Abstract
Collaboration exists between NSCL and JLab to developing the reference design of JLab's super high momentum spectrometer (SHMS) horizontal bend magnet. A Superconducting "C"type, superferric dipole magnet that allows the SHMS to reach small forward angles without restricting the SHMS's acceptance, degree of motion or range of particle energy is presented. Spatial requirements for the coexistence of the SHMS at forward angles of -5.5deg along with the existing high momentum spectrometer (HMS) at 12deg to the primary beam line give rise to close tolerances on design parameters. The bending of 12 Gev/c particles by 3deg requires an integral field strength up to 2.1 T.m. The current design is "warm-iron" with a nominal yoke length of 600 mm and a minimum pole gap of 350 mm. Choice of superconducting conductor, between surplus re-flattened SSC NbTi Rutherford cable that provides plenty of current margin and cost savings and Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn cable, noted for its temperature margin will be highlighted. Coil forces, coil restraint system, energy margins, hot spot and final temperatures, beam radiated heating and superconducting stability will also be presented.
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