Inertial fusion fast ignitor: Igniting pulse parameter window vs the penetration depth of the heating particles and the density of the precompressed fuel
Inertial fusion fast ignitor: Igniting pulse parameter window vs the penetration depth of the heating particles and the density of the precompressed fuel
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DOI：
10.1063/1.873571
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发表时间：
1999-08-01
影响因子：
2.2
通讯作者：
Atzeni, S
中科院分区：
文献类型：
--
作者：
Atzeni, S
快速点火器方案的一个关键要素是产生点火火花的快速粒子的脉冲。本文用二维数值模拟的方法研究了快粒子穿透深度R与脉冲参数(能量E-p、功率W-p、强度i-p)的关系。在密度Rho下预压的重氚燃料被一束指定为R的粒子束加热后，在(E-p，W-p，i-p)空间中的点火窗口在小于或等于R小于或等于1.2g/cm(2)的0.15范围内几乎不依赖于R。在Rho=300g/cm(3)时，最小点火能量约为14kJ；一组最优参数(能量和功率接近所需的最小值，且强度相对接近最小值)是E(P)一致到17kJ，W(P)一致到0.85×10(15)W，I(P)一致到6.5×10(19)W/cm(2)(在R=0.6g/cm(2)时得到)。最佳能量随密度E(P)与Rho(-1.85)成正比。文中还给出了其他脉冲参数和极限能量增益的标度律。(C)1999年美国物理研究所。[S1070-664X(99)01907-2]。
A key element of the fast ignitor scheme is the pulse of fast particles creating the igniting spark. In this paper, the dependence of the parameters (energy E-p, power W-p, intensity I-p) of such a pulse on the penetration depth R of the fast particles is studied by two-dimensional simulations of the evolution of a deuterium-tritium fuel, precompressed at density rho, and heated by a beam of particles with assigned R. The ignition windows in the (E-p,W-p,I-p) space are found to depend very little on R over the interval 0.15 less than or equal to R less than or equal to 1.2 g/cm(2). At rho=300 g/cm(3), the minimum ignition energy is about 14 kJ; an optimal set of parameters (with energy and power about the required minimum, and intensity relatively close to the minimum) is E(p)congruent to 17 kJ, W(p)congruent to 0.85x10(15) W, and I(p)congruent to 6.5x10(19) W/cm(2) (achieved at R=0.6 g/cm(2)). The optimal energy scales with the density as E(p)proportional to rho(-1.85). Scaling laws are also presented for the other pulse parameters and for the limiting energy gain. (C) 1999 American Institute of Physics. [S1070-664X(99)01907-2].