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Your search keyword '"Ohkubo M"' showing total 322 results
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322 results on '"Ohkubo M"'

27. Development of superconducting strip line detectors (SSLDs) for time-of-flight mass spectrometers (TOF-MS)

Author

Zen, N., Yigang Chen, Suzuki, K., Ohkubo, M., Miki, S., and Zhen Wang

Subjects
Barium compounds -- Electric properties, Biosensors -- Evaluation, Mass spectrometry -- Design and construction, Niobium -- Electric properties, Superconductive devices -- Design and construction, Yttrium -- Electric properties, Business, Electronics, Electronics and electrical industries
Published
2009

33. Titanium based transition edge microcalorimeters for optical photon measurements

Author

Fukuda, D., Damayanthi, R.M.T., Yoshizawa, A., Zen, N., Takahashi, H., Amemiya, K., and Ohkubo, M.

Subjects
Ablation (Vaporization technology) -- Analysis, Integrated circuit fabrication -- Analysis, Photon detectors -- Usage, Integrated circuit fabrication, Business, Electronics, Electronics and electrical industries
Abstract

A new transition edge sensor with the titanium superconductor fabricated for single photon measurements which showed a fast response to pulsed laser illumination of 1.5 [mu]m wavelength with the fall time constant of 300 ns is reported.

Published
2007

36. Digital signal processing based on a clustering algorithm for Ir/Au TES microcalorimeter

Author

Zen, N., Kunieda, Y., Takahashi, H., Hiramoto, K., Nakazawa, M., Fukuda, D., Ukibe, M., and Ohkubo, M.

Subjects
X-ray astronomy -- Research, X-ray spectroscopy -- Methods, Calorimeters -- Product development, Business, Electronics, Electronics and electrical industries
Abstract

In recent years, cryogenic microcalorimeters using their superconducting transition edge have been under development for possible application to the research for astronomical X-ray observations. To improve the energy resolution of superconducting transition edge sensors (TES), several correction methods have been developed. Among them, a clustering method based on digital signal processing has recently been proposed. In this paper, we applied the clustering method to Ir/Au bilayer TES. This method resulted in almost a 10% improvement in the energy resolution. Conversely, from the point of view of imaging X-ray spectroscopy, we applied the clustering method to pixellated Ir/Au-TES devices. We will thus show how a clustering method which sorts signals by their shapes is also useful for position identification.

Published
2006

37. Effects of spatial nonuniformity of superconducting-tunnel-junction ion detectors on mass spectroscopy

Author

Ohkubo, M., Ukibe, M., Saito, N., Ichimura, S., Kushino, A., and Friedrich, S.

Subjects
Superconductive devices -- Design and construction, Time-of-flight mass spectrometry -- Usage, Radiation warning systems -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

The performance of the superconducting-tunnel-junction (STJ) detectors for time-of-flight mass spectroscopy (TOF-MS) is examined by using the Ta cluster ion source, which produces the peaks with a mass interval of 180.95 Da in the mass spectra. Two kinds of single-element STJ detectors with different spatial profiles are compared in TOF-MS experiments with a Ta cluster ion source.

Published
2005

38. Imaging analysis of superconducting transition edge sensors for calorimeters

Author

Ohkubo, M., Pressler, H., Fukuda, D., Inou, T., Takahashi, H., and Nakazawa, M.

Subjects
Calorimeters -- Research, Superconductive devices -- Research, Image processing -- Research, Radiation warning systems -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Research involving superconducting-transition-edge temperature sensors (TES) for calorimeters is described and discussed.

Published
2003

48. Fabrication and characterization of superconducting x-ray calorimeters with transition edge sensors

Author

Morooka, T., Tanaka, K., Nakayama, S., Nagata, A., Chinone, K., Ukibe, M., Hirayama, Ohkubo, M., Koyanagi, M., Mizuki, T., Hikosaka, T., Kawabe, U., and Nemoto, T.

Subjects
Calorimeters -- Design and construction, Superconductors -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

Superconducting calorimeters have been developed using transition edge sensors for use in industrial x-ray microanalysis.

Published
2001

49. Double peak phenomenon in superconducting tunnel junction x-ray detectors

Author

Ohkubo, M., Fukuda, D., Sakamoto, I., Hayashi, N., Panteleit, F., Martin, J., and Huebener, R.P.

Subjects
Semiconductors -- Junctions, Tunneling (Physics) -- Research, Electrodes -- Research, Etching -- Research, Physics
Abstract

A study was conducted to analyze double peak phenomenon in superconducting tunnel junction x-ray detectors. Square junctions were fabricated by the dc-sputtering of aluminum surface by photolithographic patterning using reactive ion etching. Results indicated that the double peak correlated with the dynamics of quasiparticles resulting from x-ray absorption events. In addition, the double peak phenomenon was influenced by by bias voltage and magnetic history.

Published
1999

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