Engineering Papers⌕ Search
Home/Archive/DOE OSTI

DOE OSTI · 3685233

Fabrication and test of a 6-tesla-class high-temperature superconducting dipole magnet at 4.2 K

Abraimov, Dmytro [National High Magnetic Field Laboratory; Florida State University]·Arbelaez, Diego [Lawrence Berkeley National Laboratory] (ORCID:0000000218555317)·Brouwer, Lucas [Lawrence Berkeley National Laboratory] (ORCID:0000000321707278)·Croteau, Jean-François [Lawrence Berkeley National Laboratory] (ORCID:0000000234868401)·DiMarco, Joseph [Fermi National Accelerator Laboratory] (ORCID:0000000228400036)·Ferracin, Paolo [Lawrence Berkeley National Laboratory]·Ghiorso, William B. [Lawrence Berkeley National Laboratory]·Higley, Hugh C. [Lawrence Berkeley National Laboratory]·Juchno, Mariusz [Lawrence Berkeley National Laboratory]·Lin, Andy [Lawrence Berkeley National Laboratory] (ORCID:0000000238030083)·Lipton, Thomas [Lawrence Berkeley National Laboratory]·Luo, Linqing [Lawrence Berkeley National Laboratory] (ORCID:0000000270736588)·Marchevsky, Maxim [Lawrence Berkeley National Laboratory]·Mosat, Marek [Lawrence Berkeley National Laboratory] (ORCID:0000000207713906)·Naus, Michael [Lawrence Berkeley National Laboratory] (ORCID:0000000249034901)·Norris, Ryan [Lawrence Berkeley National Laboratory]·Pong, Ian [Lawrence Berkeley National Laboratory] (ORCID:0000000289964249)·Prestemon, Soren O. [Lawrence Berkeley National Laboratory]·Radcliff, Kyle [Advanced Conductor Technologies LLC] (ORCID:0009000263892176)·Rudeiros Fernández, José Luis [Lawrence Berkeley National Laboratory]·Sabbi, GianLuca [Lawrence Berkeley National Laboratory] (ORCID:0000000169543482)·Saravanan, Anjana [Lawrence Berkeley National Laboratory] (ORCID:0009000691546632)·Shen, Tengming [Lawrence Berkeley National Laboratory] (ORCID:000000031581320X)·Teyber, Reed [Lawrence Berkeley National Laboratory]·Turqueti, Marcos [Lawrence Berkeley National Laboratory] (ORCID:0000000238921353)·Vallone, Giorgio [Lawrence Berkeley National Laboratory] (ORCID:0000000307168116)·van der Laan, Danko [Advanced Conductor Technologies LLC; University of Colorado] (ORCID:0000000158893751)·Villabona, Timothy [Lawrence Berkeley National Laboratory]·Wang, Xiaorong [Lawrence Berkeley National Laboratory] (ORCID:0000000170658615)·Weiss, Jeremy D. [Advanced Conductor Technologies LLC; University of Colorado] (ORCID:0000000300263049)·Wu, Yuxin [Lawrence Berkeley National Laboratory]·Yan, Yufan [Lawrence Berkeley National Laboratory] (ORCID:0000000196475622)
View original source ↗Read source document ↗Export metadata ↓

Abstract

Superconducting magnets enable energy-frontier accelerators by generating strong magnetic fields to steer and focus the particles. Although high-temperature superconductors such as REBa 2 Cu 3 O x (, RE = rare earth) hold a strong potential for generating a higher magnetic field than Nb-Ti and Nb 3 Sn , the associated magnet and conductor technology for accelerator applications is still in its infancy. The U.S. Magnet Development Program is developing magnet technology in collaboration with industry. Here we report an experiment of making a dipole magnet called C3 using commercial high-temperature superconducting wires. The magnet, following a canted cos θ design, generated a dipole field of 5.99 T at 4.2 K in its clear aperture of 65 mm at 6.795 kA when a resistive voltage of 105 μ V appeared across one of the coils in the magnet. The stored energy was 53 kJ at the peak field. The magnet showed no degradation in the current-carrying capability at 4.2 K after the thermal cycle. We report on the detailed design, fabrication, and performance of the C3 magnet that can be of interest to potential users of this emerging technology. We also discuss issues and research needs to inform future magnet development. The experiment represented another step to addressing if the high-temperature superconducting accelerator magnet technology can increase the discovery capability of future particle accelerators.

