Superconductor Science and Technology最新文献

{"title":"Fast and accurate 3D FEM model for electromagnetic simulations of no-insulation HTS coils based on polygon-anisotropic-resistivity","authors":"Zhuoyan Zhong, Wei Wu, Zhijian Jin","doi":"10.1088/1361-6668/ad68d6","DOIUrl":"https://doi.org/10.1088/1361-6668/ad68d6","url":null,"abstract":"For no-insulation (NI) high-temperature superconducting (HTS) coils, a 3D electromagnetic model, which is fast and accurate, conducive to establish, and straightforward to multi-physics coupling, is still required. This paper introduces a polygon-anisotropic-resistivity (PAR) method for 3D FEM electromagnetic simulations of NI HTS coils. This model avoids dividing each tape into the specific HTS-tape layer and turn-to-turn contact layer, which yields: (1) a reduced computational burden; (2) improved convergence due to smaller element aspect ratios. The significance of the PAR method lies in its indispensable role in achieving a 3D anisotropic-resistivity model with high computing speed and accuracy. The proposed PAR model is rigorously evaluated through three types of simulations: (1) charge and discharge tests; (2) AC losses of the NI coil subjected to AC fields with a DC current supply; (3) heat-triggered quench and recovery scenarios. For these simulations, the PAR model is validated by comparisons with the full-element model, namely, the 3D FEM model that explicitly incorporates each specific HTS-tape layer and turn-to-turn contact layer in the <italic toggle=\"yes\">H</italic>-formulation model, and is also validated by previous experimental data for AC losses. Good consistency is observed. The computing speed of the PAR model is tested to be 12–38 times that of the full-element model with the same accuracy. The PAR model achieves a 40% reduction in degrees of freedom compared to the full-element model, with the same mesh density along the HTS tape width and length, facilitating more precise and larger scale coil simulations within the same computational memory limits. Additionally, the PAR model entirely eliminates the inherent inaccuracies found in the conventional-anisotropic-resistivity 3D model, which stem from discrepancies between the arranged anisotropic-resistivity and the actual computed coil meshes. The proposed PAR model will enhance the prevalence of 3D electromagnetic analyses of NI HTS coils.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The A-15-type superconducting hydride La4H23: a nanograined structure with low strain, strong electron-phonon interaction, and a moderate level of nonadiabaticity","authors":"Evgeny F Talantsev, Vasiliy V Chistyakov","doi":"10.1088/1361-6668/ad637e","DOIUrl":"https://doi.org/10.1088/1361-6668/ad637e","url":null,"abstract":"For seven decades, when referring to A-15 superconductors, we meant metallic A&lt;sub&gt;3&lt;/sub&gt;B alloys (where A is a transition metal, and B is group IIIB and IVB elements) discovered by Hardy and Hulm (1953 &lt;italic toggle=\"yes\"&gt;Phys. Rev.&lt;/italic&gt; &lt;bold&gt;89&lt;/bold&gt; 884). Nb&lt;sub&gt;3&lt;/sub&gt;Ge exhibited the highest superconducting transition temperature, &lt;italic toggle=\"yes\"&gt;T&lt;sub&gt;c&lt;/sub&gt;&lt;/italic&gt; = 23K, among these alloys. One of these alloys, Nb&lt;sub&gt;3&lt;/sub&gt;Sn, is the primary material in modern applied superconductivity. Recently, Guo &lt;italic toggle=\"yes\"&gt;et al&lt;/italic&gt; (2024 &lt;italic toggle=\"yes\"&gt;Natl Sci. Rev.&lt;/italic&gt; nwae149, &lt;ext-link ext-link-type=\"uri\" xlink:href=\"https://doi.org/10.1093/nsr/nwae149\"&gt;https://doi.org/10.1093/nsr/nwae149&lt;/ext-link&gt;) extended the family of superconductors where the metallic ions are arranged in the beta tungsten (A-15) sublattice by observation of &lt;italic toggle=\"yes\"&gt;T&lt;sub&gt;c&lt;/sub&gt;&lt;/italic&gt;&lt;sub&gt;,zero&lt;/sub&gt; = 81K in the La&lt;sub&gt;4&lt;/sub&gt;H&lt;sub&gt;23&lt;/sub&gt; phase compressed at &lt;italic toggle=\"yes\"&gt;P&lt;/italic&gt; = 118 GPa. Despite the fact that La&lt;sub&gt;4&lt;/sub&gt;H&lt;sub&gt;23&lt;/sub&gt; has much lower &lt;italic toggle=\"yes\"&gt;T&lt;sub&gt;c&lt;/sub&gt;&lt;/italic&gt; in comparison with the near-room-temperature