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2015 15th International Superconductive Electronics Conference (ISEC)最新文献

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Shapiro Steps under Resonance Irradiation 共振辐射下的夏皮罗步骤
2015 15th International Superconductive Electronics Conference (ISEC) Pub Date : 2015-07-06 DOI: 10.1109/ISEC.2015.7383480
V. Kornev, N. Kolotinskiy, A. Levochkina
{"title":"Shapiro Steps under Resonance Irradiation","authors":"V. Kornev, N. Kolotinskiy, A. Levochkina","doi":"10.1109/ISEC.2015.7383480","DOIUrl":"https://doi.org/10.1109/ISEC.2015.7383480","url":null,"abstract":"We consider Josephson junction coupled to a high- quality parallel resonance circuit under microwave irradiation on the resonance frequency. The phase- locking of Josephson oscillations manifesting itself through Shapiro steps is studied using analytic theory developed for the circuit. Substantial change in amplitude of the oscillating part of Josephson phase within the phase-locking range determines specificity of the step behavior. This analysis is compared with results of numerical simulation.","PeriodicalId":119187,"journal":{"name":"2015 15th International Superconductive Electronics Conference (ISEC)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125267334","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}
引用次数: 0
Investigation of Current Gain in Superconducting-Ferromagnetic Transistors 超导-铁磁晶体管电流增益的研究
2015 15th International Superconductive Electronics Conference (ISEC) Pub Date : 2015-07-06 DOI: 10.1109/ISEC.2015.7383465
I. Nevirkovets, G. Prokopenko, O. Mukhanov, O. Chernyashevskyy, J. Ketterson
{"title":"Investigation of Current Gain in Superconducting-Ferromagnetic Transistors","authors":"I. Nevirkovets, G. Prokopenko, O. Mukhanov, O. Chernyashevskyy, J. Ketterson","doi":"10.1109/ISEC.2015.7383465","DOIUrl":"https://doi.org/10.1109/ISEC.2015.7383465","url":null,"abstract":"The superconductor-ferromagnetic transistors (SFTs) with the SISFIFS structure (where S, I, and F denote a superconductor (Nb), an insulator (AlOx), and a ferromagnetic material (Ni), respectively) are promising for various applications in superconducting electronics. Specifically, as current amplifiers, they can be used as line drivers and cell selectors in cryogenic memory. Here we report on results of a study of dependence of current gain on the SFIFS injector and SIS acceptor barrier transparency. We demonstrate that making the acceptor junction much more transparent than the injector junction results in improvement of the current gain; in particular it can exceed unity. Therefore proper device engineering allows one to efficiently control the maximum Josephson current in the SIS acceptor junction using the quasiparticle injection.","PeriodicalId":119187,"journal":{"name":"2015 15th International Superconductive Electronics Conference (ISEC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130592391","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}
引用次数: 3
Elimination of 1/ƒ Noise in Gradiometers for SQUID-Based Ultra-Low Field Nuclear Magnetic Resonance 基于squid的超低场核磁共振梯度计中1/ f噪声的消除
2015 15th International Superconductive Electronics Conference (ISEC) Pub Date : 2015-07-06 DOI: 10.1109/ISEC.2015.7383455
A. Matlashov, P. Magnelind, P. Volegov, M. Espy
{"title":"Elimination of 1/ƒ Noise in Gradiometers for SQUID-Based Ultra-Low Field Nuclear Magnetic Resonance","authors":"A. Matlashov, P. Magnelind, P. Volegov, M. Espy","doi":"10.1109/ISEC.2015.7383455","DOIUrl":"https://doi.org/10.1109/ISEC.2015.7383455","url":null,"abstract":"Superconducting wire may trap magnetic flux after being exposed to strong magnetic fields, for example when used as gradiometer material in a SQUID-based ultra-low field nuclear magnetic resonance system. In this work we investigated noise caused by the dynamics of trapped flux in superconducting gradiometers made from different materials. Niobium (Nb), niobium-titanium (NbTi), and tantalum (Ta) wires were tested. Small wire-wound gradiometers were connected to a SQUID sensor. Nb and NbTi wires showed increasing 1/f noise after exposure to magnetic fields of 5 mT and above. A larger second-order gradiometer made of Ta wire was tested inside a magnetically shielded room. A heating wire was placed on the outside of the Ta wire. Thermo-cycling of the Ta gradiometer significantly decreased the 1/f noise caused by its exposure to a magnetic field.","PeriodicalId":119187,"journal":{"name":"2015 15th International Superconductive Electronics Conference (ISEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124241368","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}
引用次数: 1
Defects of Nb/AlOx/Nb Josephson Junctions Caused by Underneath Fine Particles 细颗粒下致Nb/AlOx/Nb Josephson结缺陷
2015 15th International Superconductive Electronics Conference (ISEC) Pub Date : 2015-07-06 DOI: 10.1109/ISEC.2015.7383437
M. Hidaka, S. Nagasawa, T. Satoh, K. Hinode