Keep this discovery

BibTeXRIS

Abraimov, Dmytro [National High Magnetic Field Laboratory; Florida State University], Arbelaez, Diego [Lawrence Berkeley National Laboratory] (ORCID:0000000218555317), Brouwer, Lucas [Lawrence Berkeley National Laboratory] (ORCID:0000000321707278), Croteau, Jean-François [Lawrence Berkeley National Laboratory] (ORCID:0000000234868401), DiMarco, Joseph [Fermi National Accelerator Laboratory] (ORCID:0000000228400036), Ferracin, Paolo [Lawrence Berkeley National Laboratory], Ghiorso, William B. [Lawrence Berkeley National Laboratory], Higley, Hugh C. [Lawrence Berkeley National Laboratory], Juchno, Mariusz [Lawrence Berkeley National Laboratory], Lin, Andy [Lawrence Berkeley National Laboratory] (ORCID:0000000238030083), Lipton, Thomas [Lawrence Berkeley National Laboratory], Luo, Linqing [Lawrence Berkeley National Laboratory] (ORCID:0000000270736588), Marchevsky, Maxim [Lawrence Berkeley National Laboratory], Mosat, Marek [Lawrence Berkeley National Laboratory] (ORCID:0000000207713906), Naus, Michael [Lawrence Berkeley National Laboratory] (ORCID:0000000249034901), Norris, Ryan [Lawrence Berkeley National Laboratory], Pong, Ian [Lawrence Berkeley National Laboratory] (ORCID:0000000289964249), Prestemon, Soren O. [Lawrence Berkeley National Laboratory], Radcliff, Kyle [Advanced Conductor Technologies LLC] (ORCID:0009000263892176), Rudeiros Fernández, José Luis [Lawrence Berkeley National Laboratory], Sabbi, GianLuca [Lawrence Berkeley National Laboratory] (ORCID:0000000169543482), Saravanan, Anjana [Lawrence Berkeley National Laboratory] (ORCID:0009000691546632), Shen, Tengming [Lawrence Berkeley National Laboratory] (ORCID:000000031581320X), Teyber, Reed [Lawrence Berkeley National Laboratory], Turqueti, Marcos [Lawrence Berkeley National Laboratory] (ORCID:0000000238921353), Vallone, Giorgio [Lawrence Berkeley National Laboratory] (ORCID:0000000307168116), van der Laan, Danko [Advanced Conductor Technologies LLC; University of Colorado] (ORCID:0000000158893751), Villabona, Timothy [Lawrence Berkeley National Laboratory], Wang, Xiaorong [Lawrence Berkeley National Laboratory] (ORCID:0000000170658615), Weiss, Jeremy D. [Advanced Conductor Technologies LLC; University of Colorado] (ORCID:0000000300263049), Wu, Yuxin [Lawrence Berkeley National Laboratory], Yan, Yufan [Lawrence Berkeley National Laboratory] (ORCID:0000000196475622). 2026-08-14. Fabrication and test of a 6-tesla-class high-temperature superconducting dipole magnet at 4.2 K. https://doi.org/10.1103/4nhs-bkwh

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

DOE OSTI2026

Decorated Honeycomb Lattice and Successive Magnetic Transitions of the Delafossite Derivative K 4 Ni 5 Te 3 O 16

