A superconducting 40 kG magnet system 4 meters long is now operating which bends the 30 billion electron volt primary proton beam produced by the Brookhaven Alternating Gradient Synchrotron. The magnet design is unique in that commercially available niobium titanium composite superconductor and relatively high purity aluminum are used in combination with low carbon steel magnet cores to provide excellent magnetic and thermal stabilization. This magnet system is operating on line in a closed loop, zero loss helium refrigeration system. Details of the magnet structure, dewars, and cryogenic system will be discussed.

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