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10. HTS sampler with optical signal input

Author

Maruyama, Michitaka, Uekusa, Koichiro, Konno, Takeshi, Sato, Nobuya, Kawabata, Masayuki, Hato, Tsunehiro, Suzuki, Hideo, and Tanabe, Keiichi

Subjects
High temperature superconductors -- Electric properties, Superconductive devices -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

The results of waveform observations using the high-[T.sub.c] superconducting (HTS) sampler circuits with the commercial uni-travelling-carrier photodiode (UTC-PD) module and a custom-made integrated module is presented.

Published
2007

11. Output interface with latching driver for LTS-SFQ circuits

Author

Hato, Tsunehiro, Horibe, Masahiro, Wakana, Hironori, Hidaka, Mutsuo, and Tanabe, Keiichi

Subjects
Materials at low temperatures -- Electric properties, Superconductive devices -- Design and construction, Interface circuits -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

An output interface with a latching driver for single-flux-quantum (SFQ) circuits operating at 4.2 K is proposed. An optimum critical current density J(sub c) of the latching driver is discussed, and a multichip module (MCM) structure with SFQ circuits and latching drivers is proposed for 40-Gb/s operation.

Published
2005

12. SFQ-to-level logic conversion by HTS Josephson drivers for output interface

Author

Hato, Tsunehiro, Ishimaru, Yoshihiro, Harada, Naoki, Horibe, Masahiro, Yoshida, Akira, Tarutani, Yoshinobu, Tanabe, Keiichi, and Yokoyama, Naoki

Subjects
Digital integrated circuits -- Research, Superconductive devices -- Research, Josephson junction -- Research, Digital integrated circuits -- 2002 AD, Josephson junction -- 2002 AD, Superconductive devices -- 2002 AD, Business, Electronics, Electronics and electrical industries
Abstract

A dc/SFQ converter, Josephson transmission lines (JTL) and a latching driver, formed using HTS junctions, are described and discussed.

Published
2003

13. A latching-type driver circuit using capacitively-shunted HTS ramp-edge-type junctions

Author

Hato, Tsunehiro, Harada, Naoki, Ishimaru, Yoshihiro, Yoshida, Akira, and Yokoyama, Naoki

Subjects
Superconductive devices -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

A latching-type driver was developed using capacitively shunted high temperature superconductivity junctions.

Published
2001

18. HTS-SQUID vector magnetometer with low crosstalk configuration

Author

Tsukamoto, Akira, primary, Hato, Tsunehiro, additional, Adachi, Seiji, additional, Oshikubo, Yasuo, additional, Tanabe, Keiichi, additional, Motoori, Masayuki, additional, Ueda, Satoshi, additional, Watanabe, Hidehisa, additional, Ishikawa, Hidehiro, additional, Okada, Chikara, additional, and Yamazaki, Tomohiro, additional

Published
2019
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27. Highly Sensitive Third-Harmonic Detection Method of Magnetic Nanoparticles Using an AC Susceptibility Measurement System for Liquid-Phase Assay

Author

Mizoguchi, Takako, primary, Kandori, Akihiko, additional, Kawabata, Ryuzo, additional, Ogata, Kuniomi, additional, Hato, Tsunehiro, additional, Tsukamoto, Akira, additional, Adachi, Seiji, additional, Tanabe, Keiichi, additional, Tanaka, Saburo, additional, Tsukada, Keiji, additional, and Enpuku, Keiji, additional

Published
2016
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43. Fabrication of Integrated Two-Axis High-Tc Planar Gradiometer.

