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A thin superconducting solenoid has been designed for an upgrade to the Fermilab D detector, one of two major hadron collider detectors at Fermilab. The original design of the D detector did not incorporate a central magnetic eld which necessitates a retro t within the parameters of the existing tracking volume of the detector. The two l a yer solenoid coil is indirectly cooled and provides a 2 T magnetic eld for a central tracking system. To minimize end e ects in this no iron con guration, the conductor width is varied thereby increasing current density at the ends and improving eld uniformity. This paper summarizes the results of the conceptual design study for the D superconducting solenoid.

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