Abstract: A generator of single wall domains, i.e., bubbles, for a bubble memory system is disclosed. The generator includes a closed feed ring, constructed of a repetitive pattern of magnetically soft chevrons, having merging input and output channels of similar chevron design. A nucleator in the input channel, driven at one-half the frequency of the rotating in-plane field, generates a bubble every other cycle of the in-plane field frequency such that only alternate positions along the input channel, and correspondingly the feed ring, are initially filled with bubbles. The bubbles, as driven around the four 90.degree. corners of the feed ring, are delayed one complete cycle of the in-plane field frequency such that the generated bubbles from the input channel and the bubbles in the feed ring fill alternate positions along the feed ring. Thus, after the first generated bubble completes two complete cycles of the feed ring, the feed ring is filled.