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Evolution of phase slips with wire width and observation of critical-voltage feature without high-impedance environment in NbN nanowires Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-23 Xiaoni Wang, Zulei Xu, Xiaoyu Liu, Fei Xu, Yixin Liu, Wanpeng Gao, Yu Wu, Ming Yang, Wei Peng, Zhen Wang, Gang Mu, Zhi-Rong Lin, Xiaoming Xie
Quantum phase slip (QPS) is an important effect that occurs in one-dimensional (1D) or quasi-1D superconducting (SC) materials. Due to the extremely high requirements on the uniformity and quality of SC nanowires, it is currently very challenging to obtain repeatable and controllable QPS devices. Here, we report a systematic study of the QPS effect in NbN SC nanowires. High-quality NbN nanowires with
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Impact of local plastic deformation on thermo-magnetic instability of high-J c Nb3Sn strand Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-23 Yunhao Liu, Yu Wu, Arend Nijhuis, Zichuan Guo, Yi Shi, Fang Liu, Lina Zhu, Chao Dai, Iksang Shin, Kihong Sim, Jinggang Qin
The future fusion reactor devices built by Institute of Plasma Physics, Chinese Academy of Science will be a compact burning plasma facility to fill the gap between ITER and the China Fusion Engineering Test Reactor, with the mission of studying the deuterium–tritium plasma in steady-state operation. The winding-package (WP) of its toroidal field coil is graded into high-field WP and low-field WP,
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Fabrication and properties of lateral Josephson junctions with a RuO2 weak link Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-22 Kumar Prateek, Thomas Mechielsen, Aymen Ben Hamida, Douwe Scholma, Yao Junxiang, Jan Aarts
Ruthenium dioxide (RuO2) is a metallic rutile oxide with a number of interesting properties. For a long time, it was considered to be a highly conductive normal metal and a Pauli paramagnet. Recently, it was found that the material is antiferromagnetic, with small magnetic moments of the order of 0.05 Bohr magneton and an ordering temperature above 300 K. The presence of magnetic moments should have
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In-depth S/TEM observation of Ti–Hf and Ta–Hf-doped Nb3Sn layers Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-22 Nobuya Banno, Taku Moronaga, Toru Hara, Koki Asai, Tsuyoshi Yagai
In superconducting Nb3Sn layers with coherence lengths of approximately 3 nm, grain boundaries act as effective pinning sites. Thus, grain refinement is an essential issue that directly affects the superconducting critical characteristics of the Nb3Sn layer. In recent years, Hf addition to Nb3Sn wires co-doped with Ta has attracted notable interest as a method that enables grain refinement down to
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Superconducting properties of bismuthate/manganite epitaxial multilayers Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-21 Sachio Komori, Tomoyasu Taniyama
We report epitaxial growth and superconducting properties of superconductor/ferromagnet (S/F) multilayers consisting of an s-wave superconducting bismuthate BaPb0.75Bi0.25O3 (BPBO) and a ferromagnetic insulating manganite La0.875Sr0.125MnO3 (LSMO). We demonstrate that the superconductivity of BPBO sandwiched by LSMO is preserved down to a thickness close to the superconducting coherence length. The
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Superconducting nitridized-aluminum thin films Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-14 Alba Torras-Coloma, Leyre Martínez de Olcoz, Eva Céspedes, Elia Bertoldo, David López-Núñez, Sagar Paul, Wolfgang Wernsdorfer, Gemma Rius, P Forn-Díaz
We report the direct observation of superconductivity in nitridized-aluminum thin films. The films are produced by sputtering deposition of aluminum in a controlled mixture of nitrogen diluted in argon. The concentration of applied nitrogen directly determines the properties of the superconducting thin films. We observe samples displaying critical temperatures up to 3.38 ± 0.01 K and resilience to
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High critical current density in low-cost iron-based superconducting round wires annealed at ambient pressure Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-13 Caida Fu, Chiheng Dong, Chang Tu, Meng Han, He Huang, Dongliang Wang, Xianping Zhang, Yanwei Ma
Superconducting round wires with isotropic architecture are preferred in fabrications of cables and magnets. To diminish the obstacles to supercurrent, e.g., voids, cracks and bubbles, over-pressure heat treatment or hot isostatic pressing is indispensable in the final annealing process. Here, we fabricated a stainless steel/Cu/Ag sheathed Ba0.6K0.4Fe2As2 superconducting round wire without the aid
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A proof-of-concept Bitter-like HTS electromagnet fabricated from a silver-infiltrated (RE)BCO ceramic bulk Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-13 R W Taylor, H W Weijers, M D Ainslie, J V J Congreve, J H Durrell, R A Badcock, C W Bumby
