M.D. Sumption
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View article: Flux Jumps up to 17 T in ReBCO Tape Stack Cables and their Suppression with Increased Intertape Spacing
Flux Jumps up to 17 T in ReBCO Tape Stack Cables and their Suppression with Increased Intertape Spacing Open
The magnetization of ReBCO tape stacks and tape stack cables in high magnetic fields (up to 30 T) are not commonly reported. Here we report magnetization measurements of tape stack cables in magnetic fields up to 30 T at 4.2 K. We observed…
View article: Simulation study of current sharing in a liquid Helium-cooled three-tape REBCO cable with defects: influence of effective electrical and thermal conductivities and thermal boundary conditions
Simulation study of current sharing in a liquid Helium-cooled three-tape REBCO cable with defects: influence of effective electrical and thermal conductivities and thermal boundary conditions Open
View article: Phase Evolution and Area Fractions of Coarse-Grain and Fine-Grain A15 in APC Nb<sub>3</sub>Sn Superconductors
Phase Evolution and Area Fractions of Coarse-Grain and Fine-Grain A15 in APC Nb<sub>3</sub>Sn Superconductors Open
Previous studies have shown that APC Nb3Sn strands based on the internal oxidation of Nb-Ta-Zr or Nb-Ta-Hf alloys had higher non-Cu critical current density (Jcs) than the state-of-the-art strands at high fields (e.g.…
View article: Semi-analytical modeling AC loss of a flat stack of Y-Ba-Cu-O tapes
Semi-analytical modeling AC loss of a flat stack of Y-Ba-Cu-O tapes Open
We propose semi-analytical models to compute alternating current (AC) power loss in a stack of N high-temperature superconductor YBa2Cu3O7−x (or Y–Ba–Cu–O) tapes subjected to a time-varying magnetic field perpendicular to the tapes with ze…
View article: Intercalation based synthesis of Chevrel phase superconductors
Intercalation based synthesis of Chevrel phase superconductors Open
This work focuses on the superconducting and magnetic properties of Chevrel phase (CP) compounds (Cu 2 Mo 6 S 8 and Ni 2 Mo 6 S 8 ) processed via a novel self-propagating high-temperature synthesis (SHS) method involving ternary cation int…
View article: Impact of cryogenic temperatures on high-power semiconductor performance
Impact of cryogenic temperatures on high-power semiconductor performance Open
Power electronics is necessary for the independent control of the stator windings of electric aircraft motors. The benefit of using liquid fuel to cool conductors to utilize their high current density has enabled power electronics to be co…
View article: Experimental study of two-phase cryogenic cooling of aluminum stator conductors using a single slot test configuration
Experimental study of two-phase cryogenic cooling of aluminum stator conductors using a single slot test configuration Open
An important goal to enable widespread adoption of electric aircraft propulsion is to develop higher power density motors and generators which are at the same time highly efficient. One way to do this is to use conductors that can carry hi…
View article: Tuned Windings: the window of opportunity for the implementation of solid conductors in high frequency cryogenic electric machines
Tuned Windings: the window of opportunity for the implementation of solid conductors in high frequency cryogenic electric machines Open
Optimization techniques can significantly improve the performance of electrical machines. The analysis and the optimization algorithms focus on computational efficiency. In this paper, the optimization of a high frequency electrical machin…
View article: Magnetic Laminates for Motor Slot Wedges and Other Applications
Magnetic Laminates for Motor Slot Wedges and Other Applications Open
We have examined the properties of G-10-Fe, a commercially manufactured fiber-reinforced epoxy with a 70 wt% inclusion of Fe powder, and the advantages of this material in motor slot wedges are presented. The microstructure of G-10-Fe was …
View article: Mechanical and Thermal Analysis of Duroplastic Matrix Composites over a Range of Temperatures
Mechanical and Thermal Analysis of Duroplastic Matrix Composites over a Range of Temperatures Open
It is commonly acknowledged that polymer composites in service are often subjected to not only intricate mechanical loads but also harsh environmental conditions. The mechanical and thermal properties of five particular composites are expl…
View article: A Field Quality Modeling in Canted Cosine Theta Dipole Magnets Wound Using REBCO Cables
A Field Quality Modeling in Canted Cosine Theta Dipole Magnets Wound Using REBCO Cables Open
In accelerator magnets the magnetic field quality is an important parameter. Using REBCO tapes or cables in magnet windings affects the magnetic field quality because of a quite high magnetization generated by these conductors. In this pap…
View article: Superconducting Magnetic Energy Storage for Commercial and Aerospace Applications: Fem Modeling of Rebco-Wound Coils
Superconducting Magnetic Energy Storage for Commercial and Aerospace Applications: Fem Modeling of Rebco-Wound Coils Open
View article: Ac Loss and Shielding in Stacks of Coated Conductors: Analytic Modelling and Comparison to Experiment
Ac Loss and Shielding in Stacks of Coated Conductors: Analytic Modelling and Comparison to Experiment Open
View article: Current Sharing in Rebco Cable with Defects: Influence of Effective Electrical and Thermal Conductivities and Thermal Boundary Conditions
Current Sharing in Rebco Cable with Defects: Influence of Effective Electrical and Thermal Conductivities and Thermal Boundary Conditions Open
View article: Ic measurement of twisted multifilamentary MgB2 wires with non-magnetic sheath over a wide range of temperatures and fields
Ic measurement of twisted multifilamentary MgB2 wires with non-magnetic sheath over a wide range of temperatures and fields Open
All-superconducting rotating machines have the potential for meeting the high power density and high efficiency required for electrical aircraft applications. However, very high AC loss encountered in superconducting armature windings coul…
