Direct-Drive Inertial Confinement Fusion Implosions on Omega
Direct-Drive Inertial Confinement Fusion Implosions on Omega
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DOI：
10.1007/1-4020-4162-4_32
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发表时间：
2005-06
影响因子：
1.9
通讯作者：
S. Regan;T. Sangster;D. Meyerhofer;K. Anderson;R. Betti;T. Boehly;T. Collins;R. Craxton;J. Delettrez;R. Epstein;O. Gotchev;V. Glebov;V. Goncharov;D. Harding;P. Jaanimagi;J. Knauer;S. Loucks;L. Lund;J. Marozas;F. Marshall;R. Mccrory;P. McKenty;S. Morse;P. Radha;W. Seka;S. Skupsky;H. Sawada;V. Smalyuk;J. Soures;C. Stoeckl;B. Yaakobi;J. Frenje;Chikang Li;R. Petrasso;F. Séguin
中科院分区：
文献类型：
--
作者：
S. Regan;T. Sangster;D. Meyerhofer;K. Anderson;R. Betti;T. Boehly;T. Collins;R. Craxton;J. Delettrez;R. Epstein;O. Gotchev;V. Glebov;V. Goncharov;D. Harding;P. Jaanimagi;J. Knauer;S. Loucks;L. Lund;J. Marozas;F. Marshall;R. Mccrory;P. McKenty;S. Morse;P. Radha;W. Seka;S. Skupsky;H. Sawada;V. Smalyuk;J. Soures;C. Stoeckl;B. Yaakobi;J. Frenje;Chikang Li;R. Petrasso;F. Séguin
直接驱动惯性约束聚变(ICF)创造了物质的极端状态。目前在60束欧米茄激光系统上进行的直接驱动低温靶内爆试验中，被压缩靶的测量压力为5 GBAR。这些目标是根据国家点火设施的点火目标进行流体力学定标的。据预测，点火目标点火后的峰值压力为3Tbar。ICF靶的加速和减速是在热的低密度等离子体对冷的高密度等离子体的推动下实现的，这使得靶的内爆本身就容易受到Rayleigh-Taylor流体动力不稳定性(RTI)的影响。不稳定的RTI增长导致冷的高密度壳层等离子体与低密度的热点等离子体的混合，并降低了内爆的初级中子产额。控制RTI生长的策略是降低种子(例如激光压痕和靶面粗糙度)和主要模式的生长速率。本文报告了我们最近的实验，在验证用于设计未来高增益低温DT靶的流体动力学代码方面的进展，以及改善靶性能的技术。简要描述了一种新的高能千瓦级激光器--欧米伽EP(扩展性能)--它正被添加到欧米伽压缩设备中。
Direct-drive inertial confinement fusion (ICF) creates extreme states of matter. In current direct-drive cryogenic target implosions on the 60-beam OMEGA laser system, the compressed target has a measured pressure of 5 Gbar. These targets are hydrodynamically scaled from ignition targets for the National Ignition Facility. The ignition targets are predicted to have peak pressures of 3 Tbar after the target ignites. ICF target acceleration and deceleration are realized when hot, low-density plasma pushes against cold, high-density plasma, making the target implosion inherently susceptible to the Rayleigh-Taylor hydrodynamic instability (RTI). The unstable RTI growth causes mixing of cold, high-density shell plasma with the low-density, hot-spot plasma and reduces the primary neutron yield of the implosion. The strategy to control the RTI growth is to reduce the seeds (e.g., laser imprint and target-surface roughness) and the growth rates of the dominant modes. This paper reports on our recent experiments, progress in validating the hydrodynamics codes that are used to design future high-gain cryogenic DT targets, and techniques to improve target performance. A brief description is given of a new high energy petawatt laser — OMEGA EP (extended performance) — that is being added to the OMEGA compression facility.