High yields in direct-drive inertial confinement fusion using thin-ice DT liner targets

We report simulation results that suggest record neutron yields above 3 x 10 14 can be achieved in laser-driven fusion on OMEGA by imploding large-outer-diameter targets (& SIM;1010 mu m) containing ice layers as thin as 34 mu m. Historically, the performance of thin and fast capsules is thought to be highly degraded by hydrodynamic instabilities. We present pulse designs that push implosion velocities above 650 km / s while maintaining enough ablative stabilization and low enough in-flight aspect ratios to survive the acceleration phase. We show that these targets also possess improved stability during deceleration stemming from augmented core temperatures and low fuel convergence.

Automated summary

Simulation results suggest that achieving record neutron yields in laser-driven fusion on OMEGA is possible using large-outer-diameter targets with thin ice layers. Pulse designs that increase implosion velocities while maintaining stability are crucial for success, and improved stability during deceleration is observed due to enhanced core temperatures and low fuel convergence.