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Journal Articles

Kinetic inductance neutron detector operated at near critical temperature

Vu, TheDang; Nishimura, Kazuma*; Shishido, Hiroaki*; Harada, Masahide; Oikawa, Kenichi; Miyajima, Shigeyuki*; Hidaka, Mutsuo*; Oku, Takayuki; Soyama, Kazuhiko; Aizawa, Kazuya; et al.

Journal of Physics; Conference Series, 1590, p.012036_1 - 012036_9, 2020/07

Journal Articles

Monte Carlo radiation transport modelling of the current-biased kinetic inductance detector

Malins, A.; Machida, Masahiko; Vu, TheDang; Aizawa, Kazuya; Ishida, Takekazu*

Nuclear Instruments and Methods in Physics Research A, 953, p.163130_1 - 163130_7, 2020/02

 Times Cited Count:2 Percentile:16.78(Instruments & Instrumentation)

Journal Articles

Temperature dependent characteristics of neutron signals from a current-biased Nb nanowire detector with $$^{10}$$B converter

Vu, TheDang; Iizawa, Yuki*; Nishimura, Kazuma*; Shishido, Hiroaki*; Kojima, Kenji*; Oikawa, Kenichi; Harada, Masahide; Miyajima, Shigeyuki*; Hidaka, Mutsuo*; Oku, Takayuki; et al.

Journal of Physics; Conference Series, 1293, p.012051_1 - 012051_9, 2019/10

Journal Articles

Neutron flux spectrum revealed by Nb-based current-biased kinetic inductance detector with a $$^{10}$$B conversion layer

Miyajima, Shigeyuki*; Shishido, Hiroaki*; Narukami, Yoshito*; Yoshioka, Naohito*; Fujimaki, Akira*; Hidaka, Mutsuo*; Oikawa, Kenichi; Harada, Masahide; Oku, Takayuki; Arai, Masatoshi*; et al.

Nuclear Instruments and Methods in Physics Research A, 842, p.71 - 75, 2017/01

 Times Cited Count:8 Percentile:14.05(Instruments & Instrumentation)

Journal Articles

Aalpha-ray detection with a MgB$$_{2}$$ transition edge sensor

Okayasu, Satoru; Katagiri, Masaki; Hojo, Kiichi; Morii, Yukio; Miki, Shigenobu*; Shimakage, Hisashi*; Wang, Z.*; Ishida, Takekazu*

Physica C, 468(15-20), p.1998 - 2000, 2008/09

 Times Cited Count:0 Percentile:100(Physics, Applied)

We have been investigating for neutron detection with the MgB $$_{2}$$ transition edge sensor (TES). For the purpose, we have been developing a low noise measurement system for neutron detection. To confirm the usefulness of our detecting system, alpha-ray detection from an $$^{241}$$Am source was achieved. To improve the sensitivity, short meander samples with 35 $$mu$$m length and 1 $$mu$$m width is used. Samples are fabricated by the Kansai group. Superconducting transition temperature Tc is 23.3 K. The transition width is sharp enough less than 1 K. The detection was achieved under a constant current condition, and the resistivity changes at the sample due to the alpha-ray irradiation were detected. The bias current is 6 $$mu$$A.

Journal Articles

Superconducting MgB$$_2$$ thin film detector for neutrons

Ishida, Takekazu*; Nishikawa, Masatoshi*; Fujita, Yoshifumi*; Okayasu, Satoru; Katagiri, Masaki*; Sato, Kazuo*; Yotsuya, Tsutomu*; Shimakage, Hisashi*; Miki, Shigehito*; Wang, Z.*; et al.

Journal of Low Temperature Physics, 151(3-4), p.1074 - 1079, 2008/05

 Times Cited Count:30 Percentile:22.8(Physics, Applied)

The superconducting neutron detector using high-quality $$^{10}$$B-enriched MgB$$_2$$ thin films at higher operating temperatures has been proposed, where a resistance change induced by the nuclear reaction of neutron and $$^{10}$$B in MgB$$_2$$ is used to detect a neutron. Cold neutrons from a nuclear research reactor irradiated the MgB$$_2$$ detector, and the output voltage was clearly observed through a low-noise amplifier by using a digital oscilloscope. The out-of-equilibrium thermodynamics was investigated by means of the time-dependent Ginzburg-Landau equations by using the Earth Simulator.

