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We study transverse and longitudinal electron heating effects on the targetstability and the ion spectra in the radiation pressure dominated regime of ionacceleration by means of multi dimensional particle-in-cell (PIC) simulations.Efficient ion acceleration occurs when the longitudinal electron temperature iskept as low as possible. However, tailoring of the transverse electrontemperature is required in view of suppressing the transverse instability,which can keep the target structure intact for longer duration during theacceleration stage. We suggest using the surface erosion of the target toincrease the transverse temperature, which improves both the final peak energyand the spectral quality of the ions in comparison with a normal flat target.

Stabilized Radiation Pressure Dominated Ion Acceleration from Thin-foil Targets