Optimization of cone target geometry for fast ignition
Optimization of cone target geometry for fast ignition
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DOI：
10.1063/1.2789561
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发表时间：
2007-10
影响因子：
2.2
通讯作者：
Tatsufumi Nakamura;H. Sakagami;T. Johzaki;H. Nagatomo;K. Mima;J. Koga
中科院分区：
文献类型：
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作者：
Tatsufumi Nakamura;H. Sakagami;T. Johzaki;H. Nagatomo;K. Mima;J. Koga
利用锥形靶控制超强激光脉冲照射固体靶产生的电子能量特性。引入了表征激光与锥体相互作用的两个参数，即锥角和激光光斑尺寸与锥尖尺寸之比。通过改变这些参数，控制了能量吸收率、锥体尖端的激光辐照度以及锥体尖端和侧壁的电子加速度。快速点火的最佳锥靶为30°锥角，双锥体几何形状，尖端尺寸与芯体尺寸相当，激光脉冲的光斑尺寸约为锥体尖端尺寸的4倍。锥靶有可能通过使用取决于激光f数的较小角度锥体来提高激光加速质子的最大能量。
Electron energy characteristics generated by the irradiation of ultraintense laser pulses onto solid targets are controlled by using cone targets. Two parameters characterizing the laser-cone interaction are introduced, which are cone angle and the ratio of the laser spot size to the cone tip size. By changing these parameters, the energy absorption rate, laser irradiance at the cone tip, and electron acceleration at the cone tip and side wall are controlled. The optimum cone targets for fast ignition are 30° cone angle with double-cone geometry, and a tip size comparable to the core size, with the irradiation of a laser pulse with a spot size of about four times the cone tip size. Cone targets have the possibility to enhance the maximum energy of laser-accelerated protons by using a smaller angle cone depending on the laser f-number.