Author

Tsukamoto, Akira, Adachi, Seiji, Oshikubo, Yasuo, Kawano, Joji, Hato, Tsunehiro, and Tanabe, Keiichi

Subjects
MICROFABRICATION, SUPERCONDUCTING quantum interference devices, SUPERCONDUCTING magnets, HIGH temperature superconductors, MAGNETIC shielding, ELECTRIC noise, ELECTRIC coils, MAGNETIC flux
Abstract

We have fabricated a two-axis high-Tc planar gradiometer. Two gradiometers with planar gradiometric pickup coils lie diagonally on a square substrate. Therefore, they can measure field gradients, dBz/dx and dBz/dy at the same site. The two-axis gradiometer was fabricated on a 15 \times 15 mm MgO (100) substrate using an HTS multilayer process including crossovers, superconductive contacts and ramp-edge junctions. The width of the pickup coil and the baseline length are 6 mm and 8.5 mm, respectively. Voltage modulations in V-\Phi characteristics more than 20 \muV at 77 K were obtained for both the gradiometers. Parasitic effective areas measured by applying a uniform magnetic field were about 0.0001 mm^2. The gradiometer balance was estimated to be about 10^-2. The parasitic effective area was not due to the imbalance of the gradiometric pickup coil, but due to a sensitivity of SQUID itself. Flux noise level as low as 10 \mu\Phi0/Hz^{1/2} at frequencies down to 3 Hz and a cross-talk ratio less than 1/230 were obtained. [ABSTRACT FROM AUTHOR]

Published
2011
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45. Non-Destructive Testing of YBCO Coated-Conductor by Multi-Channel HTS SQUID Gradiometers.

Author

Hato, Tsunehiro, Adachi, Seiji, Wakana, Hironori, Hata, Kiyoshi, Tarutani, Yoshinobu, Machi, Takato, and Tanabe, Keiichi

Subjects
*HIGH temperature superconductors, *NONDESTRUCTIVE testing, *SUPERCONDUCTING quantum interference devices, *RARE earth metals, *MAGNETIC fields, *EDDY currents (Electric)
Abstract

We developed a non-destructive testing (NOT) system utilizing multi-channel high-temperature superconductor (HTS) SQUID gradiometers in order to examine rare earth (RE)-123 coated conductors striated into multi-filamentary lines. The 5-channel HTS SQUID gradiometer array was composed of ramp-edge junctions with LaErBaCuO and SmBaCuO electrode layers, and fabricated by using an HTS multilayer fabrication technique. The parallel gradiometers detected the vertical element of magnetic field gradient induced around defects by an eddy current. It was demonstrated that we can detect macroscopic defects in each filamentary superconducting line at high speed up to 30 m/h. [ABSTRACT FROM AUTHOR]

Published
2009
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46. Development of Integrated HTS SQUIDs With a Multilayer Structure and Ramp-Edge Josephson Junctions.

Author

Wakana, Hironori, Adachi, S., Hata, Kiyoshi, Hato, Tsunehiro, Tarutani, Yoshinobu, and Tanabe, Keiichi

Subjects
HIGH temperature superconductors, SUPERCONDUCTING quantum interference devices, JOSEPHSON junctions, ELECTRODES, ELECTRONIC modulation, ELECTRIC noise, MAGNETOMETERS, MAGNETIC flux
Abstract

We have fabricated high-temperature superconductor (HTS) dc superconducting quantum interference devices (SQUIDs) with a multilayer structure and ramp-edge Josephson junctions. For stable operation at 77 K, SmBa2 Cu3 Oy (SmBCO) and La0.1 - Er0.95Ba1.95Cu3Oy (La-ErBCO) films with a Tc above 90 K were employed as materials for the base-electrode and counter-electrode layers, respectively. Junctions were fabricated by employing a Cu-poor La-ErBCO layer as a precursor of the barrier. The fabricated parallel gradiometers with a baseline of 1-3 mm exhibited the field-induced modulation voltage of 20-50 μV at 77 K, and a clear modulation up to 86.8 K. Noise measurements at 77 K revealed a white flux noise of 4.5-10 μΦ0/Hz1/2 at 1 kHz. The magnetometer with an integrated 20-turn flux transformer and the effective area of about 1.8 mm2 exhibited a field noise of 25 fT/Hz1/2 or less at 1 kHz. [ABSTRACT FROM AUTHOR]

Published
2009
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47. Effect of Thermal Noise and Trigger Jitter on the Operation of HTS Sampler.

