26 February 2015 Advanced scheme for high-yield laser driven proton-boron fusion reaction
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Abstract
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.
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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, 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); doi: 10.1117/12.2084598; https://doi.org/10.1117/12.2084598
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