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Your search keyword '"Sekiguchi H"' showing total 10 results
Start Over Author "Sekiguchi H" Topic electronics and electrical industries
10 results on '"Sekiguchi H"'

1. Increase of operating current of the LHD helical coils by upgrading the cooling system

Author

Imagawa, S., Obana, T., Hamaguchi, S., Yanagi, N., Mito, T., Moriuchi, S., Sekiguchi, H., Ooba, K., Okamura, T., and Komori, A.

Subjects
Electric coils -- Design and construction, Liquid helium -- Usage, Superconducting magnets -- Heating, cooling and ventilation, Business, Electronics, Electronics and electrical industries
Published
2010

2. Performance tests of the subcooling system for the LHD helical coils

Author

Obana, T., Imagawa, S., Hamaguchi, S., Yanagi, N., Moriuchi, S., Sekiguchi, H., Oba, K., and Mito, T.

Subjects
Electric coils -- Heating, cooling and ventilation, Helium -- Thermal properties, Superconductivity -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

Performance tests are carried out on the subcooling system for the Large Helical Device (LHD) helical coils. The studies have shown that the coil temperature is around 3.6 K under a steady heat load of 100 W from outside of the coil case in the system, which has maintained the above performance.

Published
2008

3. Results of the excitation test of the LHD helical coils cooled by subcooled helium

Author

Imagawa, S., Obana, T., Hamaguchi, S., Yanagi, N., Mito, T., Moriuchi, S., Sekiguchi, H., Ooba, K., Okamura, T., Komori, A., and Motojima, O.

Subjects
Helium -- Thermal properties, Superconductors -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

The cryogenic stability of the Large Helical Device (LHD) helical coils is improved by installing an additional cooler like subcooled helium at 3.0 K. The temperature rise by excitation is analyzed as it is required for maintaining low temperatures for better heat transfer.

Published
2008

4. Performance of the helical coils for the large helical device in six years' operation

Author

Imagawa, S., Yanagi, N., Sekiguchi, H., Mito, T., and Motojima, O.

Subjects
Electric coils -- Magnetic properties, Superconducting magnets -- Properties, High temperature superconductors -- Magnetic properties, Business, Electronics, Electronics and electrical industries
Abstract

A study is conducted to investigate the performance of large helical device in pool-cooled superconducting magnet over last six years. The experimental results show that degradation is not observed in the coil performance and the stable operation is demonstrated.

Published
2004

5. Consideration of conductor motions in the helical coils of the Large Helical Device

Author

Imagawa, S., Yanagi, N., Sekiguchi, H., Mito, T., Satow, T., and Motojima, O.

Subjects
Superconducting magnets -- Research, Fusion reactors -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The behavior of conductor motions in the helical coils of the Large Helical Device is described and discussed.

Published
2003

6. Excitation properties and cryogenic stability of helical coils for the LHD

Author

Imagawa, S., Yanagi, N., Mito, T., Chikaraishi, H., Hamaguchi, S., Sekiguchi, H., Yamada, S., Satow, T., Nakamura, Y., Satoh, S., and Motojima, O.

Subjects
Electric coils -- Research, Low temperature engineering -- Research, Superconductors -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Helical coils for the Large Helical Device were studied to determine excitation properties and cryogenic stability.

Published
2001

7. Results of the first excitation of helical coils of the large helical device

Author

Imagawa, S., Yanagi, N., Chikaraishi, H., Mito, T., Takahata, K., Hamaguchi, S., Sekiguchi, H., Yamada, S., Satow, T., Nakamura, Y., Satoh, S., and Motojima, O.

Subjects
Magnetic circuits -- Research, Superconducting magnets -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The first excitation of helical coils of the Large Helical Device has successfully taken place.

Published
2000

8. Performance of the LHD cryogenic system during cooling and excitation tests

Author

Mito, T., Maekawa, R., Iwamoto, A., Imagawa, S., Takahata, K., Yamada, S., Yanagi, N., Nishimura, A., Tamura, H., Chikaraishi, H., Hamaguchi, S., Baba, T., Moriuchi, s., Oba, K., Sekiguchi, H., Otake, I., Satow, T., Nakamura, Y., Satoh, S., and Motojima, O.

Subjects
Cooling -- Methods, Hadrons -- Usage, Superconductivity -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The Large Hadron Collider cryogenic system was observed during cooling and excitation tests.

Published
2000

10. [sup.14]C Measurement of Synthesized Benzene from Old Tree Rings

Author

Endo, K., Sakurai, H., Sekiguchi, H., Gunji, S., Kato, A., Furusawa, S., Inui, E., Suzuki, A., and Hamano, M.

Subjects
Nuclear research -- Observations, Dendrochronology -- Research, Benzene -- Measurement, Business, Electronics, Electronics and electrical industries
Abstract

To measure at an accuracy of [is less than] 0.2% the variations of the [sup.14]C concentration in old tree rings, we have constructed a high accurate [sup.14]C measuring system composed of a benzene synthesizer and a Quantulus 1220[TM]. The detection efficiency decreased in proportion to the number of shift channel in the [sup.14]C spectrum due to the quenching effect. The decreasing rate was 0.092% for 1 channel shift. Analysis by ion-chromatography showed that the ion [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] in the benzene sample was a main factor quenching the spectrum. The counting stability of the Quantulus for long term measurement was tested using the synthesized benzene samples for the duration of 5 months. All the data were distributed according to Poisson statistics and were within the Poisson counting precision of 3[[Sigma].sub.p] around the average counts. We conclude that the counting fluctuation of the Quantulus is almost determined by the Poisson counting statistics. Moreover, from the data analysis for the trend of the counting rate, it is indicated that the Quantulus operates with a high stability and has the possibility to detect the systematic variations of the counting rate which are 0.3% in the duration of 5 months.

Published
2000

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