IEEE Transactions on Applied Superconductivity最新文献_第8页

Nitronic 50 Steel as a Structural Material for EU-DEMO's Toroidal Field Coils

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-01-09 DOI: 10.1109/TASC.2024.3520938

Jack Greenwood;Xabier Sarasola;Kamil Sedlak

{"title":"Nitronic 50 Steel as a Structural Material for EU-DEMO's Toroidal Field Coils","authors":"Jack Greenwood;Xabier Sarasola;Kamil Sedlak","doi":"10.1109/TASC.2024.3520938","DOIUrl":"https://doi.org/10.1109/TASC.2024.3520938","url":null,"abstract":"We report the results of an exploratory design study for Nitronic 50 (N50) Toroidal Field (TF) coils for the EU-DEMO fusion power plant. N50 is a super-austenitic steel that has a yield stress (<inline-formula><tex-math>${{sigma }_y})$</tex-math></inline-formula> of up to 1500 MPa at 4 K, 50% higher than the conventional structural steels (e.g., 316LN) that have been considered for EU-DEMO so far. 2D mechanical analyses have been performed on the inner legs of 30 different layer-wound and graded TF coil designs from the Swiss Plasma Center (SPC), with different current per turn's (<inline-formula><tex-math>${{I}_t}$</tex-math></inline-formula>’s) and discharge time constants (<inline-formula><tex-math>${{tau }_d}$</tex-math></inline-formula>’s) while maintaining the same ampere-turns in the Winding Pack (WP). We show that there is a wide range of <inline-formula><tex-math>${{I}_t}$</tex-math></inline-formula> and <inline-formula><tex-math>${{tau }_d}$</tex-math></inline-formula> parameter space that allows N50 coils with radial thicknesses of <1100 mm, using materials that are available today. We also show that material and manufacturing development programmes for the insulation and N50 coil case would be needed to unlock all the radial space reductions on offer from N50. If such programmes were successful, then thicknesses as low as 710 mm may be possible with N50 (∼20% lower than the thinnest possible 316LN design). The designs that we have found fit comfortably in the 1400 mm space envelope assigned to the TF coil inner leg in the 2018 EU-DEMO magnet baseline design.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369904","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}

引用次数: 0

Electromagnetic and Cryogenic Conceptual Design of a 20 MW LTS Superconducting Wind Generator

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-01-09 DOI: 10.1109/TASC.2025.3527432

Zhidong Shen;Xiaohua Jiang;Xianrui Huang;Yuguang Sun

{"title":"Electromagnetic and Cryogenic Conceptual Design of a 20 MW LTS Superconducting Wind Generator","authors":"Zhidong Shen;Xiaohua Jiang;Xianrui Huang;Yuguang Sun","doi":"10.1109/TASC.2025.3527432","DOIUrl":"https://doi.org/10.1109/TASC.2025.3527432","url":null,"abstract":"Offshore wind power is trending towards larger capacities and deep-water applications. To accommodate floating platforms in deep water and to avoid reliability issues related to gearboxes, it is essential to enhance the power density of direct-drive wind generators thereby reducing their weight and volume. This paper presents a conceptual design for a 20 MW low-temperature superconducting (LTS) wind generator. A thermosiphon helium piping cooling system, which rotates with the LTS excitation coils as the rotor, is proposed to keep the coils at 4.2 K by circulating helium through gravitational force while rotating without any pump. Using NbTi wires for the excitation coils, the designed sample generator features a radial magnetic flux density of 3 T in the air gap at a rated speed of 10 rpm. The rated voltage and current are 3300 V and 3500 A respectively. By a 2D finite element model, the basic electromagnetic structure is designed that has an air gap diameter of 6 m, an axial length of 1.1 m with 48 poles and 576 slots. The maximum magnetic field of 4.3 T locates inside the NbTi excitation coils. The cryogenic cooling system employs 8 cryostats, each containing six NbTi coils with a carbon fiber reinforced plastic suspension system and a GM cryocooler. The estimated heat leaks for a single cryostat are 0.382 W at 4.2 K and 39.8 W at 50 K.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143360953","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}

引用次数: 0

Simulation of Josephson Junction Circuits With Only Ordinary Differential Equations

