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A new concept is proposed for accelerating positrons in a nonlinear plasmawakefield accelerator. By loading the wakefield (back of the plasma bubble)with a short electron bunch, an extended area of excessive plasma electronaccumulation is created after the first bubble, resulting in a favorable regionwith simultaneous focusing and accelerating fields for positrons. Scaling lawsfor optimized loading parameters are obtained through extensive parametersscans. Owing to the good quality of the focusing field, positron accelerationwith emittance preservation can be achieved in this new regime and it has beendemonstrated in the three-dimensional particle-in-cell simulations.

Positron Acceleration in an Elongated Bubble Regime