Abstract
A new x-ray technique for recording the relative arrival times of multiple laser beams at a common target with better than ±10-ps accuracy has been implemented at the Nova laser facility. 80-ps, 3ω Nova beams are focused to separate locations on a gold ribbon target viewed from the side. The measurement consists of using well-characterized reentrant x-ray streak cameras for one-dimensional streaked imaging of the ≳3-keV x rays emanating from these isolated laser plasmas. After making the necessary corrections for the differential laser, x-ray and electron transit times involved, timing offsets as low as ±7 ps are resolved, and on subsequent shots, corrected for, verified, and independently checked. This level of synchronization proved critical in meeting the power balance requirements for indirectly driven pulse-shaped Nova implosions.
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