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The influence of a periodic landscape of pinning sites on the vortex dynamicsin Pb thin films is explored by ac-susceptibility measurements. For differentamplitudes h of the ac-drive, the ac-susceptibility x=x'+ix'' exhibits acomplex field dependence associated with different dynamic regimes. At very lowac-drives where both, multiquanta vortices trapped by the antidots andinterstitial vortices oscillate inside the pinning potential (intra-valleymotion), a small kink in x'(H) together with a very low dissipation isobserved. At intermediate ac-excitations such that vortices in the antidotsremain pinned whereas interstices are driven out of the pinning well, a morepronounced kink in the screening coinciding with the onset of dissipation(x''(H) ~ 0) indicates the entrance of interstitial vortices. Eventually, athigh enough amplitudes all vortices are set in motion and the penetration ofinterstitial vortices appears as a sudden reduction of the shielding power. Weshow that these distinctive features allow us to clearly identify the maximumnumber of flux quanta per hole regardless the vortex dynamic regime.Comment: 6 pages, 3 figures, to be published in Phys. Rev.

Experimental determination of the number of flux lines trapped by microholes in superconducting samples