# IEEE Transactions on Applied Superconductivity

### Early Access Articles

Early Access articles are made available in advance of the final electronic or print versions. Early Access articles are peer reviewed but may not be fully edited. They are fully citable from the moment they appear in IEEE Xplore.

## Filter Results

Displaying Results 1 - 25 of 187
• ### Sense amplifier for spin-based cryogenic memory cell

Publication Year: 2019, Page(s): 1
| | PDF (486 KB)

A clocked DC-to-SFQ converter is used as a sense amplifier to resolve small differences in the output current of a nanocryotron (nTron). The sense amplifier produces a variable number of SFQ pulses to represent different analog states by passing or blocking input clock pulses. This clock is derived from the system clock by synchronizing the read pulse to the same clock signal. These output pulses ... View full abstract»

• ### Optimum Copper Stabilizer Thickness for Symmetric Tape Round (STAR) REBCO Wires with Superior Mechanical Properties for Accelerator Magnet Applications

Publication Year: 2019, Page(s): 1
| | PDF (256 KB)

Symmetric Tape Round (STAR) wires are only 1.6 to 1.9 mm in diameter and are made by winding 2.5 mm wide REBCO tapes on an AWG 18 (1.02 mm diameter) copper wire former. Such ultra-small diameter wires are possible by the use of symmetric tapes where the REBCO film is positioned at the geometric center, close to the neutral axis. Such symmetric tape architecture is achieved by a strategic selection... View full abstract»

• ### Microstructure and Superconducting Properties of Brass Matrix Internal Tin $\rm Nb_{3}Sn$ Wire with Ti doping to Nb core

Publication Year: 2019, Page(s): 1
| | PDF (1911 KB)

$\rm Nb_{3}Sn$ superconducting wires are widely used for high field applications. It is also expected to play a vital role for high field application in the future such as Future Circular Collider (FCC). Further improvement in $J_c$ performance is required to realize FCC. We have been studying the effect of element addition into Cu matrix... View full abstract»

• ### THE OPTIMIZATION OF OXYGEN PARTIAL PRESSURE FOR PREPARING A SUPERCONDUCTING JOINT BETWEEN YGdBCO COATED CONDUCTORS

Publication Year: 2019, Page(s): 1
| | PDF (672 KB)

Superconducting joining technique of REBCO tapes is critical to realize persistent current mode (PCM) applications. In this work, a self-developed connecting method called ‘liquid assist-ed sintering and texture merging ’ was applied to fabricate YGdB-CO superconducting joint. The influence of oxygen partial pres-sure PO2 in recrystallization stage on texture and surface morphol-ogy of YGdBCO sing... View full abstract»

• ### Final design of the current feeders and coil terminal boxes for JT-60SA

Publication Year: 2019, Page(s): 1
| | PDF (1002 KB)

The final design of coil terminal boxes (CTBs) and superconducting feeders for the superconducting magnets of JT-60 super advanced (JT-60SA), which is the tokamak device being built in Japan, have been fixed. Because of the limited space in the torus building, 5 CTBs are distributed around the main cryostat. The CTBs have long horizontal ducts to place the high temperature superconductor current l... View full abstract»

• ### A New Quench Protection System using Dual-Capacitor Switching for Fast Energy Extraction from HTS Magnets

Publication Year: 2019, Page(s): 1
| | PDF (941 KB)

The high-temperature superconducting (HTS) magnets with high magnetic field can be store a relatively large energy because of their large inductance and operating current. The magnetic energy stored in the magnet is converted into heat energy when a quench occurs, and the heat generated by the quench resistance and magnet current is sufficient to damage the magnet. Therefore, the large amount of e... View full abstract»

• ### Investigation on $I_\text{C}$ Degradation of MgB$_{2}$ Rutherford Cables by Deformation During Cabling Process

Publication Year: 2019, Page(s): 1
| | PDF (8910 KB)

MgB$_{2}$ superconductors are promising candidates for application to devices such as SMES, and generators. To apply MgB$_{2}$ conductors to such devices, the current capacity of a conductor must be in the kilo-ampere range. Meanwhile, because the current capacity of a MgB$_{2}$ conductor is typically approxi... View full abstract»

• ### Tore Supra/WEST Toroidal Field Coil Quench following a Plasma Disruption With Runaway Electrons

Publication Year: 2019, Page(s): 1
| | PDF (1171 KB)

Tore Supra/WEST is a Tokamak operating at CEA/IRFM since 1988. Its toroidal field system is composed of 18 NbTi Toroidal Field Coils (TFC) cooled by superfluid helium bath at 1.8 K. The system is used to operate at full current during every day of a plasma campaign, and is protected by a quench detection system (QDS) which can trigger a fast safety discharge (FSD). In De-cember 2017, a FSD was tri... View full abstract»

