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The excitation of a non-linear ion-wake by a train of ultra-relativisticelectron bubble wake [1]-[8] is modeled. The ion-wake is shown to be a drivennon-linear ion-acoustic wave in the form of a cylindrical ion-soliton[11]-[14]. The phases of the oscillating radial electric fields of theslowly-propagating [21] electron bubble is asymmetric in time and excitestime-averaged inertial ion motion radially. The electron compression in theback of the bubble sucks-in the ions and the space-charge within the bubblecavity expels them, driving a cylindrical ion-soliton structure with on-axisand bubble-edge density-spikes [5][6]. Once formed, the channel-edgedensity-spike is driven radially outwards by the thermal pressure of the wakeenergy [12]. Its channel-like structure due to the flat-residue left behind bythe propagating ion-soliton, is independent of the energy-source driving thebubble [3][4] electron wake. We explore the use of the partially- filledchannel formed by the cylindrical ion-soliton for a novel regime of positronacceleration [18]. OSIRIS PIC [25] simulations are used to study the ion-wakesoliton structure, its driven propagation and its use for positronacceleration.

Non-linear Ion-wake Excitation by Ultra-relativistic Electron Wakefields