Independent operations of 3 legs of OMEGA-60

• Long-term request: 3 independent legs– Benefits include

• Overall increased flexibility in beam/driver configuration• Use 2 beam legs on BL Driver• 3 independent pulse shapes• Beam delays longer than current PLAS limitations• Increased energy performance on BL Driver

• Short-term request: 2 legs on BL driver – Benefits include

• Overall increased flexibility in beam/driver configuration• Use 2 beam legs on BL Driver• Increased energy performance on BL Driver

Carolyn Kuranz OLUG 2011

Using 2 beam legs on BL Driver would benefit experiments that need bright x-ray sources for diagnostic techniques

• Techniques such as x-ray radiography and x-ray Thomson scattering require bright x-ray sources

• Creating x-ray sources from high-Z materials requires high-irradiance laser pulses

• This will improve current experiments as well as open a new class of experiments involving bright x-ray sources

Radiative shock target

Be disk

Xe filled tube

Gold shielding

Scattered spectrum collected with the zinc spectrometer. Analysis indicates a weighted average electron temperature of ~35 eV.

Beam delays longer than current PLAS limitations can be used to increase delays between multiple observations

on a single shot

• Beneficial to experiments using multiple diagnostic techniques

Hartigan et al, Astrophysical Journal, 2009

By Q4 FY12

• Backlighter driver going down shortly• BL driver to use Main regen

– Add improved timing diagnostics• Could result in better than 100 ps accuracy for very

long delays

– Improved stability– Improved spatial profile

• Possible increase in energy

Proposal for next FY

• Add 64 mm amplifier to BL driver– Current configuration of SSD driver (LARA and 64

mm amp)– Increased Energy available

Future possibilities

• 2 leg Limited option– Allows for BL to run 2 specific legs– Leg 1 and 3 OR Legs 2 and 3– Cost unknown but limited downtime to BL

• Redo A-split – ~$ 1 mil, large amount of downtime

• Duplicate 1-split- similar cost, possibly less downtime

• 3 drivers – very costly, space issues

New Recommendation: Imaging Thomson scattering measures plasma conditions along the Thomson scattering probe beam providing spatially resolved data

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Te peaks where the beams crossOctober ‘05 Shots (ITS Activation): ITS slot was cut 200m from LEH Imaging TS uses 200 ps probe

pulse for time resolution

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Thomson Scattering (t=800ps)Flux Limit Diffussion (f=0.05)Nonlocal Model

Position (mm)

Imaging TS Data

Slide Credit: Steven Ross

Summary

• Recommendations completed or underway– Increased accuracy in driver-to-driver timing for

long driver delays– 10 additional SG8 phase plates– Improved BL driver performance

• New or continued recommendations– Independent operation of 3 beam legs– Imaging UVTS– Foreground illumination in TVS viewers

Thanks to…

• Jason Puth• Elizabeth Hill• Steve Stagnitto • Sam Morse• and many more..

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Viewed from TIM2

Target Plane

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The spectral slit has been aligned with the 4 probe beam by rotating the spectrometer by 52 degrees

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Spectrometer view(prior to rotation)

52o CW Rotation

Spectrometer is rotated by 52 degrees to align the spectral slit along the P9 axis (hohlraum axis)

Grid is rotated 52 CW by transport mirrors

Field of view is 2-mmSystem resolution: clearly resolves 63 micron features

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Slot (0.5mm x 1.6mm) 4

Slide Credit: Steven Ross

Update on improved timing for long delays between drivers

• Currently using longer sweep speed on P510s which has improved timing accuracy

• LLE is continuing to improve this by adding a timing scope on the front end– Could result in better than 100 ps accuracy for

very long delays