superconducting LaH&lt;sub&gt;10&lt;/sub&gt; phase (&lt;italic toggle=\"yes\"&gt;T&lt;sub&gt;c&lt;/sub&gt;&lt;/italic&gt;&lt;sub&gt;,zero&lt;/sub&gt; = 250K at &lt;italic toggle=\"yes\"&gt;P&lt;/italic&gt; ∼ 200 GPa) discovered by Drozdov &lt;italic toggle=\"yes\"&gt;et al&lt;/italic&gt; (2019 &lt;italic toggle=\"yes\"&gt;Nature&lt;/italic&gt; &lt;bold&gt;569&lt;/bold&gt; 531), La&lt;sub&gt;4&lt;/sub&gt;H&lt;sub&gt;23&lt;/sub&gt; holds the record for the highest &lt;italic toggle=\"yes\"&gt;T&lt;sub&gt;c&lt;/sub&gt;&lt;/italic&gt; within the A-15 family. Cross &lt;italic toggle=\"yes\"&gt;et al&lt;/italic&gt; (2024 &lt;italic toggle=\"yes\"&gt;Phys. Rev.&lt;/italic&gt; B &lt;bold&gt;109&lt;/bold&gt; L020503) confirmed the high-temperature superconductivity in compressed La&lt;sub&gt;4&lt;/sub&gt;H&lt;sub&gt;23&lt;/sub&gt;. In this paper, we analyzed available experimental data measured in La&lt;sub&gt;4&lt;/sub&gt;H&lt;sub&gt;23&lt;/sub&gt; and found that this superconductor exhibits a nanograined structure, 5.5 nm ⩽ &lt;italic toggle=\"yes\"&gt;D&lt;/italic&gt; ⩽ 35 nm, low crystalline strain, &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $left| {{varepsilon }} right|$?&gt;&lt;/tex-math&gt;&lt;mml:math overflow=\"scroll\"&gt;&lt;mml:mrow&gt;&lt;mml:mrow&gt;&lt;mml:mo&gt;|&lt;/mml:mo&gt;&lt;mml:mrow&gt;&lt;mml:mrow&gt;&lt;mml:mi&gt;ε&lt;/mml:mi&gt;&lt;/mml:mrow&gt;&lt;/mml:mrow&gt;&lt;mml:mo&gt;|&lt;/mml:mo&gt;&lt;/mml:mrow&gt;&lt;/mml:mrow&gt;&lt;/mml:math&gt;&lt;inline-graphic xlink:href=\"sustad637eieqn1.gif\"&gt;&lt;/inline-graphic&gt;&lt;/inline-formula&gt; ⩽ 0.003, strong electron–phonon interaction, 1.5 ⩽ λ&lt;sub&gt;e-ph&lt;/sub&gt;⩽ 2.55, and a moderate level of nonadiabaticity, 0.18 ⩽ Θ&lt;italic toggle=\"yes\"&gt;&lt;sub&gt;D&lt;/sub&gt;&lt;/italic&gt;/&lt;italic toggle=\"yes\"&gt;T&lt;/italic&gt;&lt;sub&gt;F&lt;/sub&gt; ⩽ 0.22 (where Θ&lt;italic toggle=\"yes\"&gt;&lt;sub&gt;D&lt;/sub&gt;&lt;/italic&gt; is the Debye temperature, and &lt;italic toggle=\"yes\"&gt;T&lt;/italic&gt;&lt;sub&gt;F&lt;/sub&gt; is the Fermi temperature). We found that the derived Θ&lt;italic toggle=\"yes\"&gt;&lt;sub&gt;D&lt;/sub&gt;&lt;/italic&gt;/&lt;italic toggle=\"yes\"&gt;T&lt;/italic&gt;&lt;sub&gt;F&lt;/sub&gt; and &lt;italic toggle=\"yes\"&gt;T&lt;sub&gt;c&lt;/sub&gt;&lt;/italic&gt;/&lt;italic toggle=\"yes\"&gt;T&lt;/italic&gt;&lt;sub&gt;F&lt;/sub&gt; values for the La&lt;sub&gt;","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"102 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of K excess in microstructure of (Ba0.6K0.4)Fe2As2 superconducting powders","authors":"Emilio Bellingeri, Cristina Bernini, Federico Loria, Andrea Traverso, Alessandro Leveratto, Valeria Braccini, Amalia Ballarino, Andrea Malagoli","doi":"10.1088/1361-6668/ad68d4","DOIUrl":"https://doi.org/10.1088/1361-6668/ad68d4","url":null,"abstract":"Iron-based superconductors (IBSs) are promising for high-field applications due to their exceptional characteristics, like ultrahigh upper critical field and minimal electromagnetic anisotropy. Creating multifilamentary superconducting wires with elevated transport critical current density is essential for practical use. The Powder in Tube (PIT) technique is commonly used for this purpose, but achieving optimal results requires careful exploration of powder microstructural properties. This is particularly crucial for superconductors like (Ba,K)122, the IBS most promising from an applicative point of view, where factors such as reactivity, volatility, and toxicity of constituent elements affect phase formation. Potassium volatility often leads to nonstoichiometric conditions, introducing excess potassium in the formulation. This study focuses on the impact of potassium excess <italic toggle=\"yes\">δ</italic> on the microstructural properties of the ‘optimally doped’ (Ba_0.6K_{0.4+<italic toggle=\"yes\">δ</italic>})Fe₂As₂ phase (0 ⩽ <italic toggle=\"yes\">δ</italic> ⩽ 0.08). Using techniques like Scanning Electron Microscopy, x-ray diffraction, and temperature-dependent magnetization measurements, we demonstrate the ability to produce nearly pure powders of the superconducting phase with controlled grain size. Our findings are relevant for PIT wire fabrication, where grain size strongly affects mechanical deformation. Grain size also influences transport properties, as observed in previous studies, where reducing grain size enhanced current-carrying capability at high magnetic fields.