Cone-guided fast ignition with ponderomotively accelerated carbon ions
Cone-guided fast ignition with ponderomotively accelerated carbon ions
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DOI：
10.1088/0741-3335/53/4/045014
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发表时间：
2011-03
影响因子：
2.2
通讯作者：
C. Regan;T. Schlegel;V. Tikhonchuk;J. Honrubia;J. Feugeas;P. Nicolaï
中科院分区：
文献类型：
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作者：
C. Regan;T. Schlegel;V. Tikhonchuk;J. Honrubia;J. Feugeas;P. Nicolaï
碳离子被用于加热在锥形引导快速点火器方案中的预压缩的氘-氚（DT）燃料，其面质量密度约为2.6 g cm−2。焦点强度为1.45 × 1022 W cm−2的超强激光脉冲将碳离子从密度为0.2 g/cm 3的均匀层加速到450 MeV的能量，该层填充了金锥的头部。弹丸点火观察混合动力数值模拟的激光能量约65千焦的矩形脉冲的4 ps的持续时间。这相当于离子加速的估计总效率超过24%，核心加热的估计总效率超过17%。将激光强度降低到5 × 1021 W cm−2，能量为175 MeV的碳离子将被加速，并且在流体动力学模拟中，在降低6%的加热效率下，激光能量为115 kJ时发生点火。与点火的大规模DT丸，表现出类似的流体动力学特性，并在原位加速DT离子与10 MeV的平均能量加热的比较，证明了由于更有效的加速和预期的更高的方向性的碳离子点火器束的优势。
Carbon ions are used to heat the precompressed deuterium–tritium (DT) fuel in a cone-guided fast ignitor scheme with an areal mass density of about 2.6 g cm−2. An ultra-intense laser pulse with a focal intensity of 1.45 × 1022 W cm−2 accelerates the carbon ions to an energy of 450 MeV from a homogeneous layer of 0.2 g/cm3 density, which fills the head of the gold cone. Pellet ignition was observed in hybrid numerical simulations for a laser energy of about 65 kJ in a rectangular pulse of 4 ps duration. This corresponds to estimated overall efficiencies of more than 24% for ion acceleration and 17% for core heating. Reducing the laser intensity to the value 5 × 1021 W cm−2, carbon ions with the energy of 175 MeV will be accelerated, and ignition occurred in hydrodynamic simulations for a laser energy of 115 kJ at a reduced heating efficiency of 6%. The comparison with ignition of a large-scale DT pellet, showing similar hydrodynamic characteristics and heated by in situ accelerated DT ions with 10 MeV mean energy, demonstrates the advantage of the carbon ion ignitor beam due to the more effective acceleration and expected higher directionality.