{"title":"Defects of Nb/AlOx/Nb Josephson Junctions Caused by Underneath Fine Particles","authors":"M. Hidaka, S. Nagasawa, T. Satoh, K. Hinode","doi":"10.1109/ISEC.2015.7383437","DOIUrl":"https://doi.org/10.1109/ISEC.2015.7383437","url":null,"abstract":"Almost all defects in Nb/AlOx/Nb Josephson junctions (JJs) give rise to JJs with irregularly large critical current (Ic) compared with normal Ic distribution. We experimentally demonstrated the cause of the leakage JJs is fine particles underneath Nb/AlOx/Nb tri-layer. Since their size and density are too small and low to observe using ordinary methods such as microscopes, we think the particles are a previously unknown origin of JJ defects. The particles are included both superconductor and dielectric films. They are generated during their depositions. We expected that scales of superconducting integrated circuits can be improved to a few hundred thousand or a few million JJs by reducing the particles.","PeriodicalId":119187,"journal":{"name":"2015 15th International Superconductive Electronics Conference (ISEC)","volume":"33 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120920418","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}
引用次数: 4
Measurement of Iron-Plate Thickness Using HTS Coil 用高温超导线圈测量铁板厚度
2015 15th International Superconductive Electronics Conference (ISEC) Pub Date : 2015-07-06 DOI: 10.1109/ISEC.2015.7383469
Tomoki Ishida, T. Sasayama, M. Matsuo, K. Enpuku
{"title":"Measurement of Iron-Plate Thickness Using HTS Coil","authors":"Tomoki Ishida, T. Sasayama, M. Matsuo, K. Enpuku","doi":"10.1109/ISEC.2015.7383469","DOIUrl":"https://doi.org/10.1109/ISEC.2015.7383469","url":null,"abstract":"Eddy current testing (ECT) has been widely used for the nondestructive evaluation of metallic plates or pipes. One of the methods in ECT is to measure the change of coil impedance that is caused by the metallic plate below the coil. We applied this method to estimate the thickness of an iron plate. In this case, low-frequency measurement is required in order to avoid the skin effect. At low frequencies, however, coil resistance dominates the coil impedance, and it becomes difficult to measure small changes in coil impedance. Therefore, we applied a high-temperature superconducting (HTS) coil in order to realize low coil resistance. In the experiment, changes in inductance L and resistance R of the coil were measured when the iron plate was set at 20 mm below the HTS coil. The range of the measurement frequency was chosen from 2 to 15 Hz, and the thickness of the plate was changed from 6 to 22 mm. It was shown that changes in R were clearly related to the thickness of the iron plate. Therefore, we could determine the thickness of the iron plate. Numerical simulation using the finite element method was also performed to analyze the experimental results.","PeriodicalId":119187,"journal":{"name":"2015 15th International Superconductive Electronics Conference (ISEC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114338758","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}
引用次数: 1
Current-Biased Kinetic Inductance Detector for Neutrons 中子电流偏置动态电感检测器
2015 15th International Superconductive Electronics Conference (ISEC) Pub Date : 2015-07-06 DOI: 10.1109/ISEC.2015.7383436
H. Shishido, S. Miyajima, Hiroyuki Yamaguchi, H. Nakayama, Y. Narukami, A. Fujimaki, M. Hidaka, K. Oikawa, M. Harada, T. Oku, M. Arai, T. Ishida
{"title":"Current-Biased Kinetic Inductance Detector for Neutrons","authors":"H. Shishido, S. Miyajima, Hiroyuki Yamaguchi, H. Nakayama, Y. Narukami, A. Fujimaki, M. Hidaka, K. Oikawa, M. Harada, T. Oku, M. Arai, T. Ishida","doi":"10.1109/ISEC.2015.7383436","DOIUrl":"https://doi.org/10.1109/ISEC.2015.7383436","url":null,"abstract":"We succeeded in measuring a clear signal from a single neutron by using a solid state superconducting current biased kinetic inductance detector, which consists of a superconducting Nb meanderline and an enriched 10B neutron conversion layer. Our neutron detector is able to operate at temperatures much lower than Tc. A full width at half maximum of signal remains at a few tens ns, ensuring fast operation as a neutron detector. A time-dependent histogram for the pulsed neutron intensity is in good agreement with the prediction from a Monte-Carlo simulation. We convincingly conclude that our detector was successful in detecting pulsed neutrons produced from the beam line BL10 at J-PARC.","PeriodicalId":119187,"journal":{"name":"2015 15th International Superconductive Electronics Conference (ISEC)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131642190","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}
引用次数: 2
Design and Operation of ROM-Dedicated Single-Flux-Quantum Cell Comprising Splitters and Confluence Buffers 包含分裂器和汇流缓冲器的rom专用单通量量子单元的设计与运行
2015 15th International Superconductive Electronics Conference (ISEC) Pub Date : 2015-07-06 DOI: 10.1109/ISEC.2015.7383443
K. Sawada, Tomoki Watanabe, H. Shimada, Y. Mizugaki
