脉冲驱动磁化等离子体内爆升温点火的数值模拟北大核心CSCD

通过建立物理模型,用一维三温拉氏磁流体力学程序分析了由强电流(MA)脉冲驱动的金属套筒内爆压缩磁化等离子体的升温点火及能量增益过程。分析了脉冲驱动的金属套筒内爆、不同驱动源对金属套筒内爆升温的影响、Z箍缩过程中内嵌磁场和预加热温度对磁化等离子体升温的影响,以及点火需要的初态参数和点火后的能量输出。此外,对该过程中磁场增加α粒子能量沉积、降低电子离子热传导能量损失的物理机制做了介绍和分析。磁流体数值模拟结果显示:当初始的内嵌磁场和燃料的预加热温度分别取5T和250eV时,即可获得超过4keV的升温,初始参数包括内嵌磁场、预加热温度、燃料密度、套筒尺度、驱动脉冲幅值、加载时间等。在一定的条件下,点火成功,可产生kT量级的强磁场,并获得百kJ/mm量级的能量输出。

Numerical modeling about ignition and implosion heating process of magnetized plasma driven by pulsed-power

A physical model of heating and ignition of magnetized plasma is presented, which is analyzed by 1D 3T MHD Lagrange code in the metal liner driven by pulsed-power. The analysis includes the procedure of metal liner implosion driven by pulse, the impact of different driving source within magnetized target warming on, the effects of embedded magnetic field and the pre-heating temperature for magnetized plasma warming during Z-pinch process, the initial parameters for ignition and energy output. The physical mechanism is introduced in which the magnetic field increases the energy deposition and reduces energy loss through heat conduction electron and ionization. The simulation indicates that a strong magnetic field (over 1000 T) is produced during the implosion procedure and obvious heating-up (about 4 keV) can be acquired by selecting 5 T embedded magnetic field and 250 eV preheat temperature for the target. We get the order of one thousand T magnetic field and the energy output about a hundred kJ/mm level when the initial parameters, including embedded magnetic field, pre-heating temperature, fuel density, liner scale, pulse amplitude and loading time, are under certain conditions.