Charged-particle spectrometry at the NIF and OMEGA
Our Charged-Particle Spectrometry program is designed to provide diagnostic information about ICF plasmas by measuring energy spectra of charged fusion products and ablator ions. These measurements provide fusion yields, ion temperatures, areal density and areal density symmetry of fuel and shell, stopping power in hot plasmas, and quantification of anomalous acceleration effects. Two magnet-based spectrometers [see here] at OMEGA, and many compact “wedge-range-filter” proton spectrometers [see here, here, and here] are used at OMEGA and at the NIF. Measured spectra include lines of D3He protons (14.7 MeV) and alphas (3.6 MeV), DT alphas (3.5 MeV), and DD protons (3.0 MeV), tritons (1.0 MeV), and 3He (0.8 MeV), T-3He deuterons (9.5 MeV), and continuous “knock-on” spectra of deuterons, tritons, and protons ejected in elastic collisions with 14-MeV fusion neutrons.