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-01-09 DOI: 10.1109/TASC.2025.3527885

Xiangqin Wang;Dan Schult;Ken Segall

引用次数: 0

Evaluation of Bending Properties of REBCO Spiral Conductors

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-01-08 DOI: 10.1109/TASC.2025.3527421

Shinji Fujita;Yuki Nakadai;Shogo Muto;Naonori Nakamura;Masanori Daibo

引用次数: 0

Charge Parity Rates in Transmon Qubits With Different Shunting Capacitors

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-01-08 DOI: 10.1109/TASC.2025.3527425

Yi-Hsiang Huang;Haozhi Wang;Yizhou Huang;Sylvie McKnight-Milles;Zachary Steffen;B. S. Palmer

{"title":"Charge Parity Rates in Transmon Qubits With Different Shunting Capacitors","authors":"Yi-Hsiang Huang;Haozhi Wang;Yizhou Huang;Sylvie McKnight-Milles;Zachary Steffen;B. S. Palmer","doi":"10.1109/TASC.2025.3527425","DOIUrl":"https://doi.org/10.1109/TASC.2025.3527425","url":null,"abstract":"The presence of non-equilibrium quasiparticles in superconducting resonators and qubits operating at millikelvin temperature has been known for decades. One metric for the number of quasiparticles affecting qubits is the rate of single-electron change in charge on the qubit island (<italic>i.e. the charge parity rate). Here, we have utilized a Ramsey-like pulse sequence to monitor changes in the parity states of five transmon qubits. The five qubits have shunting capacitors with two different geometries and fabricated from both Al and Ta. The charge parity rate differs by a factor of two for the two transmon designs studied here but does not depend on the material of the shunting capacitor. The underlying mechanism of the source of parity switching is further investigated in one of the qubit devices by increasing the quasiparticle trapping rate using induced vortices in the electrodes of the device. The charge parity rate exhibited a weak dependence on the quasiparticle trapping rate, indicating that the main source of charge parity events is from the production of quasiparticles across the Josephson junction. To estimate this source of quasiparticle production, we simulate and estimate pair-breaking photon absorption rates for our two qubit geometries and find a similar factor of two in the absorption rate for a background blackbody radiation temperature of <inline-formula><tex-math>$T^*sim$</tex-math></inline-formula> 350 mK.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143106242","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}

引用次数: 0

Numerical Electromagnetic Field Analyses of Spiral Copper-Plated Striated Coated-Conductor (SCSC) Cables Carrying DC Current Subjected to AC Magnetic Fields

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-01-08 DOI: 10.1109/TASC.2025.3527430

Yusuke Sogabe;Sho Honda;Naoyuki Amemiya

{"title":"Numerical Electromagnetic Field Analyses of Spiral Copper-Plated Striated Coated-Conductor (SCSC) Cables Carrying DC Current Subjected to AC Magnetic Fields","authors":"Yusuke Sogabe;Sho Honda;Naoyuki Amemiya","doi":"10.1109/TASC.2025.3527430","DOIUrl":"https://doi.org/10.1109/TASC.2025.3527430","url":null,"abstract":"Dynamic resistances appear in superconductors carrying dc currents subjected to ac magnetic fields. In coated conductors, multifilament structure is considered effective in reducing the dynamic resistance. However, in practical use, the coated conductors are plated with copper for improvement of stability and protection, so that coupling currents are induced under ac magnetic fields and deteriorate the effect of multifilamentation. The Spiral Copper-plated Coated-conductor cable (SCSC cable), which we developed to reduce as losses, might be effective to solve the problem. We conducted electromagnetic field analyses of four different copper-plated coated conductors to prove the effect; straight monofilament, straight multifilament, spiral monofilament, and straight multifilament coated conductors. We show the region where dynamic loss is generated (dynamic region) and then, discuss the difference of dynamic loss and hysteresis loss among the coated conductors. Also, the dynamic resistances in the analyzed coated conductors are compared.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183919","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}

引用次数: 0

Tc Modulation on Iridium-Based Transition Edge Sensor 基于铱的过渡边缘传感器的锝调制

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-01-08 DOI: 10.1109/TASC.2025.3527742