Journal Articles

Direct numerical simulations for non-equilibrium superconducting dynamics at the transition edge; Simulation for MgB$$_{2}$$ neutron detectors

Machida, Masahiko; Kano, Takuma*; Koyama, Tomio*; Kato, Masaru*; Ishida, Takekazu*

Journal of Low Temperature Physics, 151(1), p.58 - 63, 2008/04

 Times Cited Count:10 Percentile:53(Physics, Applied)

We perform large-scale numerical simulations on the non-equilibrium superconducting dynamics after a neutron capture at the superconducting transition edge in MgB$$_{2}$$ by solving the time-dependent Ginzburg-Landau equation coupled with the Maxwell and the heat diffusion equations. The simulations are carried out under the current-biased condition in order to explain experimental results made in the JAEA reactor JRR-3, and the time scale of the obtained voltage signal is found tobe almost consistent with the experiments. Moreover, the time evolution of the voltage signal is connected with that of the spatial profile of the superconducting order parameter.

Journal Articles

Novel anisotropic superconductivity in nano-structured superconductors

Kato, Masaru*; Koyama, Tomio*; Machida, Masahiko; Hayashi, Masahiko*; Ebisawa, Hiromichi*; Ishida, Takekazu*

Physica B; Condensed Matter, 403(5-9), p.996 - 998, 2008/04

 Times Cited Count:0 Percentile:100(Physics, Condensed Matter)

Using the Bogoliubov-de Gennes equation of a tight-binding electron model with attractive on-site and nearest-neighbor sites interactions, we investigate the superconducting structure of nano-structured anisotropic superconductors. Numerical results show that nano-scaled $$pi$$/4-rotated square d-wave superconductors show various type of uperconductivities depending on the size. Especially, $$s$$+$$id$$ superconductivity, appears when size of superconductors is 10 times of coherence length.

Journal Articles

Simulation of logic gate using d-dot's

Nakajima, Susumu*; Kato, Masaru*; Koyama, Tomio*; Machida, Masahiko; Ishida, Takekazu*; Nori, F.*

Physica C, 468(7-10), p.769 - 772, 2008/04

 Times Cited Count:4 Percentile:75.83(Physics, Applied)

A d-dot is a superconducting composite structure of d- and s-wave superconductors, which shows spontaneous half-quantized magnetic fluxes. We developed numerical method to analyze the time development of these spontaneous magnetic fluxes, based on the twocomponents Ginzburg-Landau equation. The d-dot can be used as an element of quantum dot cellular automata logic gates. We show a simulation, which demonstrates the transfer of information between two d-dot's.

Journal Articles

Periodic flux jump in superconducting Pb networks as consequence of the extended Little-Parks effect

Ishida, Takekazu*; Matsushima, Yoshiaki*; Shimizu, Makoto*; Hayashi, Masahiko*; Ebisawa, Hiromichi*; Sato, Osamu*; Kato, Masaru*; Koyama, Tomio*; Machida, Masahiko; Sato, Kazuo*; et al.

Physica C, 468(7-10), p.576 - 580, 2008/04

 Times Cited Count:3 Percentile:81.09(Physics, Applied)

The extended Little-Parks effect of superconducting network is known as a periodic $$T$$$$_{rm c}$$ variation as a function of magnetic field. Superconducting Pb honeycomb networks of matching field 0.106 G and triangular microhole lattice of Pb of matching field 0.425 G have been fabricated by the combination of electron-beam lithography and a lift-off process of evaporated Pb films. The application of magnetic field corresponds to the vortex filling into superconducting networks. We measured the magnetization of the networks systematically by using a SQUID magnetometer. We found that flux jump appears rather periodically as a function of magnetic field. Flux jumps may be induced by a periodic decrease of the critical current density of the network. To the authors' knowledge, this is for the first time to observe the regular flux jumps due to the critical current modification coming from the extended Little-Parks effect of the superconducting networks.

