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Laser-driven proton acceleration from novel cryogenic hydrogen target of thethickness of tens of microns irradiated by multiPW laser pulse is investigatedhere for relevant laser parameters accessible in near future. It isdemonstrated that the efficiency of proton acceleration from relatively thickhydrogen solid ribbon largely exceeds the acceleration efficiency for a thinnerionized plastic foil, which can be explained by enhanced hole boring driven bylaser ponderomotive force in the case of light ions and lower target density.Three-dimensional (3D) particle-in-cell (PIC) simulations of laser pulseinteraction with relatively thick hydrogen target show larger energies ofprotons accelerated in the target interior during the hole boring phase andreduced energies of protons accelerated from the rear side of the target byquasistatic electric field compared with the results obtained fromtwo-dimensional (2D) PIC calculations. Linearly and circularly polarizedmultiPW laser pulses of duration exceeding 100 fs show similar performance interms of proton acceleration from both the target interior as well as from therear side of the target. When ultrashort pulse ($\sim$ 30 fs) is assumed, thenumber of accelerated protons from the target interior is substantiallyreduced.

Dominance of hole-boring radiation pressure acceleration regime with thin ribbon of ionized solid hydrogen