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- W2023637079 abstract "The generation of energetic protons using a polyimide tape of 7.5 μm thickness was carried out with laser pulses of 30 mJ energy and 80 fs duration. A deformable mirror system with a genetic algorithm (GA) was developed to optimize the laser-focusing spot. The fitness values used in the GA were measured from the focusing intensities under the low-gain condition of the power amplifier, or from x-ray in situ signals emitted from the target. Although we obtained a diffraction-limited size of 2 μm (full width at half maximum) using the former value, a precise optimization using the latter value was essential to accelerate protons whose flux was 10<sup>6</sup>/MeV/shot to a maximum energy of 1.1±0.3 MeV with laser pulses of only 30 mJ energy since a laser spot that is too tight may be sensitive to wave-front distortion caused by residual thermal lenses of the power amplifier." @default.
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- W2023637079 date "2005-12-09" @default.
- W2023637079 modified "2023-10-18" @default.
- W2023637079 title "Generation of MeV proton with 30 mJ laser energy by optimizing focusing spot using deformable mirror" @default.
- W2023637079 doi "https://doi.org/10.1117/12.669278" @default.
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