Edvige Celasco;L. Ferrari Barusso;M. De Gerone;D. Grosso;P. Manfrinetti;K. Niazi;F. Caglieris;S. Passaglia;I. Pallecchi;M. Putti;L. Repetto;F. Gatti

{"title":"Tc Modulation on Iridium-Based Transition Edge Sensor","authors":"Edvige Celasco;L. Ferrari Barusso;M. De Gerone;D. Grosso;P. Manfrinetti;K. Niazi;F. Caglieris;S. Passaglia;I. Pallecchi;M. Putti;L. Repetto;F. Gatti","doi":"10.1109/TASC.2025.3527742","DOIUrl":"https://doi.org/10.1109/TASC.2025.3527742","url":null,"abstract":"Iridium is one of the most chemically stable materials and, therefore, suitable for high-performance transition edge sensor (TES) detectors for space applications, where long-term stability (spanning around five to ten years) is required. Thanks to their high stability, these TES detectors could be employed for high-end technological applications, such as nuclear/particle physics, single photon, and X-ray detection. Studying <italic>Tc modulation induced via surface modifications and patterning is an important aspect for the fine-tuning of these detectors. Focused ion beam (FIB) is a suitable method to pattern the material surfaces up to the nanometric scale, which can be applied for material characterization. Thus, this method has been applied in our work to characterize the superconductive transition behavior of 100-nm-thick Ir films (grown on a Si substrate). Here, we report a mechanism to modulate <italic>Tc after FIB patterning. Periodic holes forming either hexagonal or square arrays, with various hole-to-hole distances, were realized and characterized at low temperature. A preliminary simulation has been reported studying the possible behavior of <italic>Tc after FIB patterning.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 2","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184372","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}

引用次数: 0

Development of TES Microcalorimeters With Serpentine Absorbers for Two-Dimensional Position Detection

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-01-08 DOI: 10.1109/TASC.2025.3527415

Tetsuya Tsuruta;Naoko Iyomoto;Yusuke Matsumi;Yuuki Tagawa;Haruto Fujita;Masahiro Kihara;Noriko Yamasaki;Tasuku Hayashi;Yuta Yagi;Kazuhisa Mitsuda;Keisuke Maehata

引用次数: 0

Design and Analysis of Short Period 2G-HTS Undulators 短周期2G-HTS波动器的设计与分析

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-01-08 DOI: 10.1109/TASC.2024.3524211

Ibrahim Kesgin;Mark Jaski

引用次数: 0

Toward Real-Time Electromagnetic Simulations of HTS Non-Insulated Coils Through Proper Orthogonal Decomposition 通过适当正交分解实现 HTS 非绝缘线圈的实时电磁模拟

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-01-07 DOI: 10.1109/TASC.2025.3526741

Stefano Sorti;Lorenzo Balconi;Lucio Rossi;Carlo Santini;Marco Statera

{"title":"Toward Real-Time Electromagnetic Simulations of HTS Non-Insulated Coils Through Proper Orthogonal Decomposition","authors":"Stefano Sorti;Lorenzo Balconi;Lucio Rossi;Carlo Santini;Marco Statera","doi":"10.1109/TASC.2025.3526741","DOIUrl":"https://doi.org/10.1109/TASC.2025.3526741","url":null,"abstract":"Advanced automation tools are promising wide-range solutions for the various problems still affecting High-Temperature Superconducting (HTS) magnets, including Non-Insulated (NI) ones. However, they are not applicable if reliable models that can run in real-time are not available. This article discusses a preliminary solution for this. For this scope, we propose the construction of reduced-order models, derived from 3D physical-based models. A Volume Integral Formulation (VIM) is presented and reduced using a technique called Proper Orthogonal Decomposition (POD). VIM solves for currents in the conducting domains, relying on Biot-Savart for interactions between elements; meshing insulating domains, such as air, is thus not needed. POD is a reduction technique where the most relevant information is retrieved by processing the full-system response through factorizations such as Singular Value Decomposition. The reduced and full models are then compared, showing that the former offers accurate solutions with a fraction of the computation effort of the latter. Finally, some potential applications of this technique are briefly discussed.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183928","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}

引用次数: 0