# IEEE Transactions on Applied Superconductivity

## Volume 25 Issue 3  Part 1 • June 2015

This issue contains several parts.Go to:  Part 2  | Part 3

## Filter Results

Displaying Results 1 - 25 of 154
• ### [Front cover]

Publication Year: 2015, Article Sequence Number: 0001101
| PDF (41 KB)
• ### IEEE Transactions on Applied Superconductivity publication information

Publication Year: 2015, Article Sequence Number: 0001201
| PDF (132 KB)

Publication Year: 2015, Article Sequence Number: 0001307
| PDF (159 KB)
• ### IEEE Transactions on Applied Superconductivity subject categories for article numbering

Publication Year: 2015, Article Sequence Number: 0001401
| PDF (95 KB)
• ### IEEE Transactions on Applied Superconductivity information for authors

Publication Year: 2015, Article Sequence Number: 0001501
| PDF (30 KB)
• ### ASC 2014 Introduction

Publication Year: 2015, Article Sequence Number: 0100101
| PDF (28 KB) | HTML
• ### 2014 Conference Organization

Publication Year: 2015, Article Sequence Number: 0200108
| PDF (52 KB)
• ### The IEEE Awards in Applied Superconductivity (2014)

Publication Year: 2015, Article Sequence Number: 0300113
| PDF (333 KB)
• ### In memoriam [17 passed members]

Publication Year: 2015, Article Sequence Number: 0400101
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• ### John R. Clem: Contributions to the Phenomenology of Superconductivity

Publication Year: 2015, Article Sequence Number: 0500103
| | PDF (132 KB) | HTML

John Clem, Distinguished Professor of Physics at Iowa State University and Ames Laboratory, who passed away in August 2013, was for many decades one of the world's leading contributors to the phenomenology of superconductivity. Hisfundamental contributions included elucidating domain structures in Type I superconductors, modeling reversiblemagnetization and upper critical field of high temperature... View full abstract»

• ### Modeling Quench Protection Heater Delays in an HTS Coil

Publication Year: 2015, Article Sequence Number: 0500205
Cited by:  Papers (4)
| | PDF (614 KB) | HTML

The purpose of this research was to investigate the efficiency of the state-of-the-art quench protection heater technology applied to a high-temperature superconductor (HTS)-based accelerator type magnet. The heater delays, i.e., the time delay between the heater activation and consequent normal zone initiation in the winding, were simulated using the 2-D thermal modelling tool CoHDA, which has be... View full abstract»

• ### Design of a Cooling System for a REBCO Insert Coil in a Cryogen-Free 25 T Superconducting Magnet

Publication Year: 2015, Article Sequence Number: 0500304
Cited by:  Papers (7)
| | PDF (653 KB) | HTML

A cryogen-free 20 T superconducting magnet with a 52 mm room-temperature bore was developed and installed in Tohoku University in 2013. This magnet consists of a Bi2223 insert coil, which generates 4.5 T, and outer low-temperature superconducting (LTS) coils. Both coils were cooled by a GM/JT cryocooler with 4.2 W-class cooling capacity at 4.3 K. To generate a higher magnetic field, a new cryogen-... View full abstract»

• ### Strong Focusing Cyclotron and Its Applications

Publication Year: 2015, Article Sequence Number: 0600104
Cited by:  Papers (1)
| | PDF (835 KB) | HTML

A Strong Focusing cyclotron has been developed by the Accelerator Research Lab at Texas A&M to produce up to 10 mA of proton beam at 800 MeV. The cyclotron has several innovations that allow it to achieve such high levels of power. The first is the superconducting RF cavities that provide sufficient gain to separate the orbits by a minimum of 6 cm. This space allows for beam transport channels to ... View full abstract»

• ### Cryogenic Thermal Modeling and Experimental Validation of a Novel Heat Sink for Helium Gas Cooled Superconducting Devices

Publication Year: 2015, Article Sequence Number: 0600204
| | PDF (571 KB) | HTML

Terminations are an essential part of any superconducting cable system since they maintain the cryogenic environment for the HTS superconductor by intercepting the heat leak from the ambient into the cryogenic system. Due to phase change high pressurization effects and asphyxiation hazards, the use of liquid cryogens on shipboard power systems is unacceptable. Hence, cable terminations, represente... View full abstract»

• ### Toward $\hbox{YBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7-\delta}$ Nanoscale Structures for Hybrid Devices

Publication Year: 2015, Article Sequence Number: 1100104
Cited by:  Papers (5)
| | PDF (555 KB) | HTML

An ex situ ozone annealing has been applied both on YBa2Cu3O7-δ (YBCO) films and nanowires. From the investigation on bare films, by measuring the superconducting resistive transition in temperature and the X-ray diffraction pattern, we have observed that the ozonation can be a powerful tool to oxygenate the YBCO structure. To probe the effective role of thi... View full abstract»

• ### Fabrication and Characterization of Epitaxial TiN-Based Josephson Junctions for Superconducting Circuit Applications

Publication Year: 2015, Article Sequence Number: 1100204
Cited by:  Papers (1)
| | PDF (606 KB) | HTML

We investigated full-epitaxial TiN/AlN/TiN Josephson junctions on MgO substrates for superconducting qubit applications. The critical temperature (TC) of TiN film is relatively low at around 5 K, but its lattice constant is about 0.424 nm, which is close to the lattice constant of MgO of 0.421 nm. TiN and AIN films were prepared by DC magnetron sputtering in a load-lock sputtering syste... View full abstract»