A novel concept for a compact high-field magnet coil is introduced. This is based on stacking slit annular discs cut from bulk rare-earth barium cuprate ((RE)BCO) ceramic in a Bitter-like architecture. Finite-element modelling shows that a small 20 turn stack (with a total coil volume of < 20 cm3) is capable of generating a central bore magnetic field of > 2 T at 77 K and > 20 T at 30 K. Unlike resistive
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Fast and accurate electromagnetic modeling of non-insulated and metal-insulated REBCO magnets Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-13 Enric Pardo, Philippe Fazilleau
REBCO high-temperature superconductors are promising for all-superconducting high-field magnets, including ultra-high field magnets. Non-insulated (NI) and metal-insulated (MI) windings are a good solution for protection against electro-thermal quench. Design and optimization requires numerical modelling of REBCO inserts for high-field magnets. Here, we detail a fast and accurate two-dimensional cross-sectional
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Numerical study on the electromagnetic characteristics of multi-layer CORC cables Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-13 Chao Li, Wenchao Yang, Bin Li, Ying Xin, Jiabin Yang
Due to the high isotropy and low AC losses, the multi-layer conductor on round core (CORC) cable is a good candidate for high field magnets, such as central solenoid magnets in fusion. Considering the difficulty in experimental measurement, numerical model is an effective way to illustrate the electromagnetic characteristics of the multi-layer CORC cable and provide further insights into its working
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Low-loss millimeter-wave resonators with an improved coupling structure Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-08 A Anferov, S P Harvey, F Wan, K H Lee, J Simon, D I Schuster
Millimeter-wave superconducting resonators are a useful tool for studying quantum device coherence in a new frequency domain. However, improving resonators is difficult without a robust and reliable method for coupling millimeter-wave signals to 2D structures. We develop and characterize a tapered transition structure coupling a rectangular waveguide to a planar slotline waveguide with better than
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Thermal runaway criterion as a basis for the protection of high-temperature superconductor magnets Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-07 M Marchevsky, S Prestemon
High-temperature superconductor (HTS) based high-field magnet systems are essential for particle accelerators and fusion energy applications. Quench protection of such magnets is difficult owing to a slow quench propagation velocity in HTS. While in conventional NbTi and Nb3Sn-based magnets, a normal zone expands typically quickly, and the stored energy is dissipated across a large volume of the windings
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Monolithic integration of superconducting-nanowire single-photon detectors with Josephson junctions for scalable single-photon sensing Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-06 Saeed Khan, Bryce A Primavera, Richard P Mirin, Sae Woo Nam, Jeffrey M Shainline
We demonstrate superconducting single-photon detectors (SPDs) that integrate signals locally at each pixel. This capability is realized by the monolithic integration of superconducting-nanowire SPDs with Josephson electronics. The motivation is to realize superconducting sensor elements with integrating capabilities similar to their CMOS-sensor counterparts. The pixels can operate in several modes
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Review of materials for HTS magnet impregnation Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-05 Joshua Feldman, Wolfgang Stautner, Christopher Kovacs, Nenad Miljkovic, Kiruba S Haran
Construction of high-temperature superconducting magnets typically involves impregnation of a coil in a liquid medium, such as epoxy, which is then solidified. This impregnation provides mechanical integrity to the magnet and facilitates heat transfer. The choice of material used for impregnation requires careful consideration of the material properties and the performance requirements in order to
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Optimisation of the processing parameters for the fabrication of high-quality joints between Y–Ba–Cu–O single grain, bulk superconductors Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-05 J V J Congreve, Y Shi, H Druiff, A R Dennis, R W Taylor, C W Bumby, D A Cardwell, J H Durrell
High-strength permanent magnets are essential for a wide range of technologies, including levitation devices, motors, generators and magnetic separators. Replacing permanent magnets with single grain, bulk superconductors will enable a step-change in the performance of these technologies by providing an order-of-magnitude increase in magnetic field. However, there remain many key challenges to the