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the effect of rolling deformation on the electro-mechanical limits of Nb3Sn wires produced by RRP® and PIT technologies","authors":"T Bagni, C Calzolaio, G Bovone, J Ferradas-Troitino, C Barth, A Ballarino and C Senatore","doi":"10.1088/1361-6668/ad6a9c","DOIUrl":"https://doi.org/10.1088/1361-6668/ad6a9c","url":null,"abstract":"Future high-field magnets for particle accelerators hinge on the crucial development of advanced Nb3Sn wires engineered to withstand the large stresses generated during magnet assembly and operation. The superconducting properties of Nb3Sn enable the design of compact accelerator-quality magnets above 10 T, but at the same time the brittleness and strain sensitivity of the material impose careful consideration of the mechanical limits. In addition, accelerator magnets are wound using Rutherford cables and the cabling process generates deformations in the wire that can affect its electro-mechanical performance. This paper reports on the impact of the rolling deformation on the transverse stress tolerance of high-performance restacked-rod-process (RRP®) and powder-in-tube (PIT) Nb3Sn wires. Rolling deformation was used to mimic the effect of cabling on the wire shape. Deformed samples were compared to reference round wires in term of stress dependence and irreversible limit (σirr) of the critical current (Ic) under transverse compressive loads up to 240 MPa. Experiments were performed at 4.2 K, 19 T, on resin-impregnated single wires that imitate the operating conditions in a Rutherford cable of an accelerator magnet. The results show that rolling deformation has a detrimental effect on the initial Ic of PIT wires, but it does not influence the behavior of the wire under stresses above 70 MPa. On the other hand, the deformation of RRP® wires leads to an improved σirr without affecting the initial Ic. Additionally, a 2D-mechanical finite element method model of the RRP® wire was developed to investigate the impact of the wire geometry on the plastic deformation of the copper matrix, which induces residual stresses on Nb3Sn and is the main cause for the permanent reduction of Ic. Based on the model results, an alternative layout of the wire was proposed that improves its stress tolerance without affecting its electrical transport properties.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"99 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elastic-plastic conductor damage evaluation at over 0.4% strain using a high-stress REBCO coil","authors":"Jeseok Bang, Griffin Bradford, Kwangmin Kim, Jonathan Lee, Anatolii Polyanskii and David Larbalestier","doi":"10.1088/1361-6668/ad6a9d","DOIUrl":"https://doi.org/10.1088/1361-6668/ad6a9d","url":null,"abstract":"Recent reports on screening current stress simulations of high-field REBCO magnets frequently present peak stresses over 1 GPa. However, this result is probably an unrealistic artifact of purely elastic calculations, considering the macroscopic yield and fracture stresses of approximately 900 MPa and less than 1.1 GPa for Hastelloy substrate-coated conductors. Here, we evaluate elastic-plastic conductor damage at over 0.4% strain using a high-stress REBCO coil exposed to a high field to explore this elastic-plastic regime. The coil was located off-center in a low-temperature superconductor magnet so as to induce a significant screening current in the enhanced radial field. Voltage taps, a Hall sensor, and two strain gauges were used for the instrumentation. We obtained strains exceeding 0.4% near the outward edge during the coil current charge from 350 A to 390 A, where the coil was exposed to external axial and radial magnetic fields of 13 T and 0.5 T. Post mortem results showed wavy plastic deformation, electrical damage, and REBCO defects. An elastic-plastic simulation reproduced the measured strains and predicted that ∼1 GPa stress is sufficient to induce ∼0.9% strain, thus validating our initial concerns with purely elastic models. This paper provides our experimental and simulation results.