• ### Rapid Single-Flux-Quantum Circuits Fabricated Using $\hbox{20}\hbox{-}\hbox{kA}/\hbox{cm}^{2}$ $\hbox{Nb}/\hbox{AlO}_{x}/\hbox{Nb}$ Process

Publication Year: 2015, Article Sequence Number: 1100304
Cited by:  Papers (4)
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We designed and fabricated rapid single-flux-quantum (RSFQ) circuits using a new 20-kA/cm2 process based on conventional Nb/AlOx/Nb Josephson junction (JJ) technology. Circular JJs were fabricated to improve their uniformity. They had sufficiently low spread of the critical currents for large-scale RSFQ circuits. We selected the circuit design parameters carefully, including ... View full abstract»

• ### Planarized, Extendible, Multilayer Fabrication Process for Superconducting Electronics

Publication Year: 2015, Article Sequence Number: 1100405
Cited by:  Papers (6)
| | PDF (960 KB) | HTML

We report on technique and results for superconductor electronics fabrication process, featuring customizable number of planarized superconducting layers. The novel technique enhanced yield on stackable vias of our standard planarized process (RIPPLE) by eliminating the need for an additional deposition of aluminum as an etch stop in the metal-via stack. The drawback of the previous approach was t... View full abstract»

• ### Superconducting TiN Films Sputtered Over a Large Range of Substrate DC Bias

Publication Year: 2015, Article Sequence Number: 1100505
Cited by:  Papers (1)
| | PDF (547 KB) | HTML

We have investigated properties of superconducting titanium nitride (TiN) films that were sputtered over a large range of RF-induced DC bias voltage applied to the substrate. Films grown with the largest bias voltages contained cubic TiN phases with a large fraction of the (200) crystalline growth orientation. These films also contained the smallest concentrations of oxygen impurities, resulting i... View full abstract»

• ### Study of $\hbox{MgB}_{2}$ Josephson Junction Arrays and Sub- $\mu\hbox{m}$ Junctions

Publication Year: 2015, Article Sequence Number: 1100604
Cited by:  Papers (3)
| | PDF (734 KB) | HTML

Sandwich-type MgB2/MgO/MgB2 Josephson junctions with sizes ranging from 0.5 μm × 0.5 μm to 10 μm × 10 μm were fabricated using electron beam lithography. The junctions show critical current densities as high as 130 kA/cm2. The smallest of the junctions operated free of hysteresis below 4.2 K. They may be ideal for use in ra... View full abstract»

• ### Improved $\hbox{All-MgB}_{2}$ Toggle Flip-Flop Circuit With Increased Operating Speed and Temperature Range

Publication Year: 2015, Article Sequence Number: 1100704
| | PDF (744 KB) | HTML

We have fabricated and tested rapid single flux quantum toggle flip-flop circuits using self-shunted MgB2/ MgO/MgB2 Josephson junctions with a single ground layer. The MgB2 films were deposited using HPCVD, and the MgO barrier was deposited using DC reactive sputtering. We highlight the circuit's voltage divider operation dependence on current bias and temperature ... View full abstract»

• ### Controlling the Interface Properties of Submicrometric Nb/A– $hbox{AlO}_{rm x}$–Nb Josephson Junctions

Publication Year: 2015, Article Sequence Number: 1100804
Cited by:  Papers (1)
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Submicron Josephson devices are of a particular interest to the emerging field of quantum information, nanosized superconducting quantum interference devices (nano-SQUID) fabrication, AC voltage synthesis circuits for quantum metrology, etc. In this paper, we report on the development of our technology for producing non-hysteretic Nb/A-AlOx-Nb four-layered junctions with a diverse range... View full abstract»

• ### Inductance of Circuit Structures for MIT LL Superconductor Electronics Fabrication Process With 8 Niobium Layers

Publication Year: 2015, Article Sequence Number: 1100905
Cited by:  Papers (11)
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Inductance of superconducting thin-film inductors and structures with linewidth down to 250 nm has been experimentally evaluated. The inductors include various striplines and microstrips, their 90° bends and meanders, interlayer vias, etc., typically used in superconducting digital circuits. The circuits have been fabricated by a fully planarized process with 8 niobium layers, developed at ... View full abstract»

• ### 300-GHz Operation of Divider Circuits Using High- $J_{c}\ \hbox{Nb/Nb}_{x}\hbox{Si}_{1-x}/\hbox{Nb}$ Josephson Junctions

Publication Year: 2015, Article Sequence Number: 1101005
Cited by:  Papers (1)
| | PDF (542 KB) | HTML

We investigated high-current-density Josephson junctions with NbxSi1-x barriers in single-flux-quantum (SFQ) digital circuits to evaluate their performance at clock frequencies of hundreds of gigahertz. We fabricated static divider SFQ circuits with a-NbxSi1-x and a-Si barriers for Jc ranging from 3.5 to 85 kA/cm2. For junctions in ... View full abstract»

• ### Inductance and Coupling of Stacked Vias in a Multilayer Superconductive IC Process

Publication Year: 2015, Article Sequence Number: 1101104
Cited by:  Papers (2)
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With many advanced superconductive integrated circuit fabrication processes now moving to multiple ground/shield layers and buried signal lines, and gate dimensions shrinking, the inductance of stacked vias becomes significant. Analytical and two-dimensional inductance calculation methods cannot account for stacked via inductance. Here we show experimental test structures devised to verify the cal... 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
Britton L. T. Plourde
Syracuse University
bplourde@syr.edu
http://asfaculty.syr.edu/pages/phy/plourde-britton.html