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A 6-around-1 cable using high-temperature superconducting STAR ® wires for magnet applications Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-02 Nathaly Castaneda, Paolo Ferracin, Cyrus Funkhouser, Eduard Galstyan, Hugh C Higley, Sri Ram Korupolu, Goran Majkic, Hoang Nguyen, Soren O Prestemon, Venkat Selvamanickam, Huy Truong, Xiaorong Wang
To generate a dipole field above 20 T, we need high-temperature superconductors, including REBa2Cu3O 7−x (RE = rare earth, rebco) coated conductors. However, the optimal architecture of a high-current flexible rebco cable is not yet settled for high-field magnet applications. Here we report a 6-around-1 cable concept based on the high-temperature superconducting star ® wires. We made two cable samples
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Enhancement of superconductivity by organic flexible substrates in NbSe2 thin flakes Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-02 Da Jiang, Bingxin Chen, Yixin Liu, Wei Peng, Wei Li, Zhenghua An, Gang Mu
The regulation of superconductivity is of great significance in basic physics and device applications. Typically superconductivity can be tuned by chemical doping, gate voltage, and pressure. The interaction between superconductivity and substrates in low-dimensional systems is concerned in recent years, but a systematic and in-depth investigation is still lacking. Here we report a systematic study
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Influence of thickness and domain structure on the vortex instability of superconducting/ferromagnetic bilayers Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-02 G Blatter, M Sirena, Yeonkyu Lee, Jinyoung Yun, Jeehoon Kim, E De Biasi, N Haberkorn
We report on the vortex instability in superconducting/ferromagnetic (FM) bilayers. Samples consisting of a 23 nm thick Mo2N superconducting layer with a capping layer of Co, Fe20Ni80, or FePt ferromagnets were grown by sputtering at room temperature on silicon (100). Our study reveals that the critical vortex velocity in these superconducting bilayers is significantly influenced by the thickness of
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Operation of kinetic-inductance travelling wave parametric amplifiers at millimetre wavelengths Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-02-01 B-K Tan, N Klimovich, R Stephenson, F Faramarzi, P Day
It is expected that the operation of microwave kinetic inductance travelling wave parametric amplifiers (KITWPAs) can be extended to the millimetre (mm) and the sub-mm wavelength range as long as the frequency is below the gap frequency of the superconducting film. This paper presents possible mm-wave designs for KITWPAs based on microstrip transmission lines. Our device is designed based on the BCS
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Superconductivity of amorphous and crystalline Re–Lu films Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-30 Serafim Teknowijoyo, Armen Gulian
We report on superconducting properties of a novel material: rhenium-lutetium films. Different compositions of Re x Lu binary are explored from x ≈ 3.8 to close to pure Re stoichiometry. The highest critical temperature, up to Tc≈ 7 K, is obtained for x ≈ 10.5 in accordance with electron dispersive spectroscopy results. Depending on the deposition conditions, polycrystalline or amorphous films are
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Resistance at 77 K of two Bi-2223 coils with superconducting joints prepared by incongruent melting Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-29 Shintetsu Kanazawa, Chihiro Sekine
A superconducting joint for multi-filamentary Bi2Sr2Ca2Cu3O10+δ (Bi2223) tape, which has applications in nuclear magnetic resonance and magnetic resonance imaging, has been developed based on incongruent melting and multi-junction methods. In this study, the critical current limit, optimal oxygen annealing conditions, and reproducibility of this joint are experimentally evaluated. The results indicate
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Alternative analytical models for HTS tapes considering their AC hysteretic and resistive losses Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-29 João F P Fernandes, Luís F D Bucho, F Ferreira da Silva, Inês S P Peixoto, Silvio Vaschetto, P J Costa Branco
This work proposes two alternative analytical models to evaluate the ac losses of high-temperature superconducting (HTS) tapes during their hysteretic and resistive modes. These models intend to extend the application range of state-of-the-art analytical models for current values higher than the critical one, i.e. for the resistive state, and to correctly predict the ac losses during the transition
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Enhanced performance of GdBCO bulk superconductors by doping a new kind of YGdBa4CuNbO y nanoparticles Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-25 YanLan Cui, WanMin Yang
In this work, a new kind of YGdBa4CuNbO y (YGdNb-11411) nano-particles was designed and sintered using a solid-state reaction method, whereas their impact on the performance of GdBCO bulks was investigated for the first time. From the acquired x-ray diffraction data and scanning electron microscopy imaging results, it was proved that the YGdNb-11411 particles were of excellent chemical stability and
