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Your search keyword '"Nagashima, Y."' showing total 19 results
Start Over Author "Nagashima, Y." Journal review of scientific instruments
19 results on '"Nagashima, Y."'

2. Conceptual design of heavy ion beam probes on the PLATO tokamak

Author

Ido, T., primary, Fujisawa, A., additional, Takemura, K., additional, Kobayashi, T.-K., additional, Nishimura, D., additional, Kasuya, N., additional, Fukuyama, A., additional, Moon, C., additional, Yamasaki, K., additional, Inagaki, S., additional, Nagashima, Y., additional, and Yamada, T., additional

Published
2021
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6. Measurement of thickness of film deposited on the plasma-facing wall in the QUEST tokamak by colorimetry

Author

Wang, Z., primary, Hanada, K., additional, Yoshida, N., additional, Shimoji, T., additional, Miyamoto, M., additional, Oya, Y., additional, Zushi, H., additional, Idei, H., additional, Nakamura, K., additional, Fujisawa, A., additional, Nagashima, Y., additional, Hasegawa, M., additional, Kawasaki, S., additional, Higashijima, A., additional, Nakashima, H., additional, Nagata, T., additional, Kawaguchi, A., additional, Fujiwara, T., additional, Araki, K., additional, Mitarai, O., additional, Fukuyama, A., additional, Takase, Y., additional, and Matsumoto, K., additional

Published
2017
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7. A model of plasma current through a hole of Rogowski probe including sheath effects

Author

Furui, H., primary, Ejiri, A., additional, Nagashima, Y., additional, Takase, Y., additional, Sonehara, M., additional, Tsujii, N., additional, Yamaguchi, T., additional, Shinya, T., additional, Togashi, H., additional, Homma, H., additional, Nakamura, K., additional, Takeuchi, T., additional, Yajima, S., additional, Yoshida, Y., additional, Toida, K., additional, Takahashi, W., additional, and Yamazaki, H., additional

Published
2016
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9. Erratum: “Local current density measurement using a Rogowski probe in the Tokyo Spherical Tokamak-2” [Rev. Sci. Instrum. 85, 11D813 (2014)]

Author

Furui, H., primary, Nagashima, Y., additional, Takase, Y., additional, Ejiri, A., additional, Kakuda, H., additional, Sonehara, M., additional, Oosako, T., additional, Tsujii, N., additional, Hiratsuka, J., additional, Imamura, K., additional, Inada, T., additional, Nakamura, K., additional, Nakanishi, A., additional, Shinya, T., additional, Togashi, H., additional, Tsuda, S., additional, Wakatsuki, T., additional, and Yamaguchi, T., additional

Published
2014
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10. Local current density measurement using a Rogowski probe in Tokyo Spherical Tokamak-2

Author

Furui, H., primary, Nagashima, Y., additional, Takase, Y., additional, Ejiri, A., additional, Kakuda, H., additional, Sonehara, M., additional, Oosako, T., additional, Tsujii, N., additional, Hiratsuka, J., additional, Imamura, K., additional, Inada, T., additional, Nakamura, K., additional, Nakanishi, A., additional, Shinya, T., additional, Togashi, H., additional, Tsuda, S., additional, Wakatsuki, T., additional, and Yamaguchi, T., additional

Published
2014
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11. Thermal imaging of plasma with a phased array antenna in QUEST

Author

Mishra, Kishore, primary, Idei, H., additional, Zushi, H., additional, Nagata, K., additional, Akimoto, R., additional, Yamamoto, M. K., additional, Hanada, K., additional, Hasegawa, M., additional, Nakamura, K., additional, Fujisawa, A., additional, Nagashima, Y., additional, Banerjee, S., additional, Onchi, T., additional, and Kuzmin, A., additional

Published
2014
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12. Demonstration of improvement in the signal-to-noise ratio of Thomson scattering signal obtained by using a multi-pass optical cavity on the Tokyo Spherical Tokamak-2

Author

Togashi, H., primary, Ejiri, A., additional, Hiratsuka, J., additional, Nakamura, K., additional, Takase, Y., additional, Yamaguchi, T., additional, Furui, H., additional, Imamura, K., additional, Inada, T., additional, Kakuda, H., additional, Nakanishi, A., additional, Oosako, T., additional, Shinya, T., additional, Sonehara, M., additional, Tsuda, S., additional, Tsujii, N., additional, Wakatsuki, T., additional, Hasegawa, M., additional, Nagashima, Y., additional, Narihara, K., additional, Yamada, I., additional, and Tojo, H., additional

Published
2014
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13. Note: Multi-pass Thomson scattering measurement on the TST-2 spherical tokamak

