John Voccio
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View article: Board 98: Engineering Education Curriculum Needs for Achieving Sustainable Energy and Decarbonize Economy
Board 98: Engineering Education Curriculum Needs for Achieving Sustainable Energy and Decarbonize Economy Open
The pressing demands of climate change require innovative and multidisciplinary approaches to training and equipping a new generation of engineers and physicists to be ready to solve this global challenge, and transitioning to this new sus…
View article: Low-frequency electric fields at smartphone surface
Low-frequency electric fields at smartphone surface Open
Mobile phones, tablets, and other devices with capacitive touchscreens are ubiquitous in modern society. Consequently, the battery health of such devices along with the potential public health impacts of their typical use is of high import…
View article: High-Speed Spin Testing of Bi-2212 Superconducting Wires for High-Field NMR Magnet Qualification: Final Progress Report
High-Speed Spin Testing of Bi-2212 Superconducting Wires for High-Field NMR Magnet Qualification: Final Progress Report Open
This paper summarizes an NIH-funded research project designed to study the strength of high temperature superconductors under high circumferential hoop stress, in order to qualify these materials for high-field (> 1 GHz-class) NMR magnets.…
View article: Rotor assembly including superconducting magnetic coil
Rotor assembly including superconducting magnetic coil Open
Superconducting coils and methods of manufacture include a superconductor tape wound concentrically about and disposed along an axis of the coil to define an opening having a dimension which gradually decreases, in the direction along the …
View article: Electrostatic Charge on Smartphone Surfaces
Electrostatic Charge on Smartphone Surfaces Open
Mobile phones, tablets, and capacitive touchscreens, in general, are ubiquitous in modern society. In this study, the electrostatic charge present near the capacitive touchscreen surfaces was investigated. Results from a Faraday pail exper…
View article: Progress in High-Speed Spin Testing of Superconducting Wire and Tapes for High-Field NMR Magnet Qualification
Progress in High-Speed Spin Testing of Superconducting Wire and Tapes for High-Field NMR Magnet Qualification Open
This paper summarizes the status of a 3-year, NIH-funded research project to study the strength of high temperature superconductors under high circumferential hoop stress, in order to qualify these materials for high-field (> 1 GHz-class N…
View article: Electromagnetic analysis of fully superconducting motor for electric aircraft
Electromagnetic analysis of fully superconducting motor for electric aircraft Open
In order to reduce carbon emissions, there is considerable interest in all-electric aircraft for transportation. Fully superconductor motors will be required to meet the high specific weight requirements, which are >10 kW/kg for the NASA N…
View article: High Speed Spin Testing of Reinforced 2212 Coils for High Field NMR Magnets
High Speed Spin Testing of Reinforced 2212 Coils for High Field NMR Magnets Open
Bi-2212 superconductors have very good performance in field, and recent developments by Solid Materials Solutions (SMS) of Chelmsford, MA to mechanically reinforce this material will help realize the potential of this material for these hi…
View article: A Tabletop Persistent-Mode, Liquid Helium-Free 1.5-T MgB<sub>2</sub> “Finger” MRI Magnet: Construction and Operation of a Prototype Magnet
A Tabletop Persistent-Mode, Liquid Helium-Free 1.5-T MgB<sub>2</sub> “Finger” MRI Magnet: Construction and Operation of a Prototype Magnet Open
This paper presents results of construction and operation of a persistent-mode, liquid-helium-free, small-scale prototype magnet for the development of a tabletop 1.5-T "finger" MRI system for osteoporosis screening. The prototype magnet, …
View article: The proposed approach for determining combined stresses of a component
The proposed approach for determining combined stresses of a component Open
For a mechanical engineering program, one of the main learning outcomes is that students can design mechanical system components. Achieving this outcome requires students be trained to calculate the combined stresses of a component with mu…
View article: A REBCO Persistent-Current Switch (PCS): Test Results and Switch Heater Performance
A REBCO Persistent-Current Switch (PCS): Test Results and Switch Heater Performance Open
In this paper, we report preliminary results of our on-going effort to develop a superconducting persistent-current switch (PCS) for REBCO pancake coils that will be operated in liquid helium. In the first part of this paper, we briefly de…
View article: A persistent-mode 0.5 T solid-nitrogen-cooled MgB<sub>2</sub>magnet for MRI
A persistent-mode 0.5 T solid-nitrogen-cooled MgB<sub>2</sub>magnet for MRI Open
This paper presents construction details and test results of a persistent-mode 0.5-T MgB2 magnet developed at the Francis Bitter Magnet Lab, MIT. The magnet, of 276-mm inner diameter and 290-mm outer diameter, consisted of a stack of 8 sol…
View article: Magnetic levitation using a stack of high temperature superconducting tape annuli
Magnetic levitation using a stack of high temperature superconducting tape annuli Open
Stacks of large width superconducting tape can carry persistent currents over similar length scales to bulk superconductors, therefore giving them potential for trapped field magnets and magnetic levitation. 46 mm wide high temperature sup…
View article: Persistent-current switch for pancake coils of rare earth-barium-copper-oxide high-temperature superconductor: Design and test results of a double-pancake coil operated in liquid nitrogen (77–65 K) and in solid nitrogen (60–57 K)
Persistent-current switch for pancake coils of rare earth-barium-copper-oxide high-temperature superconductor: Design and test results of a double-pancake coil operated in liquid nitrogen (77–65 K) and in solid nitrogen (60–57 K) Open
We present design and test results of a superconducting persistent current switch (PCS) for pancake coils of rare-earth-barium-copper-oxide, REBCO, high-temperature superconductor (HTS). Here, a REBCO double-pancake (DP) coil, 152-mm ID, 1…
View article: High-Resolution Magnetic Field Mapping System With an NMR Probe
High-Resolution Magnetic Field Mapping System With an NMR Probe Open
This paper presents a high-resolution magnetic field mapping system in development that is capable of collecting spatial magnetic field data for NMR magnets. An NMR probe was designed and built with a resonant frequency of 5.73 MHz. The me…
View article: A Theoretical Design Approach for Passive Shimming of a Magic-Angle-Spinning NMR Magnet
A Theoretical Design Approach for Passive Shimming of a Magic-Angle-Spinning NMR Magnet Open
This paper presents a passive shimming design approach for a magic-angle-spinning (MAS) NMR magnet. In order to achieve a 1.5-T magic-angle field in NMR samples, we created two independent orthogonal magnetic vector fields by two separate …
View article: Solid-cryogen-stabilized, cable-in-conduit (CIC) superconducting cables
Solid-cryogen-stabilized, cable-in-conduit (CIC) superconducting cables Open
This paper considers the use of a solid cryogen as a means to stabilize, both mechanically and thermally, magnesium diboride (MgB2) superconducting strands within a dual-channel cable-in-conduit (CIC) cable for use in AC applications, such…
View article: An analytical approach towards passive ferromagnetic shimming design for a high-resolution NMR magnet
An analytical approach towards passive ferromagnetic shimming design for a high-resolution NMR magnet Open
This paper presents a warm bore ferromagnetic shimming design for a high resolution NMR magnet based on spherical harmonic coefficient reduction techniques. The passive ferromagnetic shimming along with the active shimming is a critically …