudget
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OMEGAEPsignificantlyadvancesNNSA’s User Facility capabilities.
OMEGA EP met most of its completion criteria
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• ThemeasuredfocalspotexceedtheR80 = 20 nm requirement –operationalexperiencewillreducethefocalspotsize
• TheremainderofFY08willbeusedtogainoperationalexperience andperforminitialexperiments
OMEGAEPfired22targetshotstotheOMEGAchamberinfourdays.
OMEGA EP performance to the OMEGA target chamber
Criteria Beamline 1 Beamline 2
Co-propagatingpulseduration 84ps 9.5ps
On target energy 630 J 460J
Co-timingtoOMEGA 6-psrms 6-psrms
Focal spot (R80) 33 nm
Timebetweenshots 1.7 h 1.7 h
Pointing stability 2.8-nradrms 3.0-nradrms
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TheOMEGAEPcompressorsanddiagnosticswere themosttechnicallychallengingaspectoftheproject
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Fourtiled-gratingassemblies(TGA’s) of the upper compressor areshownwithancillaryopticsfortransportanddiagnostics.
TGA2
TGA3
TGA4
TGA1
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“Subpicosecondcompression”wasachieved atvacuumfor5-HzOPCPAbeams
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Lessthan1-pspulsewidthachievedonbothcompressors fortiledgratingsinvacuum.
Autocorrelator tracefor lower compressor
AC FWHM= 888 fs
AC FWHM= 800 fs
–3 –2 –1 0ps
1 2 3 –3 –2 –1 0ps
1 2 3
Autocorrelator tracefor upper compressor
AvgSmoothed
AvgSmoothed
No
rmal
ized
inte
nsi
ty
No
rmal
ized
inte
nsi
ty
Thefocal-spotdiagnostic(FSD) is a novelsystemcapableofon-shotspotcharacterization
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• TheFSDconcept
– calculatetheon-targetfocalspotfrommeasurementsthatgive theon-shotamplitudeandwavefrontattheOAP
1.Pre-shotcalibration2.On-shotmeasurement3.Post-shotcalculation
ThreestepsrequiredbyFSD
Focal spot
Log scale (4 decades)
Wavefront
Multiplefocal-spotmeasurementsindicatean average R80valueof34nm
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00.0
0.2
0.4
0.6
0.8
1.0
En
cirl
ed e
ner
gy
Radius (nm)
80604020
R80 = 32.5 nm
R60 = 24.7 nm
R40 = 19.9 nm
R20 = 12.7 nm
–4
–3
–2
–1
0
0x (nm)
200100–200 –100
y (n
m)
–200
–100
200
0
100
Focal spot (log scale)
R80R80
Measured Criteria
33.0 nm
20.0 nm35.5nm
32.5nm
OMEGAEPshort-pulseenergieswillberamped tofullcapabilityduringFY09
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10-ps activationenergy
1001010
1500
2000
3000
2500
1000
500
0
Energy on target versus pulse width
Sh
ort
-pu
lse
EO
T (
J)
Pulse width (ps)
270 J140 J
760 J
1.0 PW
0.5 PW
2.6 kJ
1.35 kJ
Full backlighter capability
Full sidelighter capability
Initial sidelighter limit
Initial backlighter limit
100-ps activationenergy
Anumberoflong-andshort-pulsediagnostics willbeavailableonOMEGAEP
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• Long-pulseUVdiagnostics
– framingcamera,pinholecamera,spectrometer(TIMbased)
– x-rayCCDcamera,x-raystreakcamera(TIMbased)
– fixedpinholecamera(CIDreadout,done)
–HXRD(designstarted,completeFY08)
–ASBO/SOP (designstarted,completeFY09)
• Short-pulsediagnostics
– single-photon-counting(designstarted,completeFY08)
– opticaltransitionradiationdiagnostic(plannedforFY09)
–K-shellspectroscopy(plannedforFY09)
– softx-raydiodes(plannedforFY09)
– neutrondetector(done)
– x-raymonitor(done)
– EMPmonitor(done)
– radiationmonitor(95%done)
AseriesofOMEGAEPUsePlanningworkshopswasheld
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• January2006—Developprioritiesforcapabilitydevelopment – over50externaluserparticipants(national laboratory, university,andforeign) –workinggroupssuggested - fastignition - short-pulse,hard x-raysourcesanddetectors - ionsources - long-pulsedynamicloading - isochoricheatingofwarmdensematter - backlightimplosions
• May2007—Begandetailedexperimentalplanning – first100shotsdefined
• April2008—Detailedexperimentalplanning – targetdesignandlaserconfiguration
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Target Goal Diagnostics Number of Shots
Fast Ignition: SandwichplanartargetsAl/Cu/Al,Al,freestudy
Electron/protonproductiontemperaturewith10-ps pulses Ka spectroscopy 15
CHfoilwithwitnesslayer Initial channeling X-ray imaging, transmittedlight 5
Hardx-ray, WDM: AgandSmfoil/flag/wire,resolutiongrid
Hardx-rayandkeVbroadband
50~100micspots,x-ray spectometers, imagers 15
High-brightnesskeVsources:F~Si materials, foams, colloidaltargets
High brightness for ICF backlighting
keVx-ray spectrometer,x-raystreakcamerawithspectrometer
10
Long-pulsebacklighting:Thickfoil(pinhole for PPB) Develop capability X-raystreak 5
Low-andhigh-Z ions:Thin foil Develop capability Optical pyrometer,
heating source, RCF 5
HED materials:Thin Al/Si02 foil Initialshockvelocity ASBO/VISAR 10
Al foil Direct measure of Al EOS Hard x-ray source anddetector 5
WDM:Planar foil Double/collidingshock SOP 5
ICF:Planar foil Initial scale length FABS,HXRD4~ probe 5
ComplexHydro:Washers/foam Initialepisodicjet X-rayimage 5
D3He proton source:Explodingpusher Monoenergetic proton source WRF 2
High-intensity physics:Planarfoil,gasjet
Magnetic-field+ MeVphoton generation
Photondiagnostic,photon beam, nuclear activation
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ApproximatelyhalfoftheOMEGAEPUsers’ShotPlanwillbeexecutedinFY08
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Nearly25%oftheshottimeonOMEGAEP willbedevotedtobasicscience
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Category SubdivisionFY09NotionalAllocation
%* OMEGAShots** OMEGAEPShots**
National Ignition Campaign
IDIDDI
1040
105420
45180
HED LLNLandLANL
20 210 90
Basic Science NLUFLaboratory
1312
136126
5854
Contingency 5 53 23
Total 100 1050 450
TheFY09schedulewillbedeterminedby1July2008.
*AllocationrecommendedbyFSACinJune2007andapprovedbyLLEDirector.**Shotavailabilityatfulloperationsfunding.
• TheOMEGAEPprojectwascompletedinApril2008.
• ManyoftheessentialdiagnosticsidentifiedduringaseriesofOMEGAEPusersworkshopswillbeavailablebythestartofoperationsinOctober.
• Asetofnear-termexperimentsisplannedduringthesummer asthefacilityperformancecontinuestoramptodesigngoals.
• Approximately25%oftheshottimeavailableforbasicscience.
The OMEGA/OMEGA EP Laser System is a unique HED research platform
E16808
Summary/Conclusions