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The generation of fast ion beams in the hole-boring radiation pressureacceleration by intense laser pulses has been studied for targets withdifferent ion components. We find that the oscillation of the longitudinalelectric field for accelerating ions can be effectively suppressed by using atwo-ion-species target, because fast ions from a two-ion-species target aredistributed into more bunches and each bunch bears less charge. Consequently,the energy spread of ion beams generated in the hole-boring radiation pressureacceleration can be greatly reduced down to 3.7% according to our numericalsimulation.

Reducing ion energy spread in hole-boring radiation pressure acceleration by using two-ion-species targets