Development of a \hbox\hbox and \hbox\hbox Subscale Magnet

A 13 T class Nb 3 Al and Nb 3 Sn subscale magnet has been in development at the High Energy Accelerator Research Organization (KEK) to establish technology for a high-field accelerator magnet. The magnet was designed to generate a high magnetic field efficiently in a minimum-gap, common coil configuration with 200-mm-long racetrack coils. Two of the five coils in the magnet are Nb 3 Sn-produced by Lawrence Berkeley National Laboratory. The other three coils are Nb 3 Al -produced by KEK. The Nb 3 Al Rutherford cables are comprised of 28 RHQ-Nb 3 Al wires and were developed at KEK in collaboration with National Institute for Materials Science and Fermi National Accelerator Laboratory. Presently, the fabrication of two double pancake Nb 3 Al coils with the same configuration of 13 turns per layer was completed using the wind and react method. The magnet assembly and the preparations for excitation tests are currently in progress.