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Journal Articles

Development of laser beam injection system for the Edge Thomson Scattering (ETS) in ITER

Yatsuka, Eiichi; Hatae, Takaki; Suito, Satoshi*; Ohara, Miyuki*; Hagita, Koji*; Inoue, Kazunori*; Bassan, M.*; Walsh, M.*; Itami, Kiyoshi

Journal of Instrumentation (Internet), 11(1), p.C01006_1 - C01006_12, 2016/01

 Times Cited Count:5 Percentile:66.58(Instruments & Instrumentation)

Journal Articles

Enhancement of resistance against high energy laser pulse injection with chevron beam dump

Yatsuka, Eiichi; Hatae, Takaki; Bassan, M.*; Vayakis, G.*; Walsh, M.*; Itami, Kiyoshi

Fusion Engineering and Design, 100, p.461 - 467, 2015/11

 Times Cited Count:3 Percentile:63.46(Nuclear Science & Technology)

Journal Articles

Development of instrumentation and control systems for the ITER diagnostic systems in JADA

Yamamoto, Tsuyoshi; Hashimoto, Yasunori*; Kitazawa, Sin-iti; Yatsuka, Eiichi; Hatae, Takaki; Sugie, Tatsuo; Ogawa, Hiroaki; Takeuchi, Masaki; Kawano, Yasunori; Itami, Kiyoshi

Fusion Engineering and Design, 96-97, p.1012 - 1016, 2015/10

 Times Cited Count:4 Percentile:54.36(Nuclear Science & Technology)

Japan Domestic Agency (JADA) is responsible for six diagnostic systems in the ITER project. We have successfully developed an instrumentation and control (I&C) system for the diagnostic systems. The I&C system manages internal operations for measurement such as health checks of sensors, configuration of measurement parameters, and consistency checks between measurement parameters. We developed a conversion tool to convert operational flowcharts to EPICS records. The sequencing management function coordinates the execution of operation steps by monitoring changes in the record values. It was designed so that the relationship between the records and steps is determined automatically according to the flowcharts as much as possible. We validated the performance of the I&C system for the thermocouple measurement system, and are continuing the development of even more complex I&C systems for other JADA diagnostic systems.

Journal Articles

Signal evaluations using singular value decomposition for Thomson scattering diagnostics

Tojo, Hiroshi; Yamada, Ichihiro*; Yasuhara, Ryo*; Yatsuka, Eiichi; Funaba, Hisamichi*; Hatae, Takaki; Hayashi, Hiroshi*; Itami, Kiyoshi

Review of Scientific Instruments, 85(11), p.11D865_1 - 11D865_3, 2014/11

 Times Cited Count:1 Percentile:92.51(Instruments & Instrumentation)

Journal Articles

Progresses in development of the ITER edge Thomson scattering system

Yatsuka, Eiichi; Bassan, M.*; Hatae, Takaki; Ishikawa, Masao; Shimada, Takahiko; Vayakis, G.*; Walsh, M.*; Scannell, R.*; Huxford, R.*; Bilkova, P.*; et al.

Journal of Instrumentation (Internet), 8(12), p.C12001_1 - C12001_10, 2013/12

 Times Cited Count:6 Percentile:62.45(Instruments & Instrumentation)

Journal Articles

Chevron beam dump for ITER edge Thomson scattering system

Yatsuka, Eiichi; Hatae, Takaki; Vayakis, G.*; Bassan, M.*; Itami, Kiyoshi

Review of Scientific Instruments, 84(10), p.103503_1 - 103503_6, 2013/10

 Times Cited Count:7 Percentile:58.14(Instruments & Instrumentation)

Journal Articles

New developments of the Thomson scattering diagnostic system in magnetic-confined plasma devices

Hatae, Takaki; Yoshida, Hidetsugu*; Yatsuka, Eiichi

Purazuma, Kaku Yugo Gakkai-Shi, 88(10), p.555 - 574, 2012/10

no abstracts in English

Journal Articles

Development of a YAG laser system for the edge Thomson scattering system in ITER

Hatae, Takaki; Yatsuka, Eiichi; Hayashi, Toshimitsu; Yoshida, Hidetsugu*; Ono, Takehiro; Kusama, Yoshinori

Review of Scientific Instruments, 83(10), p.10E344_1 - 10E344_3, 2012/10

 Times Cited Count:10 Percentile:48.68(Instruments & Instrumentation)

A prototype YAG laser system for the edge Thomson scattering system in ITER has been newly developed. Performance of the laser amplifier was improved by using flow tubes made of samarium-doped glass; the small signal gain reached 20 at its maximum. As a result, an output energy of 7.66 J at 100 Hz was successfully achieved, and the performance exceeded the target performance (5 J, 100 Hz).