Author

Manuyama, Michitaka, Suzuki, Hideo, Hato, Tsunehiro, Yoshida, Akira, and Tanabe, Keiichi

Subjects
SUPERCONDUCTORS, BANDWIDTHS, TRIGGER circuits, NOISE, COMPUTER simulation, SUPERCONDUCTIVITY
Abstract

We have studied the effect of thermal noise and trigger jitter on the bandwidth of a high-Tc superconducting sampler by computer simulation and analytical calculation. Simulation results showed that the minimum IcRn product of the junctions required to obtain 100-GHz bandwidth is raised from 0.63 to 0.75 mV under the influence of the thermal noise at 40 K. On the other hand, the maximum trigger jitter for 100-GHz bandwidth is 1.87 ps when only an averaging effect is assumed. Considering both the effects of thermal noise and trigger jitter, we found, for example, that trigger jitter must be reduced down to 1 ps to realize the bandwidth above 100 GHz with an IcRn product of 1 mV at an operating temperature of 40 K. [ABSTRACT FROM AUTHOR]

Published
2006
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48. High-Yield Fabrication Method for High-Tc Superconducting Quantum Interference Device Magnetometer with Integrated Multiturn Input Coil.

Author

Tsukamoto, Akira, Adachi, Seiji, Oshikubo, Yasuo, Hato, Tsunehiro, and Tanabe, Keiichi

Abstract

We have developed a new fabrication method for a high-Tc superconducting quantum interference device (SQUID) with an integrated multiturn input coil to improve the fabrication yield. The method consists of a new multi-SQUID layout and an additional patterning process. In this layout, each input coil is shunted by a shunt inductor to avoid an increase in the inductance of the flux transformer. After preliminary evaluation, the shunt inductor connected to the preferred SQUID is cut to activate the input coil. We demonstrated a drastic improvement in fabrication yield to obtain white field noise less than 25 fT/Hz1/2 from 25 to 83%. [ABSTRACT FROM AUTHOR]

Published
2012
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49. High-Yield Fabrication Method for High-TcSuperconducting Quantum Interference Device Magnetometer with Integrated Multiturn Input Coil

Author

Tsukamoto, Akira, Adachi, Seiji, Oshikubo, Yasuo, Hato, Tsunehiro, and Tanabe, Keiichi

Abstract

We have developed a new fabrication method for a high-Tcsuperconducting quantum interference device (SQUID) with an integrated multiturn input coil to improve the fabrication yield. The method consists of a new multi-SQUID layout and an additional patterning process. In this layout, each input coil is shunted by a shunt inductor to avoid an increase in the inductance of the flux transformer. After preliminary evaluation, the shunt inductor connected to the preferred SQUID is cut to activate the input coil. We demonstrated a drastic improvement in fabrication yield to obtain white field noise less than 25 fT/Hz1/2from 25 to 83%.

Published
2012
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50. Improved Emitter-Base Junction with In2O3in Dielectric-Base Transistor

Author

Hato, Tsunehiro, Takauchi, Hideki, Yoshida, Akira, Tamura, Hirotaka, Fujimaki, Norio, Oshima, Yoshifumi, and Naoki Yokoyama, Naoki Yokoyama

Abstract

We studied In2O3for use as an intermediate layer between the YBCO emitter electrode and the SrTiO3base region of dielectric-base transistors (DBT). We fabricated and tested a YBCO(001)/In2O3(100)/SrTiO3(110) hetero-structure by using a laser-ablation deposition technique with high-density targets. Our YBCO/In2O3/n-SrTiO3diode structure showed a current density that was one order of magnitude larger than with an MgO intermediate layer.

Published
1995
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