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Description
A large-bore Nb3Sn “cable test facility magnet” designed to test advanced cables and inserts in a high transverse background field, is here proposed. The project is funded by the U.S. Department of Energy (DOE) Office of Science (SC). The test facility dipole magnet (TFD) creating the background field is developed at the Lawrence Berkeley National Laboratory (LBNL). In line with the design considerations of LBNL HD2, and CERN-CEA FRESCA2, the TFD magnet is conceived as a block-type dipole, with coils tilted in the ends (flared), and that uses a support structure based on the bladder and key concept using an external aluminum shell. In the axial direction, steel rods and endplates provide the axial support to the coil ends during the powering of the magnet. The TFD magnet creates a maximum field of 15 T at 1.9 K, in a bore of 100 x 150 mm. This paper presents the main engineering design of the magnet, defining the cable, coil layout, winding parameters, and main structural elements. Furthermore, the central aspects of coil fabrication and magnet assembly are also addressed.
This work was supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, through the US Magnet Development Program under contract No. DE-AC02-05CH11231.
