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Energetic neutron beams generated from femtosecond laser plasma interactions
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Image of FIG. 1.
FIG. 1.

Simulated and experimental ion (a) and neutron (b) spectra along the target normal direction. (a) The P-Li spectrum from 100 nm Parylene shows the highest energies and total flux. The D-Li (Ice) spectrum shows higher flux and energy than D-Li (Paint). The simulated D-Li (Ice) spectrum was calculated with exponential scale length and scaled to match the experimental flux. (b) Experimental spectra from the four reactions. Monte Carlo simulated neutron spectra are shown for comparison.

Image of FIG. 2.
FIG. 2.

Ion spectra for Q/M = 1 (a) and Q/M = 1/2 (b) parabolas from sequential laser shots on 1.8 μm Al foil. (a) Proton spectra for the clean and ice covered target case showing suppression of the protons by the ice layer. (b) Q/M = 1/2 trace showing a small amount of C6+ contaminant for the clean case. The ice case shows no O7+ which precludes the presence of O8+ contamination in the trace, as well as no carbon traces, yielding a pure deuteron signal. The corresponding Thomson parabola traces for the clean (c) and ice (d) case demonstrate the dramatic increase in deuteron signal. Additionally, the heavy ion traces change from carbon (c) to oxygen (d). The dashed lines indicate the location of the proton and Q/M = 1/2 parabolas.


Generic image for table
Table I.

Nuclear reactions and target configurations investigated on HERCULES. The highest measured flux was observed for the P-Li reaction, and the highest energy was observed for the D-Li (ice) reaction.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Energetic neutron beams generated from femtosecond laser plasma interactions