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Low-frequency electron–phonon interaction and superconductivity in L12 -type trialuminides Al3V Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-25 Feihu Liu, Junling Che, Wei Fu, Li-Na Wu
Superconductivity enhancement is often associated with phonon softening by doping or external pressure. In this paper, we report L12 -type trialuminides Al3V as a typical example belonging to this scenario. The electronic, phononic and superconducting properties have been studied by using the first-principle method. Under uniaxial compression, the superconducting transition temperature Tc of Al3V can
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Effect of transverse compressive stress applied at room temperature on Nb3Sn Rutherford cables Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-24 Gilles Lenoir, Kirtana Puthran, Christian Barth, Jérôme Fleiter, Amalia Ballarino
The accelerator magnets for the high luminosity upgrade of the large Hadron collider use Nb3Sn conductor to achieve the required in-field performance. To sustain the Lorentz forces during operation, a pre-compression is applied to the coils during the fabrication of the magnet. This can lead to an irreversible degradation of the Nb3Sn conductor due to its mechanical sensitivity. In this study, the
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Thermal-vibration correlation study for high-temperature superconducting maglev intelligent monitoring based on back propagation neural network analysis Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-22 Peng Pang, Jun Zheng, Yonghai Zhao, Le Xu, Chenling Xian
The internal temperature rise inside the high-temperature superconducting (HTS) superconductor (SC) resulting from irregular magnetic field (MF) above the permanent magnet guideway is a major factor contributing to the decline of levitation performance. Real-time monitoring of the temperature rise inside YBCO SC is an important issue for the safe operation of the maglev train systems. However, the
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Conceptual design and simulation of a thermal matrix-type SFCL Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-22 Zhixing Gui, Yu Wang, Jiming Lu, Zhongming Yan
Simultaneous quench is a prerequisite for achieving high-rated voltage and current in superconducting fault current limiters (SFCLs) based on superconducting thin films. In this article, we propose the T-MSFCLs, i.e. the matrix-type SFCLs (MSFCLs) with thermally-assisted simultaneous quenches, to mitigate hotspot and dielectric breakdown problems. We present the typology of the non-isolated and isolated
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On the coupling of magnetic moments to superconducting quantum interference devices Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-19 J Linek, M Wyszynski, B Müller, D Korinski, M V Milošević, R Kleiner, D Koelle
We investigate the coupling factor φ µ that quantifies the magnetic flux Φ per magnetic moment µ of a point-like magnetic dipole that couples to a superconducting quantum interference device (SQUID). Representing the dipole by a tiny current-carrying (Amperian) loop, the reciprocity of mutual inductances of SQUID and Amperian loop provides an elegant way of calculating ϕμ(r,eˆμ) vs. position r and
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Improving Nb3Sn cavity performance using centrifugal barrel polishing Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-16 Eric Viklund, David N Seidman, David Burk, Sam Posen
In this study we will show a new method of polishing for Nb3Sn cavities known as centrifugal barrel polishing (CBP). Using this method, Nb3Sn coated samples are polished to a surface roughness comparable to a traditional Nb cavity after electropolishing. We also investigate different methods of cleaning the Nb3Sn surface after CBP to remove residual abrasive particles. The polished Nb3Sn surface is
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An experimental study to investigate magnetic field and winding force-dependent contact resistance of NI REBCO coil Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-12 Jeseok Bang, Griffin Bradford, Jonathan Lee, Dmytro Abraimov
This paper reports the magnetic field and winding force-dependent contact resistance, also known as characteristic resistance, of no-insulation (NI) REBCO coil. Three NI coils were wound with different winding forces ( < 1 kgf, 3 kgf, and 5 kgf) using the same REBCO-coated conductor, and they were tested at 4.2 K in a background field of 0, 5, 10, and 14 T. The contact resistance of each coil is measured
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A quench detection method for parallel co-wound HTS coils based on current redistribution Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-12 Changhao Hu, Yi Lin, Yunfei Tan, Lei Wang, Jianzhao Geng
