Measurement of fuel areal density for large laser prototype facility

In the first run of the large laser prototype facility, two sensitive plastic scintillation detectors were used to measure the primary neutron yield and the secondary neutron yield in the implosion experiments. When the primary neutron yield exceeded 108, the secondary neutron yield could be gained. Under the low fuel areal density, the ratio of the secondary neutron yield to the primary neutron yield was used to calculate the fuel areal density. This is the first time that the values of fuel areal density was obtained through this way in China， and the fuel areal density is lower than 4 mg/cm2.