IEEE Transactions on Applied Superconductivity最新文献

{"title":"Fabrication and Evaluation of Waveguide Josephson Array Oscillators at Millimeter-Wave Lengths for SIS Mixer-Based Amplifiers","authors":"Yosuke Murayama;Akira Kawakami;Wenlei Shan;Shohei Ezaki;Akihira Miyachi;Sho Masui;Takafumi Kojima;Yoshinori Uzawa","doi":"10.1109/TASC.2024.3515971","DOIUrl":"https://doi.org/10.1109/TASC.2024.3515971","url":null,"abstract":"In this study, a 150 GHz waveguide Josephson array oscillator was designed, fabricated, and evaluated as a local oscillator (LO) source for superconductor-insulator-superconductor (SIS) mixer-based amplifiers. These amplifiers aim to reduce the power consumption of microwave amplifiers used in large-scale multi-pixel heterodyne receivers for radio astronomy and superconducting quantum computers. We fabricated a Josephson array oscillator of 11 Nb/Al–AlO\u0000_x\u0000/Nb Josephson junctions with Cu shunt resistors, each of which is placed on the center of a half-wavelength microstrip line resonator. When the LO signal from the oscillator was introduced into the balanced SIS mixers via a waveguide, the oscillator successfully pumped four SIS mixers simultaneously, delivering a total estimated LO power of 0.22 µW at 146.7 GHz. The SIS mixers operated without a millimeter-wave isolator at an LO noise temperature of 4–6 K. These results indicate the Josephson array oscillator's potential as an LO source for SIS mixer-based amplifiers.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quasi-Lumped Coplanar Waveguide Diplexers for a Multichroic Polarimeter","authors":"Sirui Ren;Tian Xia;Shiling Yu;Yu Wang;Mingzhu Zhang;Yuxin Qiu;Xiaohui Yan;Ruirui Fan;Xucheng Dai;Zhanzhang Mai;Zhongyu Shi;Yue Hong;Liming Zou;Haitao Wang;Hongli Zhu;Jiawei Liu;Haoyu Wang;Weijie Guo;Yiwen Wang;Yanru Song;Xiaohang Zhang;Ran Duan","doi":"10.1109/TASC.2024.3514596","DOIUrl":"https://doi.org/10.1109/TASC.2024.3514596","url":null,"abstract":"This article presents a multichroic Kinetic Inductance Bolometer (KIB) polarimeter that utilizes coplanar waveguide (CPW) diplexers. The CPW diplexers function as filters, providing two passbands centered at 220 GHz and 280 GHz. The high-quality-factor resonant units deliver excellent transmission and isolation characteristics. Additionally, the quasi-lumped-element resonator design enables a significant reduction in size compared to conventional microstrip diplexers. The entire polarimeter—comprising orthomode transducer (OMT) probes, diplexers, KIBs, and CPW feed lines—is integrated on a single plane, allowing for one-layer superconducting thin-film fabrication with a simplified process. The compact size, superior frequency response, and streamlined fabrication process make the proposed pixel scheme suitable for integrated array development.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic Electromagnetic Response of D-Shaped No-Insulation Coil Under Pulse Background Field","authors":"Xueliang Wang;Jie Sheng;Xiao-Fen Li;Shuhao Peng;Zhijian Jin","doi":"10.1109/TASC.2024.3515954","DOIUrl":"https://doi.org/10.1109/TASC.2024.3515954","url":null,"abstract":"REBCO is a representative commercial High Temperature Superconducting (HTS) material. It has great potential for high field applications for instance Tokamak. REBCO is a 2D film with anisotropy. When using tape to wind no-insulation (NI) coil for Toroidal Field (TF) magnet, the thermal stability is guaranteed. However, the Central Solenoid (CS) and Poloidal Field (PF) magnet is working with dynamic pulse field, which may affect the TF magnet. The pulse field perpendicular to the tape of TF magnet can lead screening current or critical current (I\u0000_C\u0000) degradation. In this article, a 58*2 turns D-shaped NI is fabricated as TF magnet. The pulse background field, provided by insulation solenoid coil, is applied on coil to find out its dynamic response at 77 K. Multiple voltage taps are used to monitor the local behavior of NI coil. And high-speed data acquisition system is installed to measure the local voltage. In the results, a typical non-zero voltage is observed.