Design of an Indirect-Drive Pulse Shape for ～1.6 MJ Inertial Confinement Fusion Ignition Capsules

We present a design of indirect-drive pulse shape for inertial confinement fusion ignition capsules using laser energy 1.6 MJ with a moderate gain (～10) on the Shenguang IV laser facility. The trade-off fuel compression (pressure) for resistance to the hydrodynamic instability (HI) in the recent high-foot (HF) implosion campaign Dittrich T R et al Phys. Rev. Lett. 112 (2014) 055002 is recovered. The proposed design modifies the "main" pulse shape, which features a decompression-recompression step for the fuel shell resulting in higher areal density than that of the "simple" HF design, and thereby approaches the conditions required for ignition avoiding at the expense of more laser energy while holding the HI under control.