D-D proton spectra and emission imaging for diagnosing imploded capsules on Shenguang III laser prototype facility

Understanding and controlling implosion dynamics are critical for progress in inertial confinement fusion (ICF). Primary D-D protons spectra and emission imaging is used for diagnosing areal density and implosion asymmetries on Shenguang III laser prototype facility with low neutron yields for the first time. An accurately calibrated charged particle spectrometer (CPS) is used with CR39 detector for the measurement of the proton spectra. The properties of the noise and proton signal on the CR39 are characterized, and the spectra of the implosion proton are obtained by excluding the noise. For the investigation of the implosion asymmetries, a new method of directly imaging of primary DD protons in the implosion region by miniature magnetic quadrupole lenses is proposed. The imaging properties such as spatial resolution and focus length are investigated by simulation and calibration experiment.