Nb3Sn dipole magnets

Multifilamentary Nb
3
Sn conductors suitable for use in accelerator magnets have been under development at BNL for a number of years. To date three one meter long dipole magnets have been constructed from braided conductor which had been reacted prior to winding. The first of these dipoles and the method of construction has been described in an earlier paper. The most recent magnet in this series was tested over the temperature range 4.2 K to 15 K using high pressure gas cooling. The maximum field 4.8 T, was achieved at 4.2 K. At higher temperatures the field decreased approximately linearly with temperature passing through 4.0 T at just under 8 K.