Some features of superconducting dual bore lens

Design of dual bore superconducting quadrupole for CESR upgrade is represented. The lens has a gradient about 1 kG/cm, dual aperture of 54 mm each, length about 800 mm, The axes spacing about 80 mm allows a good separation of counter rotating beams. The harmonics content measured below 0.05%. Some concepts used in this dual bore lens could be used for design of any multi aperture lens, where high field quality is required.