Abstract:The iron-based superconductor (IBS) single pancake coil (SPC) with 30 mm inner diameter was firstly fabricated and tested under 24 T background field. This SPC was successfully made using the 7-filamentary Ba1-xKxFe2As2 (Ba122) tape by wind-andreact method. This IBS coil show the highest Ic value at magnetic field reported so far.For example, the transport critical current of this Ba122 SPC achieved 35 A at 4.2 K and 10 T, which is about half of that of short sample. This indicates that the noninsulation windi… Show more
“…In 2018, an IBS single pancake coil was firstly fabricated with Ba-122 superconducting tapes and tested under a 24 T background field ( Wang et al, 2019 ), then another single pancake coil and a double pancake coil were developed and tested at a 30 T background field ( Qian et al, 2021 ), showing very weak dependence of critical currents on such high magnetic field. In 2020, by using 100-meter 7-filament Ba-122 tapes provided by IEECAS, IBS racetrack coils were firstly fabricated at the Institute of High Energy Physics, Chinese Academy of Sciences (IHEPCAS).…”
Section: Materials Challenges and Current State Of Practical Applicationsmentioning
confidence: 99%
“…At present, a conceptual design study of 12 T dipole magnets is ongoing with the IBS technology to fulfill the requirements and need of a large-scale superconducting accelerator proposed by IHEPCAS ( The CEPC Study Group, 2018 ). Figure 8 Iron-based superconducting coils Pancake coils ( Wang et al, 2019 ; Qian et al, 2021 ) and racetrack coils ( Zhang et al, 2021 ) were made with iron-based superconductors and their in-field critical currents, which show weak field dependence up to 30 T and 12 T, respectively. …”
Section: Materials Challenges and Current State Of Practical Applicationsmentioning
confidence: 99%
“… Pancake coils ( Wang et al, 2019 ; Qian et al, 2021 ) and racetrack coils ( Zhang et al, 2021 ) were made with iron-based superconductors and their in-field critical currents, which show weak field dependence up to 30 T and 12 T, respectively. …”
Section: Materials Challenges and Current State Of Practical Applicationsmentioning
Summary
Superconducting materials hold great potential to bring radical changes for electric power and high-field magnet technology, enabling high-efficiency electric power generation, high-capacity loss-less electric power transmission, small lightweight electrical equipment, high-speed maglev transportation, ultra-strong magnetic field generation for high-resolution magnetic resonance imaging (MRI) systems, nuclear magnetic resonance (NMR) systems, future advanced high energy particle accelerators, nuclear fusion reactors, and so on. The performance, economy, and operating parameters (temperatures and magnetic fields) of these applications strongly depend on the electromagnetic and mechanical properties, as well as the manufacturing and material cost of superconductors. This perspective examines the basic properties relevant to practical applications and key issues of wire fabrication for practical superconducting materials, and describes their challenges and current state in practical applications. Finally, future perspectives for their opportunities and development in the applications of superconducting power and magnetic technologies are considered.
