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{\rm Nb}_{3}{\rm Sn} Accelerator Magnet Technology Scale Up Using Cos-Theta Dipole Coils

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19 Author(s)
Nobrega, F. ; Fermi Nat. Accel. Lab., Batavia, IL ; Andreev, N. ; Ambrosio, G. ; Barzi, E.
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Fermilab is working on the development of accelerator magnets using shell-type dipole coils and the wind-and-react method. As a part of the first phase of technology development, Fermilab built and tested six 1 m long dipole model magnets and several dipole mirror configurations. The last three dipoles and two mirrors reached their design fields of 10-11 T. The technology scale up phase has started by building 2 m and 4 m dipole coils and testing them in a mirror configuration in which one of the two coils is replaced by a half-cylinder made of low carbon steel. This approach allows for shorter fabrication times and extensive instrumentation preserving almost the same level of magnetic field and Lorentz forces in the coils as in a complete dipole model magnet. This paper presents details on the 2 m (HFDM07) and 4 m long (HFDM08) dipole mirror magnet design and fabrication technology, as well as the magnet test results which are compared with 1 m long models.

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Applied Superconductivity, IEEE Transactions on  (Volume:18 ,  Issue: 2 )