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects on the Magnetic Field Stability of Coupling Currents Existing in a Two-Tape Bundle of a HTS Insert Prototype","authors":"A. Zampa;Y. Tsuchiya;K. Takahashi;T. Okada;S. Awaji;T. Uto;H. Takewa;S. Hanai;S. Ioka;J. Inagaki","doi":"10.1109/TASC.2024.3514994","DOIUrl":"https://doi.org/10.1109/TASC.2024.3514994","url":null,"abstract":"The High Field Laboratory for Superconducting Materials (HFLSM) is developing a 33 T Cryogen-free Superconducting Magnet (CSM). The major part of the magnetic field will be achieved thanks to a High Temperature Superconductor (HTS) insulated insert based on the Robust Coil concept. This design features, for each turn, two tapes wound together, in direct contact to enhance the coil's protection. However, a drawback of this architecture is the development of coupling currents caused by variations in the axial component of the magnetic field. These currents lead to additional losses and affect the quality of the magnetic field. This work focuses specifically on the impact of these coupling currents on the magnetic field quality at the location of the future samples in the context of developing a user magnet. The case study of this work is a large-scale prototype of the future HTS insert. To achieve this objective, numerical simulations were conducted to differentiate what are the qualitative effects of coupling currents and screening currents. The results showed that these currents have opposite effects on the magnetic field at the sample position. Additionally, the large-scale prototype experienced long current plateaus, during which the magnetic field was measured. The variations of the latter were driven by the relaxation of these opposing effects, each exhibiting different rates and relaxation times.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IEEE Transactions on Applied Superconductivity Publication Information","authors":"","doi":"10.1109/TASC.2024.3508414","DOIUrl":"https://doi.org/10.1109/TASC.2024.3508414","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"34 9","pages":"C2-C2"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10791324","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Jc(B, ${rm{theta }}$) on Dynamic Resistance and Total Loss in REBCO Coated Conductors Under Various External Field Orientation","authors":"Wenhao Li;Zhenan Jiang;Jing Chen;Difan Zhou;Chuanbing Cai","doi":"10.1109/TASC.2024.3515963","DOIUrl":"https://doi.org/10.1109/TASC.2024.3515963","url":null,"abstract":"There are many high-temperature superconducting (HTS) devices in which REBCO coated conductors (CCs) are exposed to AC external magnetic fields of various orientations while carrying DC currents. The actual REBCO CCs present complex anisotropies and field dependences, but the effects caused by different J\u0000_c\u0000(\u0000<italic>B</i>\u0000, \u0000<inline-formula><tex-math>${rm{theta }}$</tex-math></inline-formula>\u0000) on the dynamic resistance and AC loss characteristics are not clear. In this paper, the magnetization loss, dynamic resistance, and total loss of the nearly isotropic Shanghai Creative (SCST) CC and the strongly anisotropic Fujikura (FYSC) CC at 77 K are investigated in the range of 0\u0000<inline-formula><tex-math>${rm{^circ }}$</tex-math></inline-formula>\u0000 (perpendicular to the wide surface of the CC) and 75\u0000<inline-formula><tex-math>${rm{^circ }}$</tex-math></inline-formula>\u0000 field angles based on \u0000<italic>H</i>\u0000 formulation. The results exhibit that the magnetization loss and dynamic resistance of the SCST CC are less dominated by the perpendicular field compared to the FYSC CC. Moreover, as the field changes from 0\u0000<inline-formula><tex-math>${rm{^circ }}$</tex-math></inline-formula>\u0000 to 75\u0000<inline-formula><tex-math>${rm{^circ }}$</tex-math></inline-formula>\u0000, the vertical components of both the penetration field and the threshold field for the two CCs vary oppositely. Overall, at near-perpendicular fields, the flux flow resistance first occurs in the FYSC CC, while at near-parallel fields, it appears earlier in the SCST CC. The results also show that large parallel fields increase the proportion of dynamic loss in total loss. These results are expected to give a valuable reference for accurate loss estimation of HTS components such as field windings.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monte Carlo Study on Crystal Growth of BMO-Doped REBCO Films Affected by Growth Conditions","authors":"Y. Ichino;T. Arita;Y. Seike;N. Taoka;T. Mori;K. Horio;A. Ichinose;T. Horide;K. Matsumoto;Y. Yoshida","doi":"10.1109/TASC.2024.3512529","DOIUrl":"https://doi.org/10.1109/TASC.2024.3512529","url":null,"abstract":"This study investigates the formation of BaMO\u0000₃\u0000 (BMO) nanostructures in REBa\u0000₂\u0000Cu\u0000₃\u0000O\u0000<italic>_y</i>\u0000 (REBCO) thin films using Monte Carlo simulations. We explored the effects of deposition conditions, particularly high deposition rates, on nanostructure morphology. Our simulations demonstrate that straight BMO nanorods can form even under rapid deposition when substrate temperature and BMO content are sufficiently high. We employed Bayesian optimization to refine simulation parameters, improving the agreement between simulated and experimental crystal grain densities. While full concordance was not achieved, this approach shows promise for future refinements. Our findings provide insights into artificial pinning center design in REBCO superconducting wires and underscore the potential of combining simulation and optimization techniques in materials science research.