G. de Lange, M. D. Audley, W. Vreeling, Froukje Gjaltema, A. Detrain
{"title":"Microwave characterization of ultra-sensitive far-infrared TES detectors for SAFARI","authors":"G. de Lange, M. D. Audley, W. Vreeling, Froukje Gjaltema, A. Detrain","doi":"10.1109/ISEC.2013.6604288","DOIUrl":"https://doi.org/10.1109/ISEC.2013.6604288","url":null,"abstract":"We have characterized the dynamic behavior of ultra-sensitive far-infrared Transition Edge Sensors with amplitude modulated microwave signals at a few GHz. We describe the set-up and initial results.","PeriodicalId":233581,"journal":{"name":"2013 IEEE 14th International Superconductive Electronics Conference (ISEC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121924378","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":"Modeling and calibration of ADP process for inductance calculation with InductEx","authors":"C. Fourie, X. Peng, A. Takahashi, N. Yoshikawa","doi":"10.1109/ISEC.2013.6604270","DOIUrl":"https://doi.org/10.1109/ISEC.2013.6604270","url":null,"abstract":"The AIST advanced process (ADP2), with 9 Nb layers and 1 μm minimum Josephson junction size is currently the most complex low-Tc superconductive integrated circuit fabrication process in operation. With planarization for all layers below the main ground plane, and conductors that may traverse several layers, modeling inductance for numerical calculation requires special attention to the capabilities of the extraction tool. We present specific improvements made to InductEx to model the ADP process, including support for selective layer planarization, multiple ground planes and conductors below a ground plane. We discuss calibration of extracted values to experimental results, and show results for pulse transfer cells with inductive coupling and isolated ground planes.","PeriodicalId":233581,"journal":{"name":"2013 IEEE 14th International Superconductive Electronics Conference (ISEC)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130567792","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}
K. Sano, A. Takahashi, Y. Yamanashi, N. Yoshikawa, N. Zen, K. Suzuki, M. Ohkubo
{"title":"Design and high-speed tests of a single-flux-quantum time-to-digital converter for time-of-flight mass spectrometry","authors":"K. Sano, A. Takahashi, Y. Yamanashi, N. Yoshikawa, N. Zen, K. Suzuki, M. Ohkubo","doi":"10.1109/ISEC.2013.6604259","DOIUrl":"https://doi.org/10.1109/ISEC.2013.6604259","url":null,"abstract":"We are developing a single-flux-quantum (SFQ) time-to-digital converter (TDC) for time-of-flight mass spectrometry (TOF MS) system. In this study, we designed and tested a 24-bit SFQ TDC with a 3 × 24-bit FIFO buffer using the AIST Nb standard process (STP2), whose time resolution and dynamic range are 100 ps and 1.6 ms, respectively. The TDC design was improved to reduce the total junction numbers and the bias current in order to install it in a 4.2 K cryo-cooler. We confirmed the operation of the TDC and evaluated the jitter by measuring a histogram of TDC read out.","PeriodicalId":233581,"journal":{"name":"2013 IEEE 14th International Superconductive Electronics Conference (ISEC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132373980","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":"Magnetic field calculations in the vicinity of superconductive circuit structures","authors":"C. Fourie, S. Anton, J. Clarke","doi":"10.1109/ISEC.2013.6604305","DOIUrl":"https://doi.org/10.1109/ISEC.2013.6604305","url":null,"abstract":"Modeling the magnetic field generated by currents in thin-film superconducting structures is useful to a broad range of applications. Present methods calculate the magnetic field around such structures from two-dimensional current sheets. We present an efficient and accurate algorithm to calculate the magnetic field at arbitrary locations in three dimensions, both internal and external to the structures. We use a combination of FastHenry and InductEx to calculate the current density, from which we compute the magnetic field semi-analytically using Biot-Savart's law. As practical examples, we employ the algorithm to compute (i) the mean square flux noise in square SQUID and qubit loops and (ii) the dc bias current-induced magnetic field in real digital circuit layouts.","PeriodicalId":233581,"journal":{"name":"2013 IEEE 14th International Superconductive Electronics Conference (ISEC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121714371","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}
R. Takagi, M. M. Saari, K. Sakai, T. Kiwa, K. Tsukada
{"title":"Development of a compact magnetometer with an AC/DC magnetic field using HTS-SQUID","authors":"R. Takagi, M. M. Saari, K. Sakai, T. Kiwa, K. Tsukada","doi":"10.1109/ISEC.2013.6604309","DOIUrl":"https://doi.org/10.1109/ISEC.2013.6604309","url":null,"abstract":"Measuring the magnetic susceptibility of a material enable us to specify composition of the material. We have reported on development of a compact moving-sample magnetometer using high-temperature superconducting quantum interference device (HTS-SQUID). However, this magnetometer needs long time when we have to measure many samples. In order to solve this problem, we developed a compact magnetometer to analyze quantitative magnetic characteristics by our rapid measurement system using AC/DC functions. The optimal mounting position of pickup coils for the AC magnetic field measurement was optimized. The performance of the AC magnetic field measurement system was evaluated by measuring harmonic components of the AC magnetic response from a dispersion of iron oxide in styrene resin, when AC/DC magnetic field is applied. Using this system, the sample composition of ferromagnetic and diamagnetic substances can be evaluated from the mixed sample by measuring the harmonic components of the magnetic responses.","PeriodicalId":233581,"journal":{"name":"2013 IEEE 14th International Superconductive Electronics Conference (ISEC)","volume":"332 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115976361","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}
R. Epstein, M. Sheik-Bahae, S. Melgaard, D. Seletskiy, A. Albrecht, M. Ghasemkhani
{"title":"Optical cryocoolers","authors":"R. Epstein, M. Sheik-Bahae, S. Melgaard, D. Seletskiy, A. Albrecht, M. Ghasemkhani","doi":"10.1109/isec.2013.6604266","DOIUrl":"https://doi.org/10.1109/isec.2013.6604266","url":null,"abstract":"Optical refrigeration is a solid-state cooling technology that has already achieved working temperatures of 114 K and is expected to cool below 80 K in the near future. This approach to cooling generates no vibrations and is immune to magnetic or electromagnetic interference. Furthermore, the coolers can be much lighter and more compact than mechanical coolers. At the minimum temperatures, the heat lift is about 1% of the input power.","PeriodicalId":233581,"journal":{"name":"2013 IEEE 14th International Superconductive Electronics Conference (ISEC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127644014","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}