Conveners
Wed-Af-Or14 - Novel Wire Processes and Development - in Memoriam of Prof. Kyoji Tachikawa
- Matthew C. Jewell (University of Wisconsin - Eau Claire)
- Charlie Sanabria (Commonwealth Fusion Systems)
It was found that arranging filaments in a multifilament Nb3Sn conductor under a specific angle or twist pitch length, the strain sensitivity of the critical current can be removed. The physical reason is that at such an angle the distortion of the Nb3Sn crystallographic unit cell, which is responsible for the reduction of the critical current under strain, is zero and independent of the...
After over 50 years of application, Nb₃Sn remains by far the most economical superconductor for magnetic fields beyond the reach of Nb-Ti but new challenges such as the Future Circular Collider, FCC, require critical current density (Jc) values well-beyond what is possible with available commercial Nb₃Sn wire. Furthermore, future high field magnets will also require higher Jc margins to allow...
Accelerator magnets made of state-of-the-art Nb3Sn strands unveil relatively long training. This could be due to the low stability of high-Jc Nb3Sn wires to flux jumping provoked by mechanical perturbations in the magnet coils and/or by epoxy cracking. Conductor stability to flux jumps can be increased by reducing the superconductor filaments size while maintaining low resistivity of the...
The development of Nb3Sn wires doped with artificial pinning centres (APC) from binary to ternary compounds is reported. ZrO2-doped tube-type (TT) and powder-in-tube (PIT) were manufactured by Hyper Tech Research Inc. with the aim of reaching the FCC requirements (non-Cu Jc=1500 A mm-2 at 16T and 4.2K). Short pieces of the wires were characterized by means of SQUID magnetometry in order to...
Rutherford cables based on high critical current density Jc Nb3Sn wires are considered for next generation accelerator dipole and quadrupole magnets. The operating magnetic field of these magnets is expected to be significantly larger than that of the Nb3Sn magnets developed for the High Luminosity – Large Hadron Collider (HL-LHC) project, which is about 12 T. In particular the present...
Iron-based superconductors (IBS), especially 122 type, are very promising candidates for high-field applications because of its ultrahigh Hc2 > 70 T at 20 K, low anisotropy ( < 2 for 122) , and ease of fabrication. Recently, thanks to the great supports from Chinese government, significant progresses on the IBS wires have been made, in terms of both Jc enhancement and practical research. In...
Iron-based superconductor (IBS) is expected to be the next generation high temperature superconductor with their potential good properties for the high-field application. This study focus on exploration of the characteristics of IBS coils at high field and development of the IBS coil fabrication technology. A series of ϕ35 mm IBS coils including single pancake (SPC) and double pancakes (DPC)...
