Gotchev O V, Knauer J P, Chang P Y, Jang N W, Shoup M J, Meyerhofer D D, Betti R
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA.
Rev Sci Instrum. 2009 Apr;80(4):043504. doi: 10.1063/1.3115983.
A compact, self-contained magnetic-seed-field generator (5 to 16 T) is the enabling technology for a novel laser-driven flux-compression scheme in laser-driven targets. A magnetized target is directly irradiated by a kilojoule or megajoule laser to compress the preseeded magnetic field to thousands of teslas. A fast (300 ns), 80 kA current pulse delivered by a portable pulsed-power system is discharged into a low-mass coil that surrounds the laser target. A >15 T target field has been demonstrated using a <100 J capacitor bank, a laser-triggered switch, and a low-impedance (<1 Omega) strip line. The device has been integrated into a series of magnetic-flux-compression experiments on the 60 beam, 30 kJ OMEGA laser [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. The initial application is a novel magneto-inertial fusion approach [O. V. Gotchev et al., J. Fusion Energy 27, 25 (2008)] to inertial confinement fusion (ICF), where the amplified magnetic field can inhibit thermal conduction losses from the hot spot of a compressed target. This can lead to the ignition of massive shells imploded with low velocity-a way of reaching higher gains than is possible with conventional ICF.
一种紧凑、独立的磁种子场发生器（5至16特斯拉）是激光驱动靶中一种新型激光驱动磁通压缩方案的 enabling 技术。磁化靶直接受到千焦或兆焦激光的照射，以将预先注入的磁场压缩到数千特斯拉。由便携式脉冲功率系统提供的快速（300纳秒）、80千安电流脉冲被放电到围绕激光靶的低质量线圈中。使用<10万焦耳的电容器组、激光触发开关和低阻抗（<1欧姆）带状线，已证明能产生>15特斯拉的靶场。该装置已被集成到在60束、30千焦的OMEGA激光上进行的一系列磁通压缩实验中 [T. R. 博埃利等人，《光学通信》133, 495 (1997)]。最初的应用是一种新型磁惯性聚变方法 [O. V. 戈切夫等人，《核聚变能源杂志》27, 25 (2008)] 用于惯性约束聚变（ICF），其中放大的磁场可以抑制压缩靶热点的热传导损失。这可以导致低速内爆的大型壳层点火——这是一种实现比传统ICF更高增益的方法。
