A5043474408- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- HVDC Systems and Fault Protection
- Magnetic and transport properties of perovskites and related materials
- Frequency Control in Power Systems
- Nuclear and radioactivity studies
- Magnetic confinement fusion research
- Magnetic Properties and Applications
- Nuclear Materials and Properties
- Particle accelerators and beam dynamics
- Graphite, nuclear technology, radiation studies
- Superconductivity in MgB2 and Alloys
- Spacecraft and Cryogenic Technologies
- Advanced MRI Techniques and Applications
- Photonic and Optical Devices
- Power Systems and Renewable Energy
- Quantum Information and Cryptography
- Atomic and Subatomic Physics Research
- Quantum and electron transport phenomena
- Magnetic Field Sensors Techniques
- Advanced Nanomaterials in Catalysis
- Molten salt chemistry and electrochemical processes
- Geophysical Methods and Applications
- Magnetic Properties of Alloys
- Electrical Fault Detection and Protection
Seoul National University
2021-2025
Korea Atomic Energy Research Institute
2014-2022
Hanwha Techwin (South Korea)
2022
Ewha Womans University Medical Center
2021
Seoul Institute
2021
Government of the Republic of Korea
2021
Ewha Womans University
2021
This paper reports experimental and numerical analysis results of a no-insulation (NI) high-temperature superconductor (HTS) coil in terms temperature-dependent electric contact resistivity. A test was designed, constructed, operated. The is divided into four sections according to the radial locations inserted voltage taps measure local voltages. preliminary experiment performed evaluate electromagnetic properties liquid nitrogen. Then, resistance evaluated from <inline-formula...
Abstract The screening current and its relaxation cause the variation of self- mutual inductances REBCO coils—REBCO is one high-temperature superconductors. However, most studies coil voltage analysis on a magnet, stack coils, have reported simulation results assuming invariant so far. Although conventional assumption still acceptable for fundamental analyses, it can misleading conclusions due to inductive errors when precise demanded. Hence, here we report numerical method calculate...
This article presents a numerical analysis and experiment to investigate contact resistivity distribution of no-insulation (NI) high-temperature superconductor (HTS) racetrack coil. Since the coil consists straight curved sections with continuously varing curvatures, local inhomogeneity can occur. We adopt partial element equivalent circuit (PEEC) method this inhomogeneity. A 50-turn NI HTS single pancake test is fabricated figure out discrepancy resistivity, charged up 100 in liquid...
Abstract High magnetic fields are desirable for discovering new particles in particle accelerators. Dipole magnets using superconductors have played a key role creating the required field intensity and uniformity. In contrast, high temperature superconductor (HTS) dipole recently been spotlit because of their ability to generate higher compared low counterpart. Similar needs emerged other magnets, no-insulation (NI) technology is considered feasible option reach by overcoming disadvantages...
This paper presents a system for real-time monitoring spatial and temporal electromagnetic behaviors of high temperature superconductor (HTS) coil with the no-insulation (NI) winding technique. We implemented that consists Hall sensors voltage taps to measure magnetic fields, local voltages. An NI HTS test was wound, combined coil. experimental study performed in liquid nitrogen bath at 77 K, where charged constant ramp rate 0.05 As <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The screening-current-induced stresses are raising growing concerns for the mechanical robustness of REBCO high-field magnets, particularly following 'Little Big Coil' (LBC) experiments, which set a record field 45.5T. In this paper, we examine electromagnetic-mechanical behaviors single-pancake coils, were originally designed as follow-up studies LBCs and tested in ultra-high fields without quench. A comparative study sequential model coupled is carried out, demonstrating perpendicular...
The so-called screening current in a high temperature superconductor (HTS) is well-known phenomenon that has detrimental effects on performance of an HTS magnet. To date, many research efforts have been devoted to suppressing Here, we report customized electric-heater, named “Thermal Eraser,” mitigate the current. key idea optimally control spatial distribution magnet using heater and consequent temperature-dependent local critical wires validate idea, Thermal Eraser was designed,...
We present a recently developed shimming method that uses system of room-temperature (RT) orthogonal coils to improve the spatial field homogeneity high-resolution nuclear magnetic resonance (NMR) and imaging (MRI) superconducting magnets. Conventional RT methods require recursive routines mapping shim coil current adjustments, which lead less effective time-consuming process. In this paper, we introduce new utilizes process gradual automatic search find an optimal operating point with...
This paper presents a numerical method for fast simulation of current distribution in no-insulation (NI) high temperature superconductor (HTS) coil with defects. A refined distributed-circuit model based on the partial element equivalent circuit (PEEC) approach is adopted to calculate transient due screening current. To reduce time required simulation, nonuniform axial segmentation presented which outer axially-subdivided azimuthal narrower than inner element. In order verify method, three...
The plasmonic component of photonic–plasmonic hybrid resonances from a dielectric sphere array on Ag is substantially strengthened by introducing thin coating and TiO<sub>2</sub> passivating layer above below the PS array, respectively.
This work reports a frequency domain analysis on alternating current (AC) response of metal-insulation (MI) high temperature superconducting (HTS) coil. An 85-turn MI test coil was wound and operated in liquid nitrogen bath at 77 K. Sinusoidal applied to the measure AC responses. The coil's total voltage central magnetic field were measured from 0.01 Hz 5 Hz. phase difference between azimuthal calculated data. To explain current, additional frequency-dependent resistive component adopted....
With well-known self-protecting behaviors of no-insulation (NI) high temperature superconductor (HTS) coils, their performance was verified by numerous field magnets. As one the initial investigations NI HTS technique being applied to toroidal (TF) an equivalent circuit analysis is carried out on a D-shaped coil predict its electromagnetic regarding contact resistance, most important parameters for coils. A charging/discharging test performed at 77 K obtain experimental data resistance...
Abstract Considering coil stress management, conductor thermal stability, and susceptibility to delamination, the dry-winding approach has been gradually applied tested in high-temperature-superconducting coils wound with REBa 2 Cu 3 O <?CDATA $_{7-x}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi /> <mml:mrow> <mml:mn>7</mml:mn> <mml:mo>−</mml:mo> <mml:mi>x</mml:mi> </mml:mrow> </mml:msub> </mml:math> (REBCO) coated conductors (CCs). In...
Engineering the admittance of external environments connected to superconducting qubits is essential, as increasing measurement speed introduces spontaneous emission loss qubits, known Purcell loss. Here, we report a broadband filter within small footprint, which effectively suppresses without losing fast speed. We characterize filter's frequency response at 4.3 K and also estimate suppression by finite-element-method simulations planar circuit layouts with proposed design. The fabricated...