Conceptual design study of iron-based superconducting dipole magnets for SPPC

Abstract

A conceptual design study of 12-T two-in-one dipole magnets is ongoing with the iron-based superconducting (IBS) technology, as a candidate option for Super Proton Proton Collider (SPPC), which is designed with a circumference of 100 km and a center-of-mass energy of 70 TeV. Compared with Nb3Sn, the IBS design is competitive because of the potential much higher performance and lower cost of IBS conductors in the future. The design study is carried out with an expected Je level of IBS in 10 years. Besides, we also expect the IBS superconductor to have much better mechanical properties compared to stress-sensitive conductors like Nb3Sn and Bi-2212 wires. The 12-T dipole magnet is designed with common-coil configuration. We have optimized the field uniformity with two different layouts of the coil ends, including the soft-way bending and the hard-way bending. We also have explored the influence of a mid-plane gap on the field uniformity. The main parameters, the coil layouts, and the optimization of the field quality are presented.

Current transport, magnetic and elemental properties of densified Ag-sheathed Ba1−xKxFe2As2 tapes

“…The potential of 122 type (AeFe 2 As 2 , Ae = alkali or alkali earth elements) iron-based superconductors (IBS) is nowadays widely recognized by the applied superconductivity community. The high critical temperature (T C > 30 K), the very high upper critical field that extrapolates to ∼100 T at 0 K, and the low anisotropy ≲ 2, make this class of superconductors particularly interesting for solenoids and accelerator magnets able to generate magnetic fields unattainable with low-temperature superconductors [1][2][3][4][5]. Many advances have been made in the manufacturing routes of wires and tapes that have allowed achieving critical current densities (J C ) of ∼10 5 A cm −2 at 4.2 K, 10 T, which goes beyond the performances of Nb-Ti and MgB 2 wires and tapes [6][7][8].…”

A very high energy hadron collider on the Moon

“…Magnet R & D for IBS technology is developing [78][79][80][81] and IBS could likely prove an appealing alternative to ReBCO-based HTS. A rough price estimate for the SPPC IBS magnets is 200k RMB (or ∼28k CHF as of May 2021) per meter, roughly shared between the cost of the IBS conductor and the mechanical components of the magnet [82].…”

Superconducting magnets and technologies for future colliders

“…Two types of coil ends based on soft-way bending and hard-way bending are being studied and compared with respect to the field quality and structure design and parameters. The magnet design details and parameters are reported in [38].…”