Here, we report the synthesis and characterization of the delafossite derivative K 4 Ni 5 Te 3 O 16 , which hosts a decorated honeycomb Ni 2+ lattice. Single-crystal X-ray diffraction, electron microscopy, and neutron diffraction establish a noncentrosymmetric Pmm2 crystal structure that combines regular honeycomb units with elongated motifs formed by Ni 2+ trimers along extended edges. Magnetic susceptibility reveals strong antiferromagnetic interactions, while heat capacity measurements identify two successive magnetic transitions at 30 and 12 K. Neutron diffraction shows that these transitions correspond to a progression from partial to full long-range magnetic order on distinct Ni sites, reflecting competition among the various exchange interactions. The resulting magnetic point group, mm2.1′, inherits the lattice polarity and permits high-order magnetoelectric coupling. Consistent with this symmetry, a quadratic magnetic-field-induced polarization is experimentally observed below the magnetic ordering temperature, likely arising from exchange-driven magnetostriction coupled to the polar lattice. These results establish K 4 Ni 5 Te 3 O 16 as an interesting platform for engineering B-site ordering in delafossite derivatives to realize complex quantum magnetism and functional responses.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
NASA NTRS1993

Insertion Loss and Noise-Temperature Contribution of High-Temperature Superconducting Bandpass Filters Centered at 2.3 and 8.45 GHz

Two superconducting Tl-Ca-Cu-Ba-O bandpass filters were fabricated for JPL by Superconductor Technologies Incorporated, Santa Barbara, California. The filters were designed to operate at 2.3 GHz (S-band) with a 0.5-dB bandwidth of 60 MHz and at 8.45 GHz (X-band) with a 0.5-dB bandwidth of 150 MHz. The structure selected for both filters incorporates half-wavelength thin-film resonators in a stripline configuration. The S-band filter uses an edge-coupled interdigital design and the X-band filter uses an end-coupled design. The insertion loss and the noise-temperature contribution were measured at 12 K for both filters.

J L Prater↗
DOE OSTI2025

Challenges in Continuous In-Field Critical Current Testing of High-Temperature Superconducting Tapes: Thermal and Mechanical Perspectives

High-temperature superconductors (HTS) are essential for ultra-high-field applications requiring exceptional current-carrying capacity under extreme conditions. However, systematic characterization of critical current in long-length conductors remains challenging due to complex thermal, electromag netic, and mechanical interactions during continuous testing. This study reports the development of a continuous in-field magnetization testing system for position-dependent critical current measurement in HTS tapes at 20 K under 7.5 T fields applied normal to the tape plane, enabling identification of performance-limiting regions that could compromise magnet stability. Here, the system addresses two fundamental challenges inherent to cryogenic reel to-reel testing. First, thermal management requires continuous cooling of a moving conductor to 20 K, achieved through liquid nitrogen precooling combined with a 100 W@20 K Gifford McMahon cryocooler. Second, screening currents in high fields generate Lorentz forces that induce twisting, bowing, and potential delamination. To mitigate these risks, we propose mechanical reinforcement and active current density suppression strategies. Numerical simulations using the stream function formulation reveal four primary failure modes: frictional heating at guide interfaces, unstable equilibria causing deformation, transverse current-induced stresses at guide transitions, and unsupported forces in vertical spans. Our mitigation strategies include PTFE coated guides to minimize friction, spring-loaded stabilization mechanisms to maintain tape alignment, controlled pre-heating using the liquid nitrogen thermal jacket to suppress critical current at stress points, and optimized guide positioning to minimize force accumulation. The experimental system is nearing completion, with testing planned to commence within two months. Preliminary validation at 65 K under 0.5 T demonstrates strong correlation between simulation-predicted mechanical instabilities and observed critical current variations during conductor tran sitions through the measurement region. These findings establish a robust foundation for quality assurance protocols essential to next-generation superconducting magnet applications.

Chen, Siwei [Princeton Plasma Physics Laboratory (↗