惯性约束聚变中黑腔能量亏损问题研究进展OA

In indirect-drive laser inertial confinement fusion(ICF),the precise calculation of X-ray drive intensity at the capsule is crucial for accurately predicting the implosion performance of deuterium-tritium fuel capsules.Achieving this requires detailed radiation-hydrodynamic simulations that accurately capture processes such as laser-to-X-ray conversion and X-ray absorption losses at the hohlraum walls.However,since the inception of the National Ignition Campaign at the National Ignition Facility(NIF),radiation-hydrodynamic simulations have consistently overestimated the experimentally measured X-ray drive flux intensity at the capsule,reflecting the widespread presence of hohlraum energy deficits.Although extensive experimental studies have been conducted at NIF along with continuous optimization of its radiation-hydrodynamic simulation models,the challenging issue of hohlraum energy deficit remains unresolved,constituting one of the critical barriers to achieving high-gain inertial confinement fusion.This paper systematically reviews the critical research developments regarding hohlraum energy deficit at NIF and introduces the methods adopted by NIF and China for characterizing the X-ray radiation flux intensity at the capsule.