Recently, radiation pressure acceleration (RPA) has been proposed and extensively studied, which shows circularly polarized (CP) laser pulses can accelerate mono-energetic ion bunches in a phase-stable-acceleration (PSA) way from ultrathin foils. It is found that self-organizing proton beam can be stably accelerated to GeV in the interaction of a CP laser with a planar target at ≈ 10~(22) W/cm~2. A project called Compact LAser Plasma Proton Accelerator (CLAPA) is approved by MOST in China recently. A prototype of laser driven proton accelerator (1to15MeV/1Hz) based on the Phase Stability Acceleration (PSA) mechanism and plasma lens is going to be built at Peking University in the next five years. It will be upgraded to 200MeV later for the applications such as cancer therapy, plasma imaging and fast ignition for inertial confine fusion.
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