Characterization of self-generated E and B Fields in the coronae of direct-drive implosions at OMEGA*

Self-generated electric and magnetic fields in direct-drive ICF implosions are caused by for instance plasma pressure gradients and the Biermann battery effect. These fields may affect the implosion by redirecting heat flows, seeding and amplifying hydrodynamic instabilities, and modifying hot electron transport. However, the precise nature of experimentally observed field structures is poorly understood. To determine the structure and effects of the fields, target normal sheath acceleration-based proton radiographs were obtained from exploding pusher implosion experiments conducted at OMEGA. We use the proton radiographs and reconstructions of the electric and magnetic fields from them, in concert with numerical simulations to assess potential field generation mechanisms in the corona.