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Advanced scheme for high-yield laser driven nuclear reactions

D Margarone, A Picciotto, A Velyhan, J Krasa, M Kucharik, A Mangione, A Szydlowsky, A Malinowska, G Bertuccio, Y Shi2015年Plasma Physics and Controlled FusionIF 2.2出版社

The use of a low contrast nanosecond laser pulse with a relatively low intensity (3  ×  1016 W cm−2) allowed the enhancing of 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 a target. A combination of the specific target composition and the laser pulse temporal shape allowed the enhancing of the yield of alpha particles up to 109 per steradian. 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.

日本語訳

低コントラストのナノ秒レーザーパルスを比較的低い強度(3×10¹⁶ W cm⁻²)で用いることにより、固体ターゲットにおける誘起核反応の収率を向上させることができた。特に、中性子を生成せずにアルファ粒子を生成する「ウルトラクリーン」陽子-ホウ素核融合反応を選択した。水素富化シリコン基板中に空間的に明確に定義されたホウ素ドーパント層をターゲットとして使用した。特定のターゲット組成とレーザーパルスの時間波形の組み合わせにより、アルファ粒子の収率を1ステラジアンあたり10⁹個まで向上させることができた。この結果は、長いレーザープリパルスとターゲットとの相互作用、ならびに最適なターゲット形状と組成に帰することができる。

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