Directly measuring DD-produced proton spectra in ICF implosion

A method to directly measure the DD-produced proton spectra is proposed and applied to an ICF implosion experiment. This method is based on the CR39 responding curve. It is designed to get higher counts, and it is suitable for low proton yield cases. Before the experiment, CR39 is calibrated and the background is measured to increase the accuracy. After the experiment，the CR39 responding curve is used to clarify the primary proton energy, and the Geant4 is used to modified the membrane effect. The implosion areal density which is propitious to further analyze implosion experiment results is obtained by measuring the proton spectrum peak shift.