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Iron Dominated 2 T Superconducting Dipoles for the Second Folded Segment of the FRIB Folded Linac

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6 Author(s)
Chouhan, S.S. ; FRIB Michigan State Univ., East Lansing, MI, USA ; Green, M.A. ; Binkowski, J. ; DeKamp, J.
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The Facility for Rare Isotope Beams under construction at Michigan State University will be capable of providing beams of any element at energies of at least 200 MeV/u at a beam power of 400 kW. The proposed Facility for Rare Isotope Beams driver linear accelerator has a front end, three linear accelerator segments, two folding sections, and a beam delivery system. Four 45° dipole magnets are required in folding segment 2 for 180° total bend. Both cost and space constraints in the folding section have pushed the requirement of the superconducting dipole peak field from 1.7 to 2.0 T. The design of a warm iron, super-ferric “H” shaped dipole that provides a high field of 2 T and effective length of 2.35 m is presented. One dipole out of the four has full penetration through the outer return yoke to accommodate an additional port for the purpose of connecting to a beam dump. The impact of the hole on field quality is discussed. The other major challenges are tight space constraint in the 180° bend section and the compact cryostat design. This paper presents the magnet design including coil design, coil forces, and coil restraint system. The full mechanical details are also presented.

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Applied Superconductivity, IEEE Transactions on  (Volume:23 ,  Issue: 3 )