Tahir NA, Hoffmann DH, Kozyreva A, Shutov A, Maruhn JA, Neuner U, Tauschwitz A, Spiller P, Bock R
Institut fur Kernphysik, Technische Universitat Darmstadt, Schlossgarten Strasse 9, D-64289 Darmstadt, Germany.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 2000 Jul;62(1 Pt B):1224-33. doi: 10.1103/physreve.62.1224.
This paper presents two-dimensional numerical simulations of the hydrodynamic response of solid as well as hollow cylindrical targets made of lead that are irradiated by an intense beam of uranium ions which has an annular focal spot. Using a particle tracking computer code, it has been shown that a plasma lens can generate such a beam with parameters used in the calculations presented in this paper. The total number of particles in the beam is 2x10(11) and the particle energy is about 200 MeV/u that means a total energy of approximately 1.5 kJ. This energy is delivered in a pulse that is 50 ns long. These beam parameters lead to a specific energy deposition of 50-100 kJ/g and a specific power deposition of 1-2 TW/g in solid matter. These calculations show that in case of the solid lead cylinder, it may be possible to achieve more than 4 times solid lead density along the cylinder axis at the time of maximum compression. The pressure in the compressed region is about 20 Mbar and the temperature is a few eV. In the case of a hollow cylinder, one also achieves the same degree of compression but now the temperature in the compressed region is much higher (over 10 eV). Such samples of highly compressed matter can be used to study the equation-of-state properties of high-energy-density matter. It is expected that by the end of the year 2001, after completion of the upgrade of the existing facilities, the above beam parameters will be available at the Gesellschaft fur Schwerionenforschung (GSI), Darmstadt. This will open up the possibility to carry out very interesting experiments on a number of important problems including the investigation of the EOS of high-energy-density matter.
本文展示了对由铅制成的实心以及空心圆柱形靶的流体动力学响应的二维数值模拟，这些靶受到具有环形焦点的强铀离子束的辐照。使用粒子追踪计算机代码表明，等离子体透镜可以产生具有本文计算中所使用参数的这样一束离子束。束中的粒子总数为2×10¹¹，粒子能量约为200MeV/u，这意味着总能量约为1.5kJ。该能量在一个50ns长的脉冲中传递。这些束参数导致在固体物质中的比能量沉积为50 - 100kJ/g，比功率沉积为1 - 2TW/g。这些计算表明，对于实心铅圆柱体，在最大压缩时沿圆柱体轴线可能实现超过4倍的固体铅密度。压缩区域的压力约为20Mbar，温度为几电子伏特。对于空心圆柱体，也能达到相同程度的压缩，但此时压缩区域的温度要高得多（超过10eV）。这种高度压缩物质的样本可用于研究高能量密度物质的状态方程特性。预计到2001年底，在现有设施升级完成后，上述束参数将在达姆施塔特的重离子研究协会（GSI）可用。这将为开展许多重要问题的非常有趣的实验开辟可能性，包括对高能量密度物质状态方程的研究。