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of nitrogen content on the structure and superconductivity of reactive sputtered NbTiN thin films","authors":"L Zhang, Y L Zhong, J J Xie, H Jin, W B Zhao, W Peng, L Chen and Z Wang","doi":"10.1088/1361-6668/ad6adc","DOIUrl":"https://doi.org/10.1088/1361-6668/ad6adc","url":null,"abstract":"In this research, we have studied the structural and electrical properties of NbTiN films deposited on MgO and SiO2/Si substrates by reactive dc sputtering. The formation of stoichiometric NbTiN is very sensitive to N concentration and can be easily adjusted by changing the discharge current and Ar: N2 ratio along the current–voltage curves (IVCs) of the NbTi target. Excessive or insufficient N concentration in NbTiN leads to sublattice expansion or distortion, resulting in a decrease in critical temperature Tc. At Ar: N2 ratio of 30:4 and discharge current of 2.2 A, Tc as high as 15.8 K and 15.3 K has been obtained for 200 nm thick NbTiN/MgO and NbTiN/SiO2/Si samples, respectively. In addition, the critical density Jc of the 4 μm-wide and 7 nm-thick NbTiN film grown on MgO substrate at 2 K reaches 19.2 MA cm−2, which is approximately twice as high as the 10.9 MA cm−2 of the same-sized NbTiN film grown on SiO2/Si substrate. Therefore, by further fine-tuning the N concentration in combination with the IVCs of the target, high-quality stoichiometric NbTiN can be obtained.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A fully superconducting magnetic bearing with a jointless coil excited by a superconducting dynamo","authors":"T. Espenhahn, R. Hühne","doi":"10.1088/1361-6668/ad6d9d","DOIUrl":"https://doi.org/10.1088/1361-6668/ad6d9d","url":null,"abstract":"\u0000 Superconducting magnetic bearings usually combine a setup of permanent magnets and superconducting bulks. The bearing size is typically scaled up to increase the levitation force as the force density is limited in such setups due to the magnetic flux density and its spatial gradient. As alternative, the permanent magnets might be replaced by a superconducting coil. To test this, jointless coils were prepared by a wind and flip technology using coated conductors of different tape manufacturers. The realized pancake coils were studied at liquid nitrogen temperature. Numerical simulations yielded a magnetic field of up to 0.5 T at 77 K for coils with a inner diameter of 20 mm. The prepared coils were charged with a superconducting dynamo, in which two magnet configurations were tested. A clear dependence on the magnet size and frequency was found for the charging characteristics. A magnetic field of about 0.3 T at 77 K was imprinted in one of the coils. However, a degradation of the coils was found over time indicated by some delamination at the cutted edges, which reduced the maximum achievable magnetic field after a few weeks. Nevertheless, a fully superconducting bearing was realized with by combining the jointless coil with an additional YBCO bulk. After charging the coil with the dynamo, a levitation force of up to 10 N at 77 K was measured under zero-field cooling conditions. The generated levitation force decayed only slightly after charging indicating low losses in the coil.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"18 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141925048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase formation and kinetic analysis of (Ba, K)Fe2As2 superconductor","authors":"Xinyuan Liu, Xianping Zhang, C. Dong, Minghui Tang, C. Yao, Wenchao Li, Dongliang Wang, Yanwei Ma","doi":"10.1088/1361-6668/ad6d9b","DOIUrl":"https://doi.org/10.1088/1361-6668/ad6d9b","url":null,"abstract":"\u0000 122-type iron-based superconductors have attracted significant attention owing to their potential for high-field applications. Therefore, the study of the reaction mechanism is indispensable. In this work, the phase formation process and reaction kinetics of the Ba-K-Fe-As system were investigated in comparison with the Fe-As and Ba-Fe-As systems. Our findings suggest two main stages of the phase formation