High-temperature superconducting (HTS) coated conductors (CCs) have become the preferred material for superconducting magnet applications due to their high engineering current density and high mechanical strength. However, due to the low quench zone propagation velocity of CCs, magnets wound with CCs suffer from severe quench risks. Therefore, a rapid, sensitive, and reliable quench detection method
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Very strong levitation force and stability achieved with a large MgB2 superconductor disc Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-11 Yiteng Xing, Giacomo Russo, Pier Luigi Ribani, Antonio Morandi, Pierre Bernstein, Julie Rossit, Sebastien Lemonnier, Fabian Delorme, Jacques Noudem
This rapid communication highlights a remarkable achievement obtained with a 120 mm diameter large cylindrical MgB2 bulk: the measurement of magnetic levitation forces up to 700 N at 20 K, levitation being stable up to levitation forces exceeding 400 N. The investigated sample, which has one of the largest dimensions reported in the literature, was fabricated using the unconventional spark plasma sintering
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Correlation of strontium anharmonicity with charge-lattice dynamics of the apical oxygens and their coupling to cuprate superconductivity Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-08 Steven D Conradson, Victor Velasco, Marcello B Silva Neto, Chang-Qing Jin, Wen-Min Li, Li-Peng Cao, Andrea Gauzzi, Maarit Karppinen, Andrea Perali, Sandro Wimberger, Alan R Bishop, Gianguido Baldinozzi, Matthew Latimer, Edmondo Gilioli
By means of Cu K edge x-ray absorption spectra of overdoped high-pressure oxygenated superconducting YSr2Cu2.75Mo0.25O7.54 and Sr2CuO3.3 , we demonstrate a remarkably strong three way correlation between the superconductivity and the local dynamics of their highly anharmonic Cu–Sr and Cu-apical O pairs. We model the latter as aspects of the Internal Quantum Tunneling Polarons (IQTPs) that give the
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Performance of demountable solder joints for no-insulation superconducting coils produced by vacuum pressure impregnation Supercond. Sci. Technol. (IF 3.6) Pub Date : 2024-01-08 Theodore Mouratidis, Dennis G Whyte, Brian LaBombard, William K Beck
No-insulation high temperature superconductor (HTS) stack coils show both increased thermal and electrical stability, and present a simplified geometry for the integration of demountable joints. Demountability is a desirable feature for many superconducting applications including fusion magnets, which motivate this research. In this work, a novel vacuum pressure impregnation (VPI) solder process was
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Overall design of a 5 MW/10 MJ hybrid high-temperature superconducting energy storage magnets cooled by liquid hydrogen Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-29 Meng Song, Xinyu Zou, Tao Ma, Li Li, Feiyang Long, Ying Xu
The integration of superconducting magnetic energy storage (SMES) into the power grid can achieve the goal of storing energy, improving energy quality, improving energy utilization, and enhancing system stability. The early SMES used low-temperature superconducting magnets cooled by liquid helium immersion, and the complex low-temperature cooling system greatly limited the promotion and application
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Quench analysis of a no-insulation REBCO magnet based on the ADI method considering the coupling effect of the cryostat Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-29 Hengkang Zheng, Mengyu Liu, Yunxing Song, Liang Li
A no-insulation (NI) REBCO superconducting magnet is under development at Wuhan National High Magnetic Field Center, China. The magnet with the liquid helium cryostat system has a compact structure to reduce the space required for operation. During a quench, the fast-changing spatial magnetic field around the NI magnet may induce a strong eddy current in the conductive parts of the cryostat. The eddy
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Evidence for current suppression in superconductor–superconductor bilayers Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-27 Md Asaduzzaman, Ryan M L McFadden, Anne-Marie Valente-Feliciano, David R Beverstock, Andreas Suter, Zaher Salman, Thomas Prokscha, Tobias Junginger
Superconducting radio frequency (SRF) cavities, which are critical components in many particle accelerators, need to be operated in the Meissner state to avoid strong dissipation from magnetic vortices. For a defect-free superconductor, the maximum attainable magnetic field for operation is set by the superheating field, Bsh , which directly depends on the surface current. In heterostructures composed
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A protocol for mapping transport current density of REBCO-coated conductor by magneto-optical imaging Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-22 Nana Mu, Cong Liu, Xingyi Zhang
The measurement of transport current density is significant for investigations on improving the properties of REBa2Cu3O7−x (REBCO, where RE refers to rare-earth elements)-coated conductors (CCs). In this work, a protocol for mapping the transport current density of CC by magneto-optical imaging (MOI) is presented. A calibration method is developed based on the non-linear physical governing function
