Evidence of anomalous resistivity for hot electron propagation through a dense fusion core in fast ignition experiments
Evidence of anomalous resistivity for hot electron propagation through a dense fusion core in fast ignition experiments
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DOI：
10.1088/1367-2630/11/9/093031
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发表时间：
2009-09
影响因子：
3.3
通讯作者：
T. Yabuuchi;A. Das;G. Kumar;H. Habara;P. Kaw;R. Kodama;K. Mima;P. Norreys;S. Sengupta;K. Tanaka
中科院分区：
文献类型：
--
作者：
T. Yabuuchi;A. Das;G. Kumar;H. Habara;P. Kaw;R. Kodama;K. Mima;P. Norreys;S. Sengupta;K. Tanaka
研究了快点火激光聚变中热电子通过致密核等离子体时的异常电阻率。在半径为15 ~ 25 μm的密度为50 ~ 100 g cm−3的致密等离子体中，测量了由超强激光脉冲和导向锥相互作用产生的热电子。当通过超强激光脉冲注入获得显著的中子增强时，观察到快电子的能量降低。此外，能量高达15兆电子伏特的电子数量也有所减少。我们提出了一种新的电子停止的物理机制，涉及电子磁流体动力激波在非均匀等离子体密度区域的形成。激波区的耗散可以解释15兆电子伏特量级的电子停止。
Anomalous resistivity for hot electrons passing through a dense core plasma is studied for fast ignition laser fusion. The hot electrons generated via the ultra-intense laser pulse and guiding cone interactions are measured after they pass through a dense plasma with a density of 50–100 g cm−3 in a radius of 15–25 μm. When significant neutron enhancements are achieved by the ultra-intense laser pulse injection, the energy reduction of fast electrons is observed. Also, a reduction in the number of electrons with energy up to 15 MeV can be seen. We offer a new physical mechanism for the stopping of electrons, involving electron magnetohydrodynamic shock formation in the inhomogeneous plasma density region. The dissipation in the shock region can explain electron stopping with energies of the order of 15 MeV.