Diagnosing Inertial Confinement Fusion Implosions Using the D3He Spectrum Line Width at OMEGA and the NIF

Alex Zylstra, Massachusetts Institute of Technology

Wedge Range Filter (WRF) spectrometers are used to diagnose implosions containing D and 3He gas through measurements of the proton spectrum [D+3He → p (14.7 MeV) + 4He (3.6 MeV)]. The total line width is due to the thermal Doppler broadening, instrumental broadening, and several other effects. The significances of these sources of broadening are calculated using a Monte Carlo code. Using this code we constrain the ion temperature in OMEGA exploding pusher shots. Alternatively, we constrain the amplitude of high-mode asymmetries in a NIF implosion from the previous campaign (N091123), and will apply these models to D3He exploding pushers on the NIF during the Magnetic Recoil Spectrometer (MRS) calibration.

Abstract Author(s): A. B. Zylstra, M. Rosenberg, N. Sinenian, C. Li, F. Seguin, J. Frenje, R. Petrasso (MIT) R. Rygg, D. Hicks, S. Friedrich, O. Landen, A. Mackinnon (LLNL) J. Kilkenny (GA) C. Sangster, V. Glebov, C. Stoeckl (LLE)