process: formation of the iron arsenide phase and its transformation to the 122-phase. It shows that FeAs forms slowly below 300°C in the Ba-K-Fe-As system, and the formation significantly accelerates at ~400°C. KFe2As2 starts to generate at ~640°C and gradually transforms into Ba0.6K0.4Fe2As2. Furthermore, using the Flynn-Wall-Ozawa method and the Kissinger method, the kinetic parameters of the exothermic peak at ~400-580°C for these three systems were obtained, including the most probable mechanism function f(α), apparent activation energy E, and apparent pre-exponential factor A. Our results suggest that all three systems exhibit complex reactions characterized by f(α) = (1-α)n (1 < n < 2). The presence of the kinetic compensation effect in the three systems was discovered, implying similarities in their respective reaction mechanisms. Additionally, influence mechanism of K doping on the apparent activation energy and reaction rate was analyzed.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"90 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141921664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SuperSIM: A comprehensive benchmarking framework for neural networks using superconductor josephson devices","authors":"Guangxian Zhu, Yirong Kan, Renyuan Zhang, Yasuhiko Nakashima, Wenhui Luo, N. Takeuchi, Nobuyuki Yoshikawa, O. Chen","doi":"10.1088/1361-6668/ad6d9e","DOIUrl":"https://doi.org/10.1088/1361-6668/ad6d9e","url":null,"abstract":"\u0000 This paper introduces SuperSIM, a benchmarking framework tailored for neural networks using superconducting Josephson devices, specifically focusing on Adiabatic Quantum Flux Parametron (AQFP) based Processing-in-Memory (PIM) architectures. Our framework offers in-depth architecture-level simulations and performance assessments to enhance AQFP PIM chip development. It supports single and multi-bit PIM designs, various AQFP memory cell types, and diverse clocking methods. Additionally, it integrates circuit-level models for precise energy, delay, and area measurements, ensuring accurate performance evaluation. The framework includes application, device, and architectural layers for versatile configurations and cycle-accurate energy, latency, and area simulations. Experiments validate our framework, with case studies on algorithm and architecture-level features, examining data precision, crossbar size, operating frequency and clocking scheme impacts on computational accuracy, energy use, overall latency and hardware cost.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"16 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141925321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance enhancements of HTS power cables by minimizing the electric field enhancements for electric transport applications","authors":"Alexia Mullings, P. Mensah, P. Cheetham, A. K. Das, Nagaraju Guvvala, Chul H. Kim, Sastry D Pamidi","doi":"10.1088/1361-6668/ad6d9a","DOIUrl":"https://doi.org/10.1088/1361-6668/ad6d9a","url":null,"abstract":"\u0000 Design innovations to manage the electric field enhancements and successful use of cryogenic epoxy EP37 as electrical insulation for high temperature superconducting (HTS) cables for electric aircraft applications are reported. Detailed finite element analysis (FEA) of the electric field distribution shows that the highest electric field is at the interface of the ground and electrical insulation layers. The FEA led to the design, fabrication, and experimental characterization of four model cables with stress cones and a direct bond of the ground and insulation layers. Enhanced partial discharge inception voltage (PDIV) was achieved in the model cables by minimizing the electric field enhancements at the ground layer interface. Using a helium gas mixture with 4 mol% H2, with higher intrinsic dielectric strength than pure helium, further enhanced the PDIV. The results warrant further studies on long HTS cables with EP37 as electrical insulation with a direct bond between the insulation and ground layers.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"67 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141922573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}