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dc and ac magnetic properties of two thin-walled superconducting Nb cylinderswith a rectangular cross-section are reported. Magnetization curves and the acresponse were studied on as-prepared and patterned samples in magnetic fieldsparallel to the cylinder axis. A row of micron-sized antidots (holes) was madein the film along the cylinder axis. Avalanche-like jumps of the magnetizationare observed for both samples at low temperatures for magnetic fields not onlyabove $H_{c1}$, but in fields lower than $H_{c1}$ in the vortex-free region.The positions of the jumps are not reproducible and they change from oneexperiment to another, resembling vortex lattice instabilities usually observedfor magnetic fields larger than $H_{c1}$. At temperatures above $0.66T_c$ and$0.78T_c$ the magnetization curves become smooth for the patterned and theas-prepared samples, respectively. The magnetization curve of a referenceplanar Nb film in the parallel field geometry does not exhibit jumps in theentire range of accessible temperatures. The ac response was measured inconstant and swept dc magnetic field modes. Experiment shows that ac losses atlow magnetic fields in a swept field mode are smaller for the patterned sample.For both samples the shapes of the field dependences of losses and theamplitude of the third harmonic are the same in constant and swept field near$H_{c3}$. This similarity does not exist at low fields in a swept mode.

dc and ac magnetic properties of thin-walled Nb cylinders with and without a row of antidots