Target designs that utilize heavy-ion beams with two substantially different particle energies are presented. Low-energy ions of moderate power are used to directly drive a spherical-shell target that is cryogenically layered with a deuterium-tritium (DT) mixture. The purpose of this first pulse is to compress the DT fuel and tamper; compressions of a hundred to a few hundred times solid density appear possible. Following compression the target is irradiated with a high-particle energy and high-power pulse. The main purpose of the second pulse is to bring the central DT region to ignition. Additional compression of no more than 10 is needed. For targets with a low-Z pusher, gains greater than a hundred are possible with an ignition pulse of 1000 TW and a heavy-ion particle energy of 40 GeV. Pulse requirements, finite focusing effects, and symmetry requirements are discussed.
提出了利用具有两种截然不同粒子能量的重离子束轰击靶丸的设计方案。首先，采用中等功率的低能离子束直接驱动球形靶丸，该靶丸低温分层含有氘氚（DT）混合物。第一脉冲的目的是压缩DT燃料及烧蚀层，压缩倍数可达固体密度的100至数百倍。压缩后，靶丸受到高功率、高能粒子束的照射。第二脉冲的主要目的是使中心DT区域达到点火条件。所需额外压缩不超过10倍。对于低Z烧蚀层靶丸，若点火脉冲功率为1000太瓦、重离子能量为40吉电子伏，则能量增益可超过100倍。文中讨论了脉冲要求、有限聚焦效应及对称性要求。