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arXiv 1602.02530physics.plasm-ph
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团簇尺寸和空间laser强度分布对laser驱动氘团簇产生聚变中子的影响

Effects of cluster size and spatial laser intensity distribution on fusion neutron generation by laser driven Deuterium clusters

Gaurav Mishra, Amol R. Holkundkar

摘要:

采用三维分子动力学程序研究了飞秒脉冲近红外激光驱动氘团簇库仑爆炸产生聚变中子的过程。我们考虑了平均尺寸为80,140,200 μ m的各种团簇,它们被峰值时空强度为1 $\langle R_0\rangle$的激光照射。通过对团簇单强度离子能量分布函数(IEDF)在不同团簇尺寸和激光强度范围内的卷积,研究了团簇尺寸和激光强度空间分布对团簇库仑爆炸离子能量的影响.由于这个过程,最终的卷积IEDF在较低和较高能量侧都变宽。此外,与忽略卷积效应的情况相比,考虑卷积IEDF的中子产额也被修改了$\sim$ 2倍。

英文摘要:

A three dimensional molecular dynamic code is used to study the generation of fusion neutrons from Coulomb explosion of Deuterium clusters driven by intense near infra-red (NIR) laser ($λ=800nm$) of femtosecond pulse duration ($τ=50 fs$) under beam-target interaction scheme. We have considered various clusters of average sizes ($\langle R_0\rangle$=80,140,200Å) which are irradiated by a laser of peak spatial-temporal intensity of 1$\times10^{18} W/cm^{2}$. The effects of cluster size and spatial laser intensity distribution on ion energies due to the Coulomb explosion of the cluster are included by convolution of single cluster single intensity ion energy distribution function (IEDF) over a range of cluster sizes and laser intensities. The final convoluted IEDF gets broadened on both lower and higher energy sides due to this procedure. Furthermore, the neutron yield which takes into account the convoluted IEDF, also gets modified by a factor of $\sim$2 compared to the case when convolution effects are ignored.

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