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Loss Mechanisms of Epitaxial NbN Coplanar Waveguide Resonators on an MgO Substrate","authors":"Kohki Watanabe;Hiroki Kutsuma;Sunmi Kim;Taro Yamashita","doi":"10.1109/TASC.2024.3513276","DOIUrl":"https://doi.org/10.1109/TASC.2024.3513276","url":null,"abstract":"We investigated the loss mechanisms of superconducting circuits with epitaxially grown NbN(100) on MgO(100) substrates by measuring quarter-wave coplanar waveguide resonators with various strip and slot widths. The power dependence of the internal quality factor and the temperature dependence of the resonance frequency shift were evaluated in a dilution refrigerator. The measurement and analysis of the loss in these resonators indicate that the loss was dominated by a two-level system (TLS) loss and the TLS host materials were primarily distributed at the surface of the substrate.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Computed Models of Natural Radiation Backgrounds in Qubits and Superconducting Detectors","authors":"Joseph Fowler;Ian Fogarty Florang;Nathan Nakamura;Daniel Swetz;Paul Szypryt;Joel Ullom","doi":"10.1109/TASC.2024.3512523","DOIUrl":"https://doi.org/10.1109/TASC.2024.3512523","url":null,"abstract":"Naturally occurring radiation backgrounds cause correlated decoherence events in superconducting qubits. These backgrounds include both gamma rays produced by terrestrial radioisotopes and cosmic rays. We use the particle-transport code Geant4 and the PARMA summary of the cosmic-ray spectrum to model both sources of natural radiation and to study their effects in the typical substrates used in superconducting electronics. We focus especially on three rates that summarize radiation's effect on substrates. We give analytic expressions for these rates, and how they depend upon parameters including laboratory elevation, substrate material, ceiling thickness, and wafer area and thickness. The modeled rates and the distribution of event energies are consistent with our earlier measurement of radiation backgrounds using a silicon thermal kinetic-inductance detector.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Achieving High Jc in High Fields in Multilayer BZO/YBCO Thick Films","authors":"Judy Wu;Victor Ogunjimi;Mary Ann Sebastian;Mohan Panth;Jianan Shen;Matteo Moceri;Aafiya Aafiya;Timothy Haugan;Haiyan Wang","doi":"10.1109/TASC.2024.3512530","DOIUrl":"https://doi.org/10.1109/TASC.2024.3512530","url":null,"abstract":"Improved pinning efficiency of c-axis-aligned BaZrO\u0000₃\u0000 nanorods (BZO-NRs) in BZO/YBa\u0000₂\u0000Cu\u0000₃\u0000O\u0000₇\u0000 nanocomposite thin films was obtained recently using a multilayer (ML) approach, in which diffusion of Ca ions from two thin (Ca\u0000_0.3\u0000Y\u0000_0.7\u0000)BCO spacers (10 nm in thickness) sandwiched with three BZO/YBa\u0000₂\u0000Cu\u0000₃\u0000O\u0000₇\u0000 layers. The subsequent Ca (30% larger)/Cu substitution at the Cu-O planes of YBCO was found energetically preferable by inducing c-axis elongation of the YBa\u0000₂\u0000Cu\u0000₃\u0000O\u0000₇\u0000 lattice near the BZO-NRs/YBa\u0000₂\u0000Cu\u0000₃\u0000O\u0000₇\u0000 interface to enable a coherent interface via reducing the BZO/YBCO lattice mismatch from originally 7.7% to 1.4%, leading to significantly enhanced \u0000<italic>J</i>\u0000_c\u0000 (\u0000<italic>B</i>\u0000) and \u0000<italic>F</i>\u0000_p\u0000 in thin ML films of 150 nm in thickness. This work investigates whether improved pinning could be achievable in thicker BZO-NRs/YBa\u0000₂\u0000Cu\u0000₃\u0000O\u0000₇\u0000 ML films with the thickness increased to 1000 nm. Interestingly, similar pinning enhancement has been observed in thick BZO-NRs/YBa\u0000₂\u0000Cu\u0000₃\u0000O\u0000₇\u0000 ML films across a wide temperature range of 20–80 K. In particular, the thicker BZO-NRs/YBa\u0000₂\u0000Cu\u0000₃\u0000O\u0000₇\u0000 ML films outperform their thinner counterparts in both higher value and less anisotropy of \u0000<italic>J</i>\u0000_c\u0000 (\u0000<italic>B</i>\u0000). At 1000 nm thickness, \u0000<italic>I</i>\u0000_c\u0000 (30 K, 9T) reaches up to ∼680 A/cm-width with a variation of ∼85% over the entire angular range of B field orientations. This result illustrates the critical role of Ca diffusion at the BZO-NRs/YBCO interface for improving pinning efficiency of BZO-NRs in a wide range of temperatures and B fields.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}