View article: Development and testing of a three-period, subsize 2G AIMI MgB<sub>2</sub> planar undulator
Development and testing of a three-period, subsize 2G AIMI MgB<sub>2</sub> planar undulator Open
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 to their higher temperature operating margin and associated stability. In thi…
View article: Phase formation and transport properties of vapor-solid reacted AIMI MgB2 superconductors
Phase formation and transport properties of vapor-solid reacted AIMI MgB2 superconductors Open
View article: Significant reduction in the low-field magnetization of Nb<sub>3</sub>Sn superconducting strands using the internal oxidation APC approach
Significant reduction in the low-field magnetization of Nb<sub>3</sub>Sn superconducting strands using the internal oxidation APC approach Open
Nb 3 Sn superconductors are promising for building accelerator magnets for future energy-frontier circular colliders. A critical factor for this application is the low-field persistent-current magnetization because it leads to several crit…
View article: Canted Cosine Theta Dipole Magnet Wound Using REBCO CORC Cables–The Effect of Magnetization on Magnetic Field Quality
Canted Cosine Theta Dipole Magnet Wound Using REBCO CORC Cables–The Effect of Magnetization on Magnetic Field Quality Open
This paper presents the results of FEM analysis of the effect of REBCO CORC cable magnetization on the field quality of a canted cosine theta (CCT) dipole magnet. The magnetic properties of the CORC cable were the results of our measuremen…
View article: Recent Progress in Developing Nb<sub>3</sub>Sn Conductors With Increased Specific Heat
Recent Progress in Developing Nb<sub>3</sub>Sn Conductors With Increased Specific Heat Open
A possible approach to reducing Nb3Sn magnet training is to increase the energy margin of Nb3Sn conductors by enhancing their specific heat (Cp). For this study, we have been developing Nb3Sn con…
View article: Critical Current Densities and n-Values of MgB<sub>2</sub> Conductors for SMES, MRI, and Low AC Loss Applications
Critical Current Densities and n-Values of MgB<sub>2</sub> Conductors for SMES, MRI, and Low AC Loss Applications Open
Multifilamentary strands (filament numbers 36 to 114) prepared by the in-situ power-in-tube (PIT) route with carbon doping contents of 0, 2, and 3.2% were wound on barrels for transport and -value measurement at 4.2 K in fields of up to …
View article: Superconducting wires and methods of making thereof
Superconducting wires and methods of making thereof Open
Disclosed herein are superconducting wires. The superconducting wires can comprise a metallic matrix and at least one continuous subelement embedded in the matrix. Each subelement can comprise a non-superconducting core, a superconducting …
View article: Mechanism of enhanced critical fields and critical current densities of MgB2 wires with C/Dy2O3 co-additions
Mechanism of enhanced critical fields and critical current densities of MgB2 wires with C/Dy2O3 co-additions Open
A series of monofilamentary powder-in-tube MgB2 wires were fabricated with 2 mol. % C doping and co-additions of 0–3 wt. % Dy2O3. Irreversibility fields (μ0Hirr), upper critical fields (μ0Hc2), and transport critical currents were measured…
View article: APC Nb<sub>3</sub>Sn superconductors based on internal oxidation of Nb–Ta–Hf alloys
APC Nb<sub>3</sub>Sn superconductors based on internal oxidation of Nb–Ta–Hf alloys Open
In the last few years, a new type of Nb 3 Sn superconducting composite, containing a high density of artificial pinning centers (APC) generated via an internal oxidation approach, has demonstrated a significantly superior performance relat…
View article: Finite element analysis of the temperature distribution within a Conduction-Cooled, MgB2-based MRI superconducting coil segment
Finite element analysis of the temperature distribution within a Conduction-Cooled, MgB2-based MRI superconducting coil segment Open
View article: Methods of Estimating AC Losses in Superconducting MgB$_{2}$ Armature Windings With Spatial and Time Harmonics
Methods of Estimating AC Losses in Superconducting MgB$_{2}$ Armature Windings With Spatial and Time Harmonics Open
Recent developments in low ac loss MgB 2 conductors are of significant importance given renewed interest in fully superconducting (SC) machines.Evaluating ac losses in fully SC machines is a critical step in developing feasible designs.In …
View article: Corrigendum: Evolution of the superconducting properties from binary to ternary APC-Nb<sub>3</sub>Sn wires (2021 <i>Supercond. Sci. Technol.</i> 34 035028)
Corrigendum: Evolution of the superconducting properties from binary to ternary APC-Nb<sub>3</sub>Sn wires (2021 <i>Supercond. Sci. Technol.</i> 34 035028) Open
View article: Current sharing and stability in an extremely low AC-loss MgB<sub>2</sub> conductor
Current sharing and stability in an extremely low AC-loss MgB<sub>2</sub> conductor Open
In the push to develop high power electric aircraft, superconducting technology promises to significantly reduce mass and volume of motors and generators. However, challenges related to AC-loss and thermal management are a significant fact…
View article: Flux Creep in a Bi-2212 Rutherford Cable for Particle Accelerator Applications
Flux Creep in a Bi-2212 Rutherford Cable for Particle Accelerator Applications Open
Bi-2212 superconducting cables are being considered for use in the high field magnets needed for the next generation of particle accelerators. Magnetization in these cables and the decay of that magnetization lead to field error and field-…
View article: Accelerators, Gantries, Magnets and Imaging Systems for Particle Beam Therapy: Recent Status and Prospects for Improvement
Accelerators, Gantries, Magnets and Imaging Systems for Particle Beam Therapy: Recent Status and Prospects for Improvement Open
The paper begins by emphasizing the clinical and commercial importance of proton or other charged particle such as carbon ion therapy, refers to the manufacturers of such systems of which more than 120 are installed or under construction w…