Onset of Coherent Electromagnetic Structures In the REB-DT Fuel Interaction for Fast Ignition

We stress the combinations of swiftly growing electromagnetic instabilities(EMI) arising in the interaction of relativistic electron beams(REB) with precompressed DT fuels of fast ignition interest for ICF.REB-target system is taken neutral in charge and current with electron distribution functions including beam and target temperatures.We also pay attention to the impact of modes growth rates(GR) of mode-mode coupling and intrabeam scattering. Collisional damping is documented at large wave numbers in terms of skin depth.A quasi-linear approach yields GR below linear ones.One of the most conspicuous output of this combined linear analysis are 3D ridges featuring the largest GR above k- space for an oblique modes propagagtion w.r.t initial beam velocity. Those modes are seen immune to any temperature induced damping. These novel patterns arise from combining Weibel,filamentation and 2-stream instabilities.They persist in the presence of smooth density gradients or strongly applied magnetic fields. In the very early propagation stage,with no current neutralization,and with strong edge density gradients,REB show a typical ringlike and regularly spiked pattern in agreement with recent experimantal and simulation results.