Common coil magnet program at BNL

The goal of the common coil magnet R&D program at Brookhaven National Laboratory (BNL) is to develop a 12.5 T, 40 mm aperture dipole magnet using "react and wind technology" with high temperature superconductors (HTS) playing a major role. Due to its "conductor friendly" nature, the common coil design is attractive for building high field 2-in-1 dipoles with brittle materials such as HTS and Nb/sub 3/Sn. At the current rate of development, it is expected that a sufficient amount of HTS with the required performance would be available in a few years for building a short magnet. In the interim, the first generation dipoles will be built with Nb/sub 3/Sn superconductor. They will use a "react and wind" technology similar to that used in HTS and will produce a 12.5 T central field in a 40 mm aperture. The Nb/sub 3/Sn coils and support structure of this magnet will become a part of the next generation hybrid magnet with inner coils made of HTS. To develop various aspects of the technology in a scientific and experimental manner, a 10-turn coil program has been started in parallel. The program allows a number of concepts to be evaluated with a rapid throughput in a cost-effective way. Three 10-turn Nb/sub 3/Sn coils have been built and one HTS coil is under construction. The initial test results of this "react and wind" 10-turn coil program are presented. It is also shown that a common coil magnet design can produce a field quality that is as good as a conventional cosine theta design.

[1]  W. Sampson,et al.  A common coil magnet for testing high field superconductors , 1999, Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366).

[2]  T. Hasegawa,et al.  Improvement of superconducting properties of Bi-2212 round wire and primary test results of large capacity Rutherford cable , 2001 .

[3]  R. Gupta,et al.  A common coil design for high field 2-in-1 accelerator magnets , 1997, Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167).

[4]  V. Kashikhin,et al.  Development of react and wind common coil dipoles for VLHC , 2001 .

[5]  J. Swanson,et al.  Fabrication and Test of Nb3Sn Racetrack Coils at Hieh Field , 2001 .

[6]  G. Sabbi,et al.  Fabrication and test of Nb/sub 3/Sn racetrack coils at high field , 2001 .

[7]  R. Gupta,et al.  Common coil magnet system for VLHC , 1999, Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366).

[8]  S. Russenschuck,et al.  ROXIE - A Computer Code for the Integrated Design of Accelerator Magnets , 1999 .

[9]  S. Ramberger,et al.  A high field magnet design for a future Hadron collider , 1999, IEEE Transactions on Applied Superconductivity.

[10]  S. Ramberger,et al.  Field quality optimization in a common coil magnet design , 2000, IEEE Transactions on Applied Superconductivity.

[11]  W. Sampson,et al.  Persistent current effects in BSCCO common coil dipoles , 2000 .

[12]  D. R. Dietderich,et al.  Fabrication and Test Results of a Prototype, Nb3Sn Superconducting Racetrack Dipole Magnet , 1998 .