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Variation of effective filament diameter, irreversibility field, anisotropy, and pinning efficiency in Bi-2212 round wires Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-20 Chiara Tarantini, Shaon Barua, Temidayo Abiola Oloye, Fumitake Kametani, Jianyi Jiang, Eric E Hellstrom, David C Larbalestier
In recent years Bi2Sr2CaCu2O x (Bi-2212) received increasing attention due to its round wire multifilamentary architecture, a unique feature in high-Tc superconductor. In fact, round wires are preferable for magnet designs, including solenoids for nuclear magnetic resonance (NMR) or research purpose and accelerator magnets. However, due to the narrow over-pressure heat treatment conditions necessary
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Transport properties of 2H-NbSe2 synthesized by selenization of Nb thin films Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-20 A G Zaitsev, A Beck, D Fuchs, R Hott, R Schneider
A novel method for the synthesis of 2H-NbSe2 thin films by selenization of precursor Nb thin films is reported. The polycrystalline films grow predominantly in the hexagonal 2H-NbSe2 phase with bulk lattice constants. Their remarkable microstructure consists of a three-dimensional network of flake-like grains substantially stacked vertically on the substrate. The electronic transport between 1.2 K
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Nonlinear dynamics of 3D superconducting maglevs with six degrees of freedom: dependence on magnetization strategy and disturbance type Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-19 Chenguang Huang, Yunfei Diao, Yi Liu, Long Chen, Wei Liu, Weifeng Tao, Fusheng Wang
Based on the heat diffusion equation, Maxwell’s equations, and translational and rotational dynamic equations, we establish and theoretically validate an electromagnetic-thermal-mechanical coupling model to analyze the levitation performance during normal operation and the nonlinear dynamic behavior under disturbance for 3D maglev systems composed of a six-degree-of-freedom bulk superconductor (SC)
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Superconducting TSV contact for cryoelectronic devices Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-19 Ivan Filippov, Aleksandr Anikanov, Aleksandr Rykov, Alexander Mumlyakov, Maksim Shibalov, Igor Trofimov, Nikolay Porokhov, Yuriy Anufriev, Michael Tarkhov
This work focuses on the fabrication of niobium through silicon vias (TSV) superconductors interconnects. The effect of supercycle of sequential oxidation and chemical etching process on the through-etch wall quality was investigated. It was experimentally shown that the use of supercycle in the fabrication process leads to significant improvement of the TSV wall quality and removal of the defect type—scallops
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The possible effect of surface barriers on the magnetic levitation of cylindrical superconductors Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-19 Pierre Bernstein, Yiteng Xing, Jacques Noudem, Antonio Morandi, Pier Luigi Ribani, Giacomo Russo
Superconducting magnetic levitation force measurements on large field cooled cylindrical MgB2 bulks with different diameters and thicknesses are reported. For these experiments, a special set-up permitting one to measure forces up to 500 N was used. In contradiction to previous measurements, the obtained force hysteresis cycles could not be reproduced with the analytical mean field model proposed by
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Thermoelectric power of overdoped Tl2201 crystals: charge density waves and T 1 and T 2 resistivities Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-19 J R Cooper, J C Baglo, C Putzke, A Carrington
We report measurements of the in-plane thermoelectric power (TEP) for an overdoped (OD) crystal of the single layer cuprate superconductor Tl2Ba2CuO 6+x (Tl2201) at several hole concentrations (p), from 300 or 400 K to below the superconducting transition temperature (Tc ). For p = 0.192 and 0.220, small upturns in the TEP below 150 K are attributed to the presence of charge density waves (CDW) detected
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Non-spontaneous symmetry breaking, chaos, and universality in 2D superconducting phase transition Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-15 Khenchoul Salah
This research paper explores the intriguing phenomenon of the superconductor-metal–insulator phase transition in thin films, examining it from a theoretical standpoint. Our study revolves around the proposition that the process of U(1) symmetry breaking in the Landau–Ginzburg theory might not be entirely spontaneous. Building on this insight, we derive critical parameters characterizing the superconducting
