Abstract. Flux penetrations into three-dimensional Nb superconducting strip arrays, where two layers of strip array are stacked by shifting a half period, are studied by using magneto-optical imaging method. Flux avalanches are observed when the overlap between the top and bottom layers is large even if the width of each strip is well below the threshold value. In addition, anomalous linear avalanches perpendicular to the strip are observed in the shifted strip array when the overlap is very large and the thickness of superconductor is greater than the penetration depth. We discuss possible origins of the flux avalanches including the linear ones by considering the flux penetration calculated by the Campbell method assuming the Bean model.
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