Modeling of Target Offset in Warm Implosions on OMEGA

In inertial confinement fusion, small errors in capsule positioning within the target chamber have been identified through simulations as a significant source of implosion nonuniformity and yield degradation. However, neutron yields from both warm and cryogenic implosions on the OMEGA‑60 Laser System have exhibited little sensitivity to target offset. This talk will present 2-D simulations showing that cross-beam energy transfer plays a large role in mitigating laser drive asymmetry from target offset. A comparison of simulated and experimental observables is presented for warm target implosions. These observables include bulk hot-spot flow as measured by neutron time-of-flight diagnostics, variations in the observed ion temperature as a function of line of sight, and x-ray images both in-flight and at stagnation time.