{"title":"Design and Operation of ROM-Dedicated Single-Flux-Quantum Cell Comprising Splitters and Confluence Buffers","authors":"K. Sawada, Tomoki Watanabe, H. Shimada, Y. Mizugaki","doi":"10.1109/ISEC.2015.7383443","DOIUrl":"https://doi.org/10.1109/ISEC.2015.7383443","url":null,"abstract":"We have developed a single-flux-quantum (SFQ) read only memory (ROM) cell. The developed SFQ ROM cell has compatibility with an existing cell library. It comprises splitters and confluence buffers. For large integration, we have merged two 1-bit cells into one cell with peripheral elements, and we have optimized circuit parameters with an automatic optimization tool. The cell area is approximately 50% of our preliminary SFQ sequential ROM cell using the CONNECT cell library. A test circuit was fabricated using a 25 μA/ μm2 Nb integration process. We have confirmed correct operation for all six I/O ports. The measured bias margins were almost the same magnitude as the simulation result.","PeriodicalId":119187,"journal":{"name":"2015 15th International Superconductive Electronics Conference (ISEC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123175082","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}
引用次数: 1
Vortex Transitional Memory Developed with Nb 4-Layer, 10-kA/cm² Fabrication Process 采用Nb - 4层、10-kA/cm²制造工艺开发涡流过渡存储器
2015 15th International Superconductive Electronics Conference (ISEC) Pub Date : 2015-07-06 DOI: 10.1109/ISEC.2015.7383489
Yuto Komura, Masamitsu Tanaka, S. Nagasawa, A. Bozbey
{"title":"Vortex Transitional Memory Developed with Nb 4-Layer, 10-kA/cm² Fabrication Process","authors":"Yuto Komura, Masamitsu Tanaka, S. Nagasawa, A. Bozbey","doi":"10.1109/ISEC.2015.7383489","DOIUrl":"https://doi.org/10.1109/ISEC.2015.7383489","url":null,"abstract":"We report random access memories (RAMs) based on vortex transitional (VT) memory cell developed with the newly developed AIST 10-kA/cm2, Nb 4-layer fabrication process, called High-Speed Standard Process (HSTP). We obtained more effective mutual coupling structure by fully use of all the wiring layer, and successfully reduced the cell size to 25 μm square, which indicated roughly 50% increase in density compared to the previous design. We reduced the critical currents of Josephson junctions and load resistance to be matched with driving circuitry. We tested the miniaturized VT memory cell, and obtained a sufficient margin width of ~15%, and also confirmed correct operations of the other components, including a latching driver and address decoder.","PeriodicalId":119187,"journal":{"name":"2015 15th International Superconductive Electronics Conference (ISEC)","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122604609","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}
引用次数: 2
Implementation of a New Relaxation Oscillator Using Superconducting Schmitt Trigger Inverter 利用超导施密特触发逆变器实现一种新型弛豫振荡器
2015 15th International Superconductive Electronics Conference (ISEC) Pub Date : 2015-07-06 DOI: 10.1109/ISEC.2015.7383462
T. Onomi
{"title":"Implementation of a New Relaxation Oscillator Using Superconducting Schmitt Trigger Inverter","authors":"T. Onomi","doi":"10.1109/ISEC.2015.7383462","DOIUrl":"https://doi.org/10.1109/ISEC.2015.7383462","url":null,"abstract":"A new relaxation oscillator using a superconducting Schmitt trigger inverter is proposed and tested. The superconducting Schmitt trigger inverter is composed of a threshold gate using coupled superconducting interference devices (SQUIDs). The oscillator is based on the general concept using the Schmitt trigger inverter and a delayed feedback loop. The designed relaxation oscillator is fabricated by a 2.5kA/cm2 Nb/AlOx/Nb process and tested. The operation of a fabricated relaxation oscillator is experimentally demonstrated.","PeriodicalId":119187,"journal":{"name":"2015 15th International Superconductive Electronics Conference (ISEC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127655207","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}
引用次数: 0
Fast Multicore FastHenry and a Tetrahedral Modeling Method for Inductance Extraction of Complex 3D Geometries 复杂三维几何电感提取的快速多芯法及四面体建模方法
2015 15th International Superconductive Electronics Conference (ISEC) Pub Date : 2015-07-06 DOI: 10.1109/ISEC.2015.7383459
Kyle Jackman, C. Fourie
{"title":"Fast Multicore FastHenry and a Tetrahedral Modeling Method for Inductance Extraction of Complex 3D Geometries","authors":"Kyle Jackman, C. Fourie","doi":"10.1109/ISEC.2015.7383459","DOIUrl":"https://doi.org/10.1109/ISEC.2015.7383459","url":null,"abstract":"FastHenry is a powerful numerical engine with which to calculate inductance in superconducting structures, but modern high-end multilayer fabrication processes result in dense calculation problems for which it was not optimized. We identify these shortcomings for typical calculation problems and present algorithmic improvements and multicore parallelization to increase computational efficiency. We attain performance increases of one to two orders of magnitude for models of real circuit layouts. We also show that these multicore methods deliver similar performance increases when applied to an engine that uses tetrahedral elements.","PeriodicalId":119187,"journal":{"name":"2015 15th International Superconductive Electronics Conference (ISEC)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132567843","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}
引用次数: 12
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