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The transverse stability of the target is crucial for obtaining high qualityion beams using the laser radiation pressure acceleration (RPA) mechanism. Inthis letter, a theoretical model and supporting two-dimensional (2D)Particle-in-Cell (PIC) simulations are presented to clarify the physicalmechanism of the transverse instability observed in the RPA process. It isshown that the density ripples of the target foil are mainly induced by thecoupling between the transverse oscillating electrons and the quasi-staticions, a mechanism similar to the transverse two stream instability in theinertial confinement fusion (ICF) research. The predictions of the modestructure and the growth rates from the theory agree well with the resultsobtained from the PIC simulations in various regimes, indicating the modelcontains the essence of the underlying physics of the transverse break-up ofthe target.

Physical mechanism of the transverse instability in radiation pressure ion acceleration