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A scenario for the enhanced laser-driven ion acceleration from a thin solidtarget at high laser intensity is considered, where the target is enclosed in areflecting cavity. The laser pulse reflected from the target is redirectedtowards the target by reflection at the inner cavity wall. This scenario isdiscussed in the context of sub-wavelength foil acceleration in the radiationpressure regime, when plasma dynamics is known to be reasonably well describedby the light-sail model. A semi-analytic formula is presented that describesthe effect of cavity reflections in one-dimensional geometry. The effect ofcavity reflections on sub-wavelength foil acceleration is then evaluated fortwo concrete examples of ultra-intense laser pulses of picosecond andfemtosecond duration.

A simple model for cavity-enhanced laser-driven ion acceleration from thin foil targets