Author

Togashi, H., primary, Ejiri, A., additional, Hiratsuka, J., additional, Nakamura, K., additional, Takase, Y., additional, Yamaguchi, T., additional, Furui, H., additional, Imamura, K., additional, Inada, T., additional, Kakuda, H., additional, Nakanishi, A., additional, Oosako, T., additional, Shinya, T., additional, Sonehara, M., additional, Tsuda, S., additional, Tsujii, N., additional, Wakatsuki, T., additional, Hasegawa, M., additional, Nagashima, Y., additional, Narihara, K., additional, Yamada, I., additional, and Tojo, H., additional

Published
2014
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14. Fast visible imaging and edge turbulence analysis in QUEST

Author

Banerjee, Santanu, primary, Zushi, H., additional, Nishino, N., additional, Nagashima, Y., additional, Hanada, K., additional, Ishiguro, M., additional, Ryoukai, T., additional, Tashima, S., additional, Inoue, T., additional, Nakamura, K., additional, Idei, H., additional, Hasegawa, M., additional, Fujisawa, A., additional, and Matsuoka, K., additional

Published
2012
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15. Fine positioning of a poloidal probe array

Author

Yamada, T., primary, Nagashima, Y., additional, Inagaki, S., additional, Kawai, Y., additional, Yagi, M., additional, Itoh, S.-I., additional, Maruta, T., additional, Shinohara, S., additional, Terasaka, K., additional, Kawaguchi, M., additional, Fukao, M., additional, Fujisawa, A., additional, and Itoh, K., additional

Published
2007
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17. Electron Bernstein wave emission diagnostic assisted by reflectometry on TST-2 spherical tokamak.

Author

Shiraiwa, S., Nagashima, Y., Ushigome, M., Yamada, T., Taniguchi, T., Ohara, S., Yamagishi, K., Kasahara, H., Iijima, D., Kobori, Y., Nishi, T., Aramasu, M., Ejiri, A., and Takase, Y.

Subjects
*ELECTRON emission, *RADIOMETERS, *SCIENTIFIC apparatus & instruments
Abstract

A new electron Bemstein wave emission diagnostic consisting of a heterodyne radiometer and a reflectometer was installed on TST-2. The instrument has a frequency range from 5 to 12 GHz which covers partially the fundamental and fully covers the second and third harmonic emissions. X-mode emission perpendicular to the flux surface, generated by B-X-FX mode-conversion scenario, is measured. The mode-conversion efficiency is calculated using a one-dimensional full-wave code with the density profile obtained simultaneously from the reflectometer, and the electron temperature (T[sub e]) is estimated. The levels corresponding to the 100-150 eV range are measured from the plasma core region, and the mode-conversion efficiency is calculated to be 0.5-0.8, leading to T[sub e] of approximately 200 eV. In addition, it is found that the reflectivity measured by the reflectometer is consistent with the calculated mode-conversion efficiency. This property can be used for a direct measurement of the mode-conversion efficiency. [ABSTRACT FROM AUTHOR]

Published
2003
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18. Composite antennas for low-frequency gravitational radiation.

Author

Nagashima, Y., Owa, S., Tsubono, K., and Hirakawa, H.

Subjects
*ANTENNAS (Electronics), *GRAVITATIONAL waves, *SCIENTIFIC apparatus & instruments
Abstract

Four types of composite torsion antennas for low-frequency gravitational radiation have been developed and tested at low temperature. They exhibited high quality factors comparable with that of a single-piece antenna. These experiments suggest a large-scale composite antenna may be built and retain a high quality factor. [ABSTRACT FROM AUTHOR]

Published
1988
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19. Development of radially movable multichannel Reynolds stress probe system for a cylindrical laboratory plasma.

Author

Nagashima Y, Inagaki S, Kamakaki K, Arakawa H, Yamada T, Shinohara S, Kawai Y, Yagi M, Fujisawa A, Itoh SI, Itoh K, and Takase Y

Abstract

A new radially movable multichannel azimuthal probe system has been developed for measuring azimuthal and radial profiles of electrostatic Reynolds stress (RS) per mass density of microscale fluctuations for a cylindrical laboratory plasma. The system is composed of 16 probe units arranged azimuthally. Each probe unit has six electrodes to simultaneously measure azimuthal and radial electric fields for obtaining RS. The advantage of the system is that each probe unit is radially movable to measure azimuthal RS profiles at arbitrary radial locations as well as two-dimensional structures of fluctuations. The first result from temporal observation of fluctuation azimuthal profile presents that a low-frequency fluctuation (1-2 kHz) synchronizes oscillating Reynolds stress. In addition, radial scanning of the probe system simultaneously demonstrates two-dimensional patterns of mode structure and nonlinear forces with frequency f = 1.5 kHz and azimuthal mode number m = 1.

Published
2011
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