(a), (b) The cross sections perpendicular and parallel to the cylinder channel, where α is the included angle between the normal direction of ellipsoid of the helix structure and the z-axis. (c)–(e) Variation of 〈cos(α)〉 with chain stiffness parameter b under different action radius R = 2, 3, and 4, where each has several curves for different chain monomer number N.