The European High Power laser Energy Research (HiPER) project aims at demonstrating the feasibility of high gain inertial confinement fusion using the fast ignitor approach. A baseline target has been recently developed by Atzeni et al (2007 Phys. Plasmas14 052702). We study here the robustness of this target during the compression phase and define pulse shape tolerances for a successful fuel assembly. The comparison between a standard and a relaxation pulse shows that the latter allows one to reduce both the laser power contrast and the growth of perturbations due to Rayleigh–Taylor instability. We have found that with 95 kJ of absorbed laser energy one can assemble the fuel with a peak density around 500 g cm−2 and a peak areal density of 1.2 g cm−2. This implies a total target gain of about 60.
欧州高功率激光（HiPER）项目旨在论证采用快速点火方式的惯性约束聚变实现高增益的可行性。最近，Atzeni等人（2007 Phys. Plasmas 14 052702）开发了一个基准靶。我们研究了该靶在压缩阶段的鲁棒性，并定义了成功实现燃料组装的脉冲波形容差。对标准脉冲和弛豫脉冲的比较表明，后者能够同时降低激光功率对比度以及由瑞利-泰勒不稳定性引起的扰动增长。我们发现，在吸收激光能量为95 kJ的条件下，可以实现燃料组装，其峰值密度约为500 g cm⁻³，峰值面密度为1.2 g cm⁻²。这意味着靶的总增益约为60。