A remarkable ion energy control is demonstrated by several-stage post-acceleration in a laser plasma interaction. Intense short-pulse laser generates a strong current by high-energy electrons accelerated. The strong electric current creates a strong magnetic field. During the increase phase of the magnetic field, the longitudinal inductive electric field is induced for the forward ion acceleration. The inductive acceleration and the target-normal sheath acceleration in the multi stages provide a unique controllability of the ion energy and its energy spectrum. By the four-stage successive acceleration, our 2.5-dimensional particle-in-cell simulations demonstrate that the maximum proton energy reaches 254MeV.
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