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26 February 2015 Advanced scheme for high-yield laser driven proton-boron fusion reaction
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A low contrast nanosecond laser pulse with relatively low intensity (3 × 1016 W cm–2) was used to enhance the yield of induced nuclear reactions in advanced solid targets. In particular the "ultraclean" proton-boron fusion reaction, producing energetic alpha-particles without neutron generation, was chosen. A spatially well-defined layer of boron dopants in a hydrogen-enriched silicon substrate was used as target. The combination of the specific target geometry and the laser pulse temporal shape allowed enhancing the yield of alpha-particles up to 109 per steradian, i.e 100 times higher than previous experimental achievements. Moreover the alpha particle stream presented a clearly peaked angular and energy distribution, which make this secondary source attractive for potential applications. This result can be ascribed to the interaction of the long laser pre-pulse with the target and to the optimal target geometry and composition.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. Margarone, A. Picciotto, A. Velyhan, J. Krasa, M. Kucharik, M. Morrissey, A. Mangione, A. Szydlowsky, A. Malinowska, G. Bertuccio, Y. Shi, M. Crivellari, J. Ullschmied, P. Bellutti, and G. Korn "Advanced scheme for high-yield laser driven proton-boron fusion reaction", Proc. SPIE 9345, High Power Lasers for Fusion Research III, 93450F (26 February 2015);

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