• ### Development of an HTS accelerator magnet with REBCO coils for tests at HIMAC beam line

Publication Year: 2019, Page(s): 1
| | PDF (1077 KB)

An R & D project funded by the Japan Science and Technology Agency under its S-Innovation Program is currently in progress. The purpose of this project is to develop fundamental technologies for accelerator magnets with REBCO coils. In the first step of this project, winding technology for fabricating REBCO coils required for HTS accelerator magnets was developed. At the last stage of this pro... View full abstract»

• ### Modelling a Transition-Edge Sensor X-ray Microcalorimeter Linear Array for Compton Profile Measurements and Energy Dispersive Diffraction

Publication Year: 2019, Page(s): 1
| | PDF (1187 KB)

Transition-edge sensors are a type of superconducting detector that offers high energy resolution based on their sharp resistance-temperature feature in the superconducting-to-normal transition. TES X-ray microcalormeters have typically been designed and used for spectroscopic applications. In this work, we present a design optimization for a TES X-ray microcalorimeter array for high-energy scatte... View full abstract»

• ### Machine Learning, Markov Chain Monte Carlo and Optimal Algorithms to Characterize the AdvACT kilopixel Transition-Edge Sensor Arrays

Publication Year: 2019, Page(s): 1
| | PDF (523 KB)

Next-generation focal planes comprising dozens of kilopixel Transition-Edge Sensor (TES) arrays require new methods to rapidly screen candidate arrays, evaluate array non-idealities in the field, identify outlier devices for removal, and optimize the array performance in the field. We demonstrate robust methods to estimate TES parameters (critical temperatures and thermal conductivity parameters) ... View full abstract»

• ### Magnetic Design of a Half-size 5T High-Temperature Superconducting Coil for MRI

Publication Year: 2019, Page(s): 1
| | PDF (520 KB)

We have been developing a liquid-helium-free magnet using high-temperature superconducting (HTS) wire for MRI. The aim of this research and development is to commercialize a 3-T HTS magnet for whole body MRI which has the characteristics of being liquid-helium-free, small and light-weight. HTS coil requires tolerance of a high magnetic field, 7 T, and it must have high current density, 200 A/mm View full abstract»

• ### Production and Characterization of Strands for a 35 kA HTS DC Cable Demonstrator

Publication Year: 2019, Page(s): 1
| | PDF (1055 KB)

Over the past years, HTS DC power distribution has received increased attention. One particular scenario is the appli-cation of HTS in energy intensive industries to substitute conven-tional copper or aluminum bus bar systems. The use of HTS in these scenarios creates significant benefits regarding space, weight and system losses. In industrial electrolysis, currents of up to several hundred kilo-... View full abstract»

• ### Over-current test of REBCO pancake coils impregnated with electrically conductive epoxy resin under conduction-cooled conditions

Publication Year: 2019, Page(s): 1
| | PDF (2100 KB)

Since $REBa_{2}Cu_{3}O_{7-\delta}$ (REBCO) coils have high thermal stability, the possibility of quenching is considerably lower than low-temperature-superconducting (LTS) coils. However, if thermal runaway is observed in a conduction-cooled system, a REBCO coil will almost certainly be burned out. A recently reported tech-nique of producing a REBCO coil without turn-... View full abstract»

• ### Digital Output Data Links from Superconductor Integrated Circuits

Publication Year: 2019, Page(s): 1
| | PDF (2371 KB)

Improving the efficiency in digital data transport, originating from 4 K superconductor integrated circuits (ICs) to standard room-temperature (300 K) electronics, both in terms of speed and power consumption, is vitally important for nearly all applications of superconductor digital electronics. The required data link must include all necessary amplification and conditioning to convert digital da... View full abstract»

• ### Diameter Quality Control of $\rm Nb_{3}Sn$ Wires for MQXF Cables in the U.S.

Publication Year: 2019, Page(s): 1
| | PDF (10055 KB)

The 0.850 ± 0.003 mm Nb3Sn wires for the low-beta quadrupole magnets “MQXFA” procured for the U.S. LHC Accel-erator R&D Program (LARP) and the U.S. High Luminosity LHC Accelerator Upgrade Project (US HL-LHC AUP, or simply AUP) are received at Lawrence Berkeley National Laboratory (LBNL). There, the wires are respooled and then fabricated into Rutherford cables for winding coils. As part of the... View full abstract»

• ### Development of fast response Titanium-Gold bilayer optical TES with optical fiber self-alignment structure

Publication Year: 2019, Page(s): 1
| | PDF (717 KB)

We developed a Ti/Au bilayer optical superconducting transition edge sensor (TES) laying on an optical fiber self-aligned structure. The bilayer approach enables us to control the superconducting transition temperature $T_C$, which results in 8-μm-square-sized TES with $T_C$ as high as 314.0 mK. Moreover, the TES device is micro-machined ... View full abstract»

