A representation of a third order cross-correlation trace of the Trident 200 TW short-pulse system after the highest gain part of the system, the regenerative amplifier (regen). The laser has an ASE contrast ratio of , as measured by the energy output of the regen. The ASE contrast is the long (nanosecond) pedestal on which the short pulse rides, and the prepulse contrast refers to the number and magnitude of any compressed pulses occurring before the main short pulse. Recently (Ref 11), it was measured that Trident has two prepulses, one at at a level of and one at at a level of .
(Right image) Trident 200 TW focal spot. (Left image) Encircled energy within the focal spot. The FWHM of the focal spot corresponds to a radius of . The image of the focal spot is saturated to bring out the partial Airy disks in the background.
Trident shot number 19898. 85.6 J in 737 fs on a Mo target. The intensity is calculated to be . (Left image) RCF stack, film by film. (Right image) Proton spectrum showing a laser to proton energy conversion efficiency.
Trident’s performance in terms of maximum proton energy vs laser intensity, compared to three published scaling laws.
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