Preliminary Diagnosis of Areal Density in the Deuterium Fuel Capsule by Proton Measurement at SG-III Facility

Areal density (rho R) is one of the crucial parameters in the inertial confinement fusion. Measurement of the fusion products is a more feasible method to diagnose rho R than other methods, such as X-ray. In the capsules filled with D-2 fuel or D-He-3 fuel, proton is an ideal probe to diagnose the implosion rho R in different emission times and directions by measurements of the proton yields and spectra. By D-D reaction protons and D-3He reaction protons, the diagnostics of the total and fuel rho R, rho R evolution, implosion asymmetry and mix effect have been demonstrated at OMEGA and NIF facilities. Also some advanced proton diagnostics instruments are developed with a high level capability. Preliminary diagnosis of rho R in the deuterium involved fuel capsules by measurement of protons at SG-III facility was implemented. A fusion product emission and transport code by Monte-Carlo method was developed. The primary and secondary protons emission and transport in the fuel and shell plasmas were able to be simulated. The relations of the proton energy loss and the secondary proton yields with the areal density were inspected. Several proton spectrometers have been built up at SG-III facility, such as a step ranged filter (SRF) proton spectrometer and a wedged range filter (WRF) proton spectrometer. Some proton response simulation codes and the codes for proton spectra reconstruction were also developed. The demonstrations of rho R diagnostics at SG-III facility by D-D reaction and D-He-3 reaction proton spectra measurements are presented.