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Characterizing and optimizing hot electrons accelerated by short pulse lasers is of great interest, especially for Fast Ignition (FI) research. To date, most research on electron source and transport has been done using lasers with intrinsic prepulses. However, even a relatively low amount of prepulse (1–10 mJ in 3 ns) creates an underdense plasma that causes instabilities such as filamentation and...
Laser facilities for fast ignition will require in excess of 50 kJ of short pulse laser energy. Based on the current contrast estimate for the NIF ARC laser system at LLNL, ignition scale systems will have pre-pulses at the ~J level. This will produce a large scale-length plasma inside the reentrant fast ignition cone that could significantly influence the generation and transport of hot electrons...
We describe measurements characterizing the interaction of ultra-high intensity Petawatt laser pulses with solid targets. Experiments were performed on the Petawatt laser at RAL, and the Titan laser at LLNL.
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