• ### Feasibility Study of Fiber Bragg Grating Sensor for Quench Detection of High Temperature Superconductors

Publication Year: 2019, Page(s): 1
| | PDF (520 KB)

The energy stored in a 2 MW motor coil, or a generator field winding, may be as high as 25 kJ (for a 5 H field windings with 100 A current) and this energy release would be catastrophic if rap-idly released. Therefore quench detection and protection in large machine coils is a significant concern. In this work, the feasibility of uncoated Fiber Bragg Grating (FBG) sensors for high temperature supe... View full abstract»

• ### Advance in Long-length REBCO Coated Conductors Prepared by Reel-to-Reel Metalorganic Solution and Ion-beam-assisted Deposition

Publication Year: 2019, Page(s): 1
| | PDF (1287 KB)

In the present work, we report our recent efforts to improve the homogeneity of MgO buffer layers and superconducting $\rm YBa_{2}Cu_{3}O_{7-\delta}$ (EEBCO) coated tapes prepared by ion-beam-assisted deposition (IBAD) and metalorganic solution deposition (MOD), respectively. Based on previous research results involving fluorine, a reduced atmospheric pressure is used... View full abstract»

• ### Research on Bias Network of Energy-Efficient Single Flux Quantum Circuits

Publication Year: 2019, Page(s): 1
| | PDF (1003 KB)

Superconducting single flux quantum (SFQ) circuits have been shown to offer huge advantages that are ideal for high performance computing applications. These circuits can operate at very high frequencies (tens of GHz) but consume very low power (from nanowatts to microwatts per gate). Energy-efficient SFQ (ERSFQ) circuits, evolved from traditional rapid SFQ (RSFQ) circuits, were invented with the ... View full abstract»

• ### How to Control the Gd211 Particles and Enhance the Levitation Force of Single Domain GdBCO Bulks Prepared by the Gd+011 TSIG Method

Publication Year: 2019, Page(s): 1
| | PDF (915 KB)

In order to control and refine Gd211 particle size in GdBCO bulks, two group of single domain GdBCO bulk superconductors have been prepared with different solid phase pellets sintered at different temperature (T) and times by the Gd+011 TSIG method. The results of the first group of single domain GdBCO bulks indicate that: the average size of Gd211 particles in precursor solid phase pellets increa... View full abstract»

• ### Effect of Post Deposition Annealing on the Structural and Electrical Properties of NbTiN Thin Films Deposited by Reactive Bias Target Ion Beam Deposition Technique

Publication Year: 2019, Page(s): 1
| | PDF (22441 KB)

Nb-based superconducting alloys, such as NbN and NbTiN, can have a superconducting energy gap near twice that of elemental Nb, thus being ideal candidates for low-loss super- conducting circuits operating above the gap frequency of Nb. We are particularly interested in these materials for THz-frequency superconducting-insulating-superconducting (SIS) mixers, kinetic inductance detectors (KID), and... View full abstract»

• ### Diagnosis of factors impacting yield in multilayer devices for superconducting electronics

Publication Year: 2019, Page(s): 1
| | PDF (2910 KB)

The ability to localize defects in order to understand failure mechanisms in complex superconducting electronics circuits while operating at low temperature does not yet exist. This work applies thermally-induced voltage alteration (TIVA), to a biased SCE circuit at ambient temperature. TIVA is a commonly used, laser-based failure analysis technique developed for silicon-based microelectronics. Th... View full abstract»

• ### Globally Asynchronous, Locally Synchronous Clocking and Shared Interconnect for Large Scale SFQ Systems

Publication Year: 2019, Page(s): 1
| | PDF (278 KB)

A globally asynchronous, locally synchronous clocking scheme for large scale single flux quantum (SFQ) systems is proposed. In this scheme, the width of each data bus is extended to carry the corresponding clock signal. This signal activates the distribution of the clock signals within the receiving block. Based on this approach for intra-chip interconnect within SFQ systems, a configurable shared... View full abstract»

• ### High Temperature Superconductor-based Technologies as Enabler for Efficient and Resilient Energy Systems

Publication Year: 2019, Page(s): 1
| | PDF (965 KB)

New technologies based on the use of High Temperature Superconductors (HTS) can lead to higher efficiency and more resilient energy systems. HTS applications are creating unique opportunities for promising commercial components that can enable the needed evolution of the energy system, such as high-capacity power cables, fault current limiters, high-efficiency generators for offshore wind turbines... View full abstract»

## Aims & Scope

IEEE Transactions on Applied Superconductivity contains articles on the applications of superconductivity and other relevant technology.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Alexander Polasek
Electrical Energy Research Center (Cepel)

polasek@cepel.br