Journal Articles

Direct numerical simulation on non-equilibrium superconducting dynamics after neutron capture in MgB$$_{2}$$ superconductor

Machida, Masahiko; Koyama, Tomio*; Kato, Masaru*; Ishida, Takekazu*

Nuclear Instruments and Methods in Physics Research A, 559(2), p.594 - 596, 2006/04

 Times Cited Count:11 Percentile:34.84(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Josephson half-quantized vortices in long square $$pi$$ junctions around d-dot

Machida, Masahiko; Koyama, Tomio*; Kato, Masaru*; Ishida, Takekazu*

Physica C, 426-431(2), p.1566 - 1571, 2005/10

no abstracts in English

Journal Articles

Direct numerical simulations for non-equilibrium superconducting dynamics and related neutron detection in MgB$$_{2}$$

Machida, Masahiko; Koyama, Tomio*; Kato, Masaru*; Ishida, Takekazu*

Physica C, 426-431(1), p.169 - 173, 2005/10

no abstracts in English

Journal Articles

Superconducting electronics applications of metallic high-Tc substance MgB$$_{2}$$; Toward superconducting tunnel junctions and superconducting radiation detectors using thermal relaxation process

Ishida, Takekazu*; Wang, Z.*; Yotsuya, Tsutomu*; Machida, Masahiko

Kotai Butsuri, 40(1), p.51 - 67, 2005/01

no abstracts in English

Journal Articles

Electronic structure of a half vortex

Machida, Masahiko; Koyama, Tomio*; Kato, Masaru*; Ishida, Takekazu*

Physica C, 412-414(Part 1), p.367 - 371, 2004/10

 Times Cited Count:4 Percentile:73.29(Physics, Applied)

no abstracts in English

JAEA Reports

Extended abstracts of the 13th JAERI Workshop on High-Tc Superconductors

Okayasu, Satoru; Hojo, Kiichi; Ishida, Takekazu*

JAERI-Review 2002-018, 118 Pages, 2002/09

JAERI-Review-2002-018.pdf:10.38MB

no abstracts in English

Journal Articles

Direct observation of vortex images on lead micro-hole lattice by SQUID microscope

Ishida, Takekazu*; Yoshida, Masaaki*; Okuda, Kiichi*; Okayasu, Satoru; Sasase, Masato; Hojo, Kiichi; Odawara, Akikazu*; Nagata, Atsushi*; Morooka, Toshimitsu*; Nakayama, Satoshi*; et al.

Physica C, 357-360(Part.1), p.604 - 607, 2001/09

no abstracts in English

Journal Articles

Intrinsic pinning does not influence the vortex melting transition of YBa$$_{2}$$Cu$$_{3}$$O$$_{6.94}$$ in H$$perp$$c configuration

Ishida, Takekazu*; Kitamura, Kentaro*; Okuda, Kiichi*; Asaoka, Hidehito

Journal of the Physical Society of Japan, 70(7), p.2110 - 2113, 2001/07

 Times Cited Count:3 Percentile:71.5(Physics, Multidisciplinary)

no abstracts in English

JAEA Reports

Extended abstracts of the 12th JAERI Workshop on High-Tc Superconductors

Hojo, Kiichi; Okayasu, Satoru; Sasase, Masato; Ishida, Takekazu*

JAERI-Review 2001-008, 150 Pages, 2001/03

JAERI-Review-2001-008.pdf:20.63MB

no abstracts in English

Journal Articles

Nature of vortex melting transition when the field is perpendicular to the c-axis of untwinned YBa$$_{2}$$Cu$$_{3}$$O$$_{6.94}$$

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito

Physica B; Condensed Matter, 284-288(Part1), p.727 - 728, 2000/07

 Times Cited Count:0 Percentile:100

no abstracts in English

36 (Records 1-20 displayed on this page)