20-T Dipole Magnet With Common-Coil Configuration: Main Characteristics and Challenges

The Institute of High Energy Physics (Beijing, China) is pursuing R&D of high-field accelerator magnet technology for the recently proposed CEPC-SPPC project, which will need thousands of 20-T level accelerator magnets in 20 years. A long-term plan has been made aiming to realize the 20-T magnets in 15 years. The conceptual design study has been ongoing from 2014 based on the current Jc level of superconductors. As both Nb3Sn and high-temperature superconductor superconducting materials are strain sensitive, the common-coil configuration has been chosen as the first option for the design study of the 20-T dipoles, to simplify the coil structure, raise the bending radius, and lower the strain level in superconducting coils. The magnetic analysis, mechanical analysis, and preliminary design study of the straight section and the coil ends have been completed for a 20-T common-coil dipole magnet. The main characteristics and challenges of this design concept will be presented in this paper.

[1]  D. R. Dietderich,et al.  Nb3Sn research and development in the USA – Wires and cables , 2008 .

[2]  E. Todesco,et al.  The Development of Superconducting Magnets for Use in Particle Accelerators: From the Tevatron to the LHC , 2008 .

[3]  T. Hasegawa,et al.  Critical current variation of Rutherford cable of Bi-2212 in high magnetic fields with transverse stress , 2000 .

[5]  Zian Zhu,et al.  Magnetic Design Study of the High-Field Common-Coil Dipole Magnet for High-Energy Accelerators , 2015, IEEE Transactions on Applied Superconductivity.

[6]  Christian Scheuerlein,et al.  Isotropic round-wire multifilament cuprate superconductor for generation of magnetic fields above 30 T. , 2014, Nature materials.

[7]  D. R. Dietderich,et al.  Canted–Cosine–Theta Magnet (CCT)—A Concept for High Field Accelerator Magnets , 2014, IEEE Transactions on Applied Superconductivity.

[8]  S. Caspi,et al.  Design of HD2: a 15 tesla Nb/sub 3/Sn dipole with a 35 mm bore , 2005, IEEE Transactions on Applied Superconductivity.

[9]  M. Sumption,et al.  Refinement of Nb3Sn grain size by the generation of ZrO2 precipitates in Nb3Sn wires , 2014, 1402.3001.

[10]  P. Bish,et al.  A new support structure for high field magnets , 2002 .

[11]  A. Prodell,et al.  The magnet system of the Relativistic Heavy Ion Collider (RHIC) , 1996 .

[12]  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).