Three-dimensional fast electron transport for ignition-scale inertial fusion capsules
Three-dimensional fast electron transport for ignition-scale inertial fusion capsules
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DOI：
10.1088/0029-5515/46/11/l02
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发表时间：
2006-05
期刊：
影响因子：
3.3
通讯作者：
J. Honrubia;J. Meyer-ter-Vehn
中科院分区：
文献类型：
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作者：
J. Honrubia;J. Meyer-ter-Vehn
采用三维混合PIC模拟方法研究了全尺寸快点火构型中电子能量的输运和沉积过程。当注入几吉安培、几拍瓦的束流时，发现了接近点火的多管式堆芯加热。日冕中的阻性束丝形成了穿透核心的3D电流模式。欧姆加热在低密度日冕中很重要，而经典的库仑沉积则加热核心。当束流密度大于200g cm−3时，能量密度最高(10keV时很少)。与核心的能量耦合在20%到30%之间；束流准直增强了耦合能，当束流粒子能量从1.5MeV提高到5.5MeV时，耦合能降低。
Three-dimensional (3D) hybrid PIC simulations are presented to study electron energy transport and deposition in a full-scale fast ignition configuration. Multi-prong core heating close to ignition is found when a few giga-amperes, few peta-watts beam is injected. Resistive beam filamentation in the corona seeds the 3D current pattern that penetrates the core. Ohmic heating is important in the low-density corona, while classical Coulomb deposition heats the core. Here highest energy densities (few Tbar at 10 keV) are observed at densities above 200 g cm−3. Energy coupling to the core ranges from 20% to 30%; it is enhanced by beam collimation and decreases when raising the beam particle energy from 1.5 to 5.5 MeV.