A5016438075- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Superconductivity in MgB2 and Alloys
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Thermal Expansion and Ionic Conductivity
- Thermal and Kinetic Analysis
- Electromagnetic Launch and Propulsion Technology
- Advanced materials and composites
- Fusion materials and technologies
- Advanced ceramic materials synthesis
- Iron-based superconductors research
The Ohio State University
2017-2024
University of Arizona
2022
In this letter we demonstrate the development of ternary Nb3Sn multifilamentary conductors with artificial pinning centers (APC) which achieve high critical fields. These recently-developed were tested in a 31 T magnet, and results showed that their upper field (Bc2) values at 4.2 K are 27–28 T, irreversible (Birr) above 26 similar to or higher than those best rod-restack-process (RRP) conductors. The non-Cu Jc has been brought nearly 1200 A mm−2 16 K, comparable RRP, spite fact fine-grain...
Internally oxidized Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn wires with artificial pinning centers (APC) have been developed by manufacturing a multifilament PIT-style wire, each filament consisting of Nb-Ta-Zr alloy tube filled mixture Sn, Cu, and oxide powders. During heat treatment, the decomposes, oxygen goes into solid solution in alloy. Upon diffusion alloy, ZrO xmlns:xlink="http://www.w3.org/1999/xlink">2</sub>...
Abstract This work focuses on the superconducting and magnetic properties of Chevrel phase (CP) compounds (Cu 2 Mo 6 S 8 Ni ) processed via a novel self-propagating high-temperature synthesis (SHS) method involving ternary cation intercalation in MoS polymorphs. Green pellets precursor materials sealed under vacuum exposed to 1050 °C or 1200 rapidly transformed from powder mixture into submicron CPs within minutes. X-ray diffraction analysis confirmed presence Cu CP (67%), (93%). group has...
A react-and-wind MgB2 coil segment for a conduction-cooled magnetic resonance imaging (MRI) machine has been fabricated and tested. The was developed as part of collaborative effort on conduction-cooled, MgB2-based, whole-body MRI image guided radiation therapy device. This study focuses the fabrication, winding, instrumentation, cooling, initial critical current (Ic) testing this near-full-size coil. 0.9 m in diameter; winding pack, 44.0 mm wide × 50.6 high, used 1.7 km an 18 filament...
Abstract Nb 3 Sn superconductors are promising for building accelerator magnets future energy-frontier circular colliders. A critical factor this application is the low-field persistent-current magnetization because it leads to several issues: e.g. instability (including flux jumps), hysteresis loss, and field errors in magnet bores. Suppression of requires reduction current density ( J c ) or effective subelement size d eff ). However, state-of-the-art conductors—the restacked-rod-process...
In this letter we demonstrate achievement of record non-Cu critical current density (Jc,non-Cu) in ternary, multifilamentary Nb3Sn conductors by the introduction artificial pinning centers (APC). past two years, have made great progress development APC wires. Recent resistivity vs magnetic field measurements confirmed high upper (Bc2) ternary wires, which at 4.2 K was ~28 T, about 1-2 T higher than present state-of-the-art conductors. addition to Bc2, it found that wires noticeably Sn...
Bi-2212 superconducting cables are being considered for use in the high field magnets needed next generation of particle accelerators. Magnetization these and decay that magnetization lead to error field-error drift, respectively, which need be compensated. To study this, a segment winding pack was extracted from racetrack coil made Rutherford cable. Using Hall probe measurement technique, we measured response cable's its changes applied magnetic field. The effect adjustments cycling...
Multifilamentary
Abstract Thermodynamic modeling of Zr–B–C–O quaternary system is conducted within the CALPHAD framework by employing data obtained from first‐principle calculations and literature. The lower order binary B–O assessed in this work estimating thermodynamic properties stable solid phases B 2 O 3 6 gas liquid phases. First‐principle calculations, conjunction with special quasirandom structure were used to predict enthalpies mixing for ternary solid‐solution phase FCC‐Zr(C, O). calculated results...
Abstract Compared to Nb 3 Sn- and NbTi-wound superconducting undulators (SCUs), MgB 2 -wound SCUs are of interest for future electron synchrotron beam light sources owing their higher temperature operating margin associated stability. In this study, a three-period undulator consisting twelve racetrack coils wound with 2nd generation (2 G) multifilamentary advanced-internal-magnesium-infiltration strands were fabricated tested in liquid gaseous helium (He) over range 4.2 K–20 K. The coil...
This work presents recent results on a low loss Bi:2212 superconductor strand which has great promise for electric aircraft applications. AC measurements are presented show hysteretic as well eddy-coupling current losses. The strands ranged from 0.30 mm down to 0.16 OD, and contained 54 filaments. M-H was measured -1 T 1 T, with ramp rates up 70 mT/s, at 4 K, 20 40 K. loops were integrated give Q vs dB/dt, coupling components of the extracted. With use standard expressions it possible...
High temperature superconductors, including Bi:2212, are being considered for high magnetic field magnets to be used in particle accelerators. A knowledge of HTS magnetization properties needed calculating errors such accelerator magnets. Here we present measurements a 17 strand Bi:2212 Rutherford cable. The was Bruker OST PMM170123 non-twisted wire wound into cable with dimensions 1.46 mm x 7.8 and pitch 50.8 mm. M-H loop were made Hall probe at 4.2 K. Two calibration methods compared, (i)...
Use of superconducting coils for wind turbines and electric aircraft is interest because the potential high power density weight reduction. Here we test a racetrack coil developed as proof-of-concept cryogen-free motors generators. The was wound with 1209 m 0.7-mm-diameter insulated tube-type Nb3Sn wire. epoxy-impregnated, instrumented, covered numerous layers aluminized mylar insulation, inserted vertically into dewar. system cooled to 4.2 K, few inches liquid helium allowed collect at...
A possible approach to reducing Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn magnet training is increase the energy margin of conductors by enhancing their specific heat ( <italic xmlns:xlink="http://www.w3.org/1999/xlink">C<sub>p</sub></i> ). We have been developing with increased incorporating substances high at 2-10 K based on a conductor design that compatible standard strand production. In past couple years our efforts...
In the last few years, a new type of Nb$_3$Sn superconducting composite, containing high density artificial pinning centers (APC) generated via an internal oxidation approach, has demonstrated significantly superior performance relative to present, state-of-the-art commercial conductors. This was achieved Nb-4at.%Ta-1at.%Zr alloy. On other hand, our recent studies have shown that Nb-Ta-Hf alloys can also lead dramatic improvements in performance. this work we follow up latter fabricating...
This paper presents the results of a magnetic design study for 7 T, whole body, actively shielded MRI magnet using Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn conductor. was used as conductor to enable development short (1.4 m) segmented coil designs, opposed nearly 2 m long compensated solenoid designs needed NbTi machines. In addition, use will allow conduction cooled design, if quench is properly managed. We show two both...