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The momenta of charged particles will be determined from their curvature in the 2T magnetic field provided by a 2.8m long solenoid magnet. The superconducting (SC) solenoid, a two layer coil with mean radius of 60cm, has a stored energy of 5MJ (for reference the CDF coil is 30MJ). Inside the tracking volume the value of sin$\theta \times \int {\rm B}_z{\rm d}l$ along the trajectory of any particle reaching the solenoid is uniform to within 0.5%. This uniformity is achieved in the the absence of a field-shaping iron return yoke by using two grades of conductor with higher current density near the ends of the coil. From the value of the field integral and the space point precision provided by the silicon and fiber tracking system, $\Delta p_T/{p_T}^2\approx0.002$. The SC coil plus cryostat is about 1.1 radiation lengths thick.
The solenoid is being built by Toshiba Corp. in Yokohama, Japan. They are under contract to provide the solenoid as specified by Fermilab. The contract was awarded in January 1995 and Toshiba presented its preliminary design to Fermilab in mid-March. Delivery of the magnet to Fermilab will occur in late 1996 after complete testing in Japan.
The cryogenic plant that supplies LHe for both the solenoid and the visible light photon counter (VLPC) readout devices is in the final stages of design and the initial stages of construction. After appropriate modifications to the D0 cryogenic services building, the Accelerator Division (AD) will provide the experiment with warm high pressure He. The expansion engines and heat exchangers, etc. used in making LHe, will be located in the D0 Assembly Hall. Modifications to the AD0 cryo building will begin in the 1995 summer shutdown.