Journal Articles

Anisotropic electron temperature measurements without knowing the spectral transmissivity for a JT-60SA Thomson scattering diagnostic

Tojo, Hiroshi; Hatae, Takaki; Yatsuka, Eiichi; Itami, Kiyoshi

Review of Scientific Instruments, 83(10), p.10E346_1 - 10E346_3, 2012/10

 Times Cited Count:0 Percentile:100(Instruments & Instrumentation)

Journal Articles

Polychromator for the edge Thomson scattering system in ITER

Yatsuka, Eiichi; Hatae, Takaki; Fujie, Daijiro*; Kurokawa, Atsuo*; Kusama, Yoshinori

Review of Scientific Instruments, 83(10), p.10E328_1 - 10E328_3, 2012/07

 Times Cited Count:2 Percentile:85.12(Instruments & Instrumentation)

On the edge Thomson scattering (TS) system in ITER, the filter polychromator is used for dispersing the scattered radiation. Since the signal in TS system is very small, it is crucial to reduce the signal loss from the collection optics to the spectrometer. A band of wavelength in the signal is extracted by an interference filter, and the remaining part is reflected at the interference filter. On the conventional polychromator, a number of reflections are necessary for extracting all wavelength bands. We proposed a new type of polychromator. On the new polychromator, both transmitted and reflected signal from an interference filter are dispersed into transmitted and reflected parts again. It enables to reduce the number of reflection at the interference filters. We showed it is possible to apply in the edge TS system in ITER by setting the injection angle of signal light into the interference filters to be approximately less than 10 degrees.

Journal Articles

Principles for local measurement of the anisotropic electron temperature of plasma using incoherent Thomson scattering

Yatsuka, Eiichi; Hatae, Takaki; Kusama, Yoshinori

Nuclear Fusion, 51(12), p.123004_1 - 123004_4, 2011/12

 Times Cited Count:5 Percentile:72.32(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Neutronic analysis of the ITER poloidal polarimeter

Ishikawa, Masao; Kawano, Yasunori; Imazawa, Ryota; Sato, Satoshi; Vayakis, G.*; Bertalot, L.*; Yatsuka, Eiichi; Hatae, Takaki; Kondoh, Takashi; Kusama, Yoshinori

Fusion Engineering and Design, 86(6-8), p.1286 - 1289, 2011/10

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

The nuclear heating rates of the optical mirrors of the poloidal polarimeter installed in the equatorial port plug of ITER are calculated. Since the system cannot have a sufficiently labyrinthine structure and the second mirrors are located nearly as close to the plasma as the first mirrors due to limited space, the nuclear heating rate of the second mirrors is as high as that of the first mirrors. However, it is possible to reduce the nuclear heating rates of the mirrors if the blanket shield module provides a sufficient degree of neutron shielding.

Journal Articles

Plasma boundary and first-wall diagnostics in ITER

Pitcher, C. S.*; Andrew, P.*; Barnsley, R.*; Bertalot, L.*; Counsell, G. G.*; Encheva, A.*; Feder, R. E.*; Hatae, Takaki; Johnson, D. W.*; Kim, J.*; et al.

Journal of Nuclear Materials, 415(Suppl.1), p.S1127 - S1132, 2011/08

 Times Cited Count:0 Percentile:100(Materials Science, Multidisciplinary)

Journal Articles

Conceptual design of the collection optics for the edge Thomson scattering system in ITER

Yatsuka, Eiichi; Hatae, Takaki; Suito, Satoshi*; Aida, Yoshiyuki*; Kusama, Yoshinori

Review of Scientific Instruments, 81(10), p.10D541_1 - 10D541_4, 2010/10

 Times Cited Count:6 Percentile:64.92(Instruments & Instrumentation)

Journal Articles

A Self-calibration method for the edge Thomson scattering diagnostic in ITER

Yatsuka, Eiichi; Hatae, Takaki; Kusama, Yoshinori

Journal of Plasma and Fusion Research SERIES, Vol.9, p.12 - 17, 2010/08

Journal Articles

Development of prototype YAG laser amplifier for the edge Thomson scattering system in ITER

Hatae, Takaki; Hayashi, Toshimitsu; Yatsuka, Eiichi; Kajita, Shin*; Yoshida, Hidetsugu*; Fujita, Hisanori*; Nakatsuka, Masahiro*; Yahagi, Kenichi*; Shinobu, Katsuya*; Ono, Takehiro; et al.

Journal of Plasma and Fusion Research SERIES