A model for fast electron-driven high-density plasma in the double-cone ignition scheme

A model for fast electron-driven high-density plasma is proposed to describe the effect of injected fast electrons on the temperature and inner pressure of the plasma in the fast heating process of the double-cone ignition(DCI)scheme.Due to the collision of the two low-density plasmas,the density and volume of the high-density plasma vary.Therefore,the ignition temperature and energy requirement of the high-density plasma vary at different moments,and the required energy for hot electrons to heat the plasma also changes.In practical experiments,the energy input of hot electrons needs to be considered.To reduce the energy input of hot electrons,the optimal moment and the shortest time for injecting hot electrons with minimum energy are analyzed.In this paper,it is proposed to inject hot electrons for a short time to heat the high-density plasma to a relatively high temperature.Then,the alpha particles with the high heating rate and PdV work heat the plasma to the ignition temperature,further reducing the energy required to inject hot electrons.The study of the injection time of fast electrons can reduce the energy requirement of fast electrons for the high-density plasma and increase the probability of successful ignition of the high-density plasma.

Suppression of the Kelvin-Helmholtz instability by coating in the double-cone ignition scheme

In order to address the issue of gold mixing caused by the Kelvin-Helmholtz instability(KHI)in the double-cone ignition(DCI)scheme,we investigate the growth rate of the KHI at the bi-interface of the DCI scheme after applying a coating.This is done by solving the hydrodynamic equations for an ideal incompressible fluid using linear theory.Ultimately,it is discovered that applying a coating with a thickness slightly above h=0.5(λ+10μm)and a density somewhat lower than that of the target layer can effectively reduce the growth rate of interfacial KHI.This work provides theoretical references for studying the bi-interface KHI in the DCI scheme.

Radiation Hydrodynamic Simulations in the Planar Scheme for the Fundamental Studies of Shock Ignition

As a fundamental and crucial research topic in the direct-driven inertial confinement fusion（ICF）,especially for shock ignition（SI）,investigation on the laser coupling with planar lowZ targets is beneficial for deep physical comprehension at the primary phase of SI.The production of the intense shock and the shock coalescence in the multi-layer targets,driven by the 3ω intense laser（351 nm the wavelength）,were studied in detail with the 1D and 2D radiation hydrodynamic simulations.It was inferred that the 1D simulation would overrate the shock velocity and the ablation pressure of the spike;the coalescence time and the velocity of the coalescence shock depended evidently on the pulse shape and the start time of the spike.The present study can also provide a semi-quantitative reference for the design of the SI decomposition experiments on the Shenguang-III prototype laser facility.