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On the synthesis methodologies to prepare ‘Pb9Cu(PO4)6O’: phase, composition, magnetic analysis and absence of superconductivity Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-14 Gohil S Thakur, Manuel Schulze, Michael Ruck
We present the results of our various attempts to prepare the purported room-temperature and ambient-pressure superconducting compound ‘Pb9Cu(PO4)6O’ (LK-99). We experimented with various starting materials and used several synthesis techniques, such as reactions in sealed silica tubes or sintering in air, to prepare the reported phase. Repetition of the exact synthesis procedure reported by Lee et
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A flux pump driven non-soldering closed-loop HTS magnet and its electromagnetic-thermal semi-analytical modelling method Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-14 Lingfeng Zhu, Yinshun Wang, Hanzhi Gao, Chengyang Hu, Wei Liu, Jiawen Wang, Yudong Sun
We propose a new flux pump driven non-soldering closed-loop (NSCL) high temperature superconducting (HTS) magnet free of any soldering joints throughout the magnet for persistent current mode (PCM) operation. All the superconducting parts of the magnet are wound directly with HTS closed-loop ring split from an 8 mm REBCO tape using our new cutting scheme free of any soldering requirements. The magnet
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Development and testing of a three-period, subsize 2G AIMI MgB2 planar undulator Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-08 T Garg, J Rochester, M Majoros, C Kovacs, X Peng, M Rindfleisch, S Xue, M Tomsic, D Doll, E W Collings, M D Sumption
Compared to Nb3Sn- and NbTi-wound superconducting undulators (SCUs), MgB2-wound SCUs are of interest for future electron synchrotron beam light sources owing to their higher temperature operating margin and associated stability. In this study, a three-period undulator consisting of twelve racetrack coils wound with 2nd generation (2 G) multifilamentary advanced-internal-magnesium-infiltration MgB2
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Flux jump and mechanical response in inhomogeneous high-temperature superconductor under the pulsed-field magnetization Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-08 Lan Wang, Haowei Wu, Huadong Yong
The high-temperature bulk superconductors with high critical current density are brittle, and can be damaged by large Lorentz forces and thermal stress during magnetization. Several studies have reported the failure of bulk superconductors during flux jumps. In this study, we analyzed the magnetization characteristics and mechanical response of the HTS bulk with inhomogeneous current density along
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Magnetic ac susceptibility of superconducting Ta films for quantum computing Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-08 Juntao Yao, Chenyu Zhou, Pedro Mercado Lozano, Sarah Paone, Mingzhao Liu, Qiang Li
Recently, breakthroughs were reported in the long coherence time (>0.5 ms) transmon qubit using tantalum films (Ta). Identifying the loss mechanism in Ta films will help further improve the performance of Ta-based superconducting qubits. Here, we report a study of superconducting properties in two sets of Ta films grown on c-cut and a-cut sapphires respectively using contact transport and noncontact
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Persistent MgB2 joints for react and wind magnets Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-05 M Guven, P Zagura, C M Barker, M N Kutukcu, S Atamert, C R M Grovenor, S C Speller
Ultra-low resistance joints are a key technology enabling superconducting magnets to operate in persistent mode and to achieve the temporal stability required for nuclear magnetic resonance and magnetic resonance imaging (MRI) applications. High performance superconducting joints are manufactured routinely for Nb–Ti and Nb3Sn magnets, but technologies for joining other technological superconductors
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Magnetic field sensitivity of transition edge sensors Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-05 R C Harwin, D J Goldie, C N Thomas, S Withington
Understanding the magnetic field sensitivity of transition edge sensors (TESs) is vital in optimising the configuration of any magnetic shielding as well as the design of the TESs themselves. An experimental system has been developed to enable the investigation of the applied magnetic field direction on TES behaviour, and the first results from this system are presented. In addition, measurements of
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A novel heater-triggered HTS semi-persistent current switch with high switching-off resistance Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-01 Haowen Tan, Zhen Huang
A semi-persistent current switch (semi-PCS) with a simple fabrication process, high switching-off resistance, and minimal power dissipation during operation is required to realize the semi-persistent mode in a high-temperature superconducting (HTS) magnet. In this study, a semi-PCS with high switching-off resistance was developed by optimizing the HTS tape structure in a heater-triggered semi-PCS.