“…In 2018, an IBS single pancake coil was firstly fabricated with Ba-122 superconducting tapes and tested under a 24 T background field ( Wang et al, 2019 ), then another single pancake coil and a double pancake coil were developed and tested at a 30 T background field ( Qian et al, 2021 ), showing very weak dependence of critical currents on such high magnetic field. In 2020, by using 100-meter 7-filament Ba-122 tapes provided by IEECAS, IBS racetrack coils were firstly fabricated at the Institute of High Energy Physics, Chinese Academy of Sciences (IHEPCAS).…”
Section: Materials Challenges and Current State Of Practical Applicationsmentioning
confidence: 99%
“…At present, a conceptual design study of 12 T dipole magnets is ongoing with the IBS technology to fulfill the requirements and need of a large-scale superconducting accelerator proposed by IHEPCAS ( The CEPC Study Group, 2018 ). Figure 8 Iron-based superconducting coils Pancake coils ( Wang et al, 2019 ; Qian et al, 2021 ) and racetrack coils ( Zhang et al, 2021 ) were made with iron-based superconductors and their in-field critical currents, which show weak field dependence up to 30 T and 12 T, respectively. …”
Section: Materials Challenges and Current State Of Practical Applicationsmentioning
confidence: 99%
“… Pancake coils ( Wang et al, 2019 ; Qian et al, 2021 ) and racetrack coils ( Zhang et al, 2021 ) were made with iron-based superconductors and their in-field critical currents, which show weak field dependence up to 30 T and 12 T, respectively. …”
Section: Materials Challenges and Current State Of Practical Applicationsmentioning
Summary
Superconducting materials hold great potential to bring radical changes for electric power and high-field magnet technology, enabling high-efficiency electric power generation, high-capacity loss-less electric power transmission, small lightweight electrical equipment, high-speed maglev transportation, ultra-strong magnetic field generation for high-resolution magnetic resonance imaging (MRI) systems, nuclear magnetic resonance (NMR) systems, future advanced high energy particle accelerators, nuclear fusion reactors, and so on. The performance, economy, and operating parameters (temperatures and magnetic fields) of these applications strongly depend on the electromagnetic and mechanical properties, as well as the manufacturing and material cost of superconductors. This perspective examines the basic properties relevant to practical applications and key issues of wire fabrication for practical superconducting materials, and describes their challenges and current state in practical applications. Finally, future perspectives for their opportunities and development in the applications of superconducting power and magnetic technologies are considered.
“…High-T c superconducting (HTS) coils wound without insulation (NI coils) were first proposed by Hahn [1], and have many useful properties [2][3][4][5] and applications [5][6][7][8][9][10][11][12][13]. Omitting insulation between the turns of the coil provides both current and heat with alternative pathways through the coil's structure.…”
The no-insulation (NI) winding method is an effective technique for winding coils from high-T c superconductors (HTS). NI coils are electrically and thermally robust due to their ability to radially bypass current away from the fragile superconducting path when necessary. This avoids stored magnetic energy being entirely discharged on local defects in the HTS tape. However, the increased degrees of freedom for the current distribution makes finite-element modelling of these coils a complicated and multi-level problem. Here we present and validate a 2D axially symmetric model of an NI (or partially insulated) coil that captures all the inherent electromagnetic properties of these coils, including axial vs radial current flow and critical current suppression, and also reproduces the well-known charging and discharging characteristics. The model is validated against previously reported discharge measurements, and is shown to produce results consistent with the expected equivalent-circuit behaviour. Only by solving the NI coil problem with both axial and radial fidelity can the interplay of critical current anisotropy and turn-to-turn current be properly accounted for. The reported FE model will now enable coil designers to simulate key complex behaviours observed in NI coils, such as shielding currents, magnetic field inhomogeneity and remnant field effects.
“…Magnet R&D for IBS technology is developing [68][69][70][71] 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 [72].…”
The long-term prospect of building a hadron collider around the circumference of a great circle of the Moon is sketched. A Circular Collider on the Moon (CCM) of ∼11000 km in circumference could reach a proton-proton center-of-mass collision energy of 14 PeV -a thousand times higher than the Large Hadron Collider at CERN -optimistically assuming a dipole magnetic field of 20 T. Siting and construction considerations are presented. Machine parameters, powering, and vacuum needs are explored. An injection scheme is delineated.Other unknowns are set down. Through partnerships between public and private organizations interested in establishing a permanent Moon presence, a CCM could be the (next-to-) next-to-next-generation discovery machine and a natural successor to next-generation machines, such as the proposed Future Circular Collider at CERN or a Super Proton-Proton Collider in China, and other future machines, such as a Collider in the Sea, in the Gulf of Mexico. A CCM would serve as an important stepping stone towards a Planck-scale collider sited in our Solar System.
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