Measurement of x-ray and DTn emission histories from OMEGA cryogenic and surrogate implosions with 10 ps relative timing accuracy*

The x-ray and DTn emission histories were simultaneously measured with 10 ps relative timing accuracy on OMEGA surrogate Inertial Confinement Fusion (ICF) implosions. These implosions use a plastic ablator that is mass equivalent to the DT fuel in an OMEGA cryo implosion. An identical laser pulse is also used for these implosions. Measurements were made using a new diagnostic configuration which utilizes 4 fast-rise scintillators coupled to a shielded optical streak camera. This design allows time resolved measurement of x-ray emission in 3 different energy bands and DTn emission on a single streak. The uncertainty of the relative timing between the x-ray and DTn histories is only 10 ps as they are captured on a single diagnostic. This is the highest resolution measurement of the relative timing between these two emissions which will allow detailed studies of hot-spot dynamics near bang time of ICF implosions. Preliminary results indicate that the peak emissions of DTn and x-rays occur nearly simultaneously while average-ion hydrodynamic simulations predict that the x-ray emission is delayed by 20 ps. The same diagnostic configuration has been used to measure the DTn emission histories on OMEGA cryo implosions. This work was supported in part by the US DOE, LLE, LLNL, and DOE NNSA Center of Excellence.