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A \hbox {Nb}_{3}\hbox {Sn} -Based, Model Superconducting Helical Undulator Fabricated Using a Wind and React Process

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11 Author(s)
Majoros, M. ; Dept. of Mater. Sci. & Eng., Ohio State Univ., Columbus, OH, USA ; Sumption, M.D. ; Susner, M.A. ; Bhartiya, S.
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A model helical undulator 250 mm in length, with a period of 14 mm, was designed, fabricated and tested. The helical coil was wound with multifilamentary, internal-Sn type Nba3Sn strand. The 0.7 mm OD strand was insulated with S-glass, wound onto the former, and reacted, after which the coil underwent vacuum epoxy impregnation. The beam aperture was 7 mm, the winding bore diameter was 8 mm, and the OD of the complete winding was 18 mm. The helical poles were made from 1016 low carbon steel, and projected slightly above the coil pack, with an OD of 19.06 mm. The coil Ic and the magnetic field in the bore were measured at 4.2 K in a liquid helium bath. The bore field was also measured as a function of position along the length of the undulator.

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Applied Superconductivity, IEEE Transactions on  (Volume:20 ,  Issue: 3 )