  Optical generation of energetic particle bunches requires high-power laser
facilities operating in picosecond or femtosecond temporal domain. It is
therefore preferable to use short laser pulses in all-optical platforms
designed for guiding and focusing of such particle beams, increasing their
brightness and decreasing their angular divergence. We propose and discuss
theoretical and experimental results for a novel electromagnetic guiding setup
based on a shaped spiral-like 'snail' target with a relatively large useful
aperture. Due to the diameter increased to a sub-mm scale, a wider particle
bunches may be efficiently focused, as we show in theoretical modelling with a
model field distributions, supported by the experimental data.
