Title: Improving hot-spot pressure for ignition in high-adiabat Inertial Confinement Fusion implosion,
Abstract: A novel capsule target design to improve the hot-spot pressure in the
high-adiabat implosion for inertial confinement fusion is proposed, where a
layer of comparatively high-density material is used as a pusher between the
fuel and the ablator. This design is based on our theoretical finding of the
stagnation scaling laws, which indicates that the hot spot pressure can be
improved by increasing the kinetic energy density $\rho_d V_{imp}^2/2$
($\rho_d$ is the shell density when the maximum shell velocity is reached,
$V_{imp}$ is the implosion velocity.) of the shell. The proposed design uses
the high density pusher to enhance the shell density $\rho_d$ so that the hot
spot pressure is improved. Radio-hydrodynamic simulations show that the hot
spot pressure of the design reaches the requirement for ignition even driven by
a very high-adiabat short-duration two-shock pulse. The design is hopeful to
simultaneously overcome the two major obstacles to achieving ignition--ablative
instability and laser-plasma instability.