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Self-protected high-temperature superconducting demonstrator magnet for particle detectors Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-12-01 Joep L Van den Eijnden, Anna K Vaskuri, Benoit Curé, Alexey Dudarev, Matthias Mentink
A high temperature superconducting (HTS) demonstration coil has been developed in the frame of the Experimental Physics department Research and Development program at CERN The magnet extends the recent experimental demonstration of aluminium-stabilised HTS conductors and supports the development of future large scale detector magnets. The HTS magnet has five turns and an open bore diameter of 230 mm
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Temperature dependence of transport critical current density for REBCO superconducting tapes deposited by MOCVD Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-11-28 Qianfu Wang, Ping Jiang, Meng Li, Yaoyao Zhao, Shudong Zhang, Xuefeng Zhang, Yimin Chen
The temperature-dependent transport critical current density ( Jc ) behavior of REBa2Cu3O7−δ (REBCO) superconducting tapes with various RE substitutions and combinations has been systematically studied in the temperature range of 4 K–77 K. The measured Jc values were found to be highly in accordance with JcT,B=Jc(0K,B)(1−T/Tc)s with the values of the exponent coefficients s ranging from 1.9 to 2.6
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Integration of vertically-aligned carbon nanotubes with superconducting nanowire single photon detectors Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-11-27 D S Rampini, C S Yung, B G Oripov, S Woods, J Lehman, S W Nam, A N McCaughan
We report on initial fabrication efforts in the integration of superconducting nanowire single-photon detectors (SNSPDs) with vertically aligned carbon nanotubes (VACNTs) with the goal of creating a wideband single-photon detector. SNSPDs provide high detection efficiencies and low dark count rates, while the VACNTs are excellent broadband optical absorbers. Combining these technologies could potentially
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Electromagnetic force behavior of superconducting bulks passing electromagnetic turnout Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-11-22 Can Peng, Xuanbo Wang, Xucheng Zhou, Wuyang Lei, Xiaoning Liu, Anastasiia A Gerasimenko, Zigang Deng
High temperature superconducting (HTS) Maglev is a promising technology owing to its excellent electromagnetic properties of non-control stability and frictionless. As a critical component of HTS Maglev, the turnout poses challenges due to the use of the permanent magnet guideways (PMGs) that are difficult to switch mechanically. With simple structure and rapid responsiveness, electromagnetic turnout
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A novel joint-less coil: promising unprecedented magnetic field stability to solve the persistent current mode issue in 2G-HTS magnet application Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-11-21 Hao Dong, Daxing Huang, Tongxin Wang, Hongwei Gu, Fazhu Ding
Closed coils fabricated using second generation high temperature superconducting (2G-HTS) coated conductors (CCs) are promising for superconducting magnets, which operating in persistent current mode (PCM) such as magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) systems. However, the fabrication and application of superconducting joints for 2G-HTS CCs still pose a significant challenge
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Modeling methodology for the transformer-rectifier flux pump considering electromagnetic and thermal coupling Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-11-17 Chao Li, Gengyao Li, Ying Xin, Bin Li
High-temperature superconducting (HTS) magnets are promising in the application of high-intensity magnetic field. HTS flux pumps are devices that can charge closed HTS magnets without direct electrical contact. Simulation is an effective way to clarify the physical mechanism and provide further insight into the design of the device. In this work, we propose an accurate and efficient modeling methodology
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Development of metal-insulated iron-based superconducting coils and charging tests under high magnetic fields up to 32 T Supercond. Sci. Technol. (IF 3.6) Pub Date : 2023-11-16 Chunyan Li, Jin Zhou, Yanchang Zhu, Cong Liu, Rui Kang, Yingzhe Wang, Chengtao Wang, Ze Feng, Juan Wang, Xianping Zhang, Dongliang Wang, Donghui Jiang, Chuanying Xi, Xinxing Qian, Fang Liu, Yanwei Ma, Qingjin Xu
To explore the potential of iron-based superconducting (IBS) tapes in high-field applications, IBS pancake coils were dry-wound using the uninsulated IBS tape, supplemented with cowound stainless steel tapes for reinforcement. We have successfully fabricated a double pancake coil (DP-1) and a series-connected coil consisting of six DP coils (DP-6). These coils underwent multiple charging tests in a