T-duality on the supertube

In this talk we find some configurations which exhibit 'supertube' effect. These configurations are obtained by performing T-duality transformations on the supertube along various directions. T-duality along directions transverse to the supertube gives us the result: when an array of Dp-branes are threaded vertically by superstrings over the entire volume of Dp-branes, it is 'blown-up' to D(p+2)-brane. Especially we show, by T-duality along the axial direction of supertube, that the 'blown-up' configuration is a helical D1-brane, which is Self-supported from collapse by the axial momentum flow, preserving one quarter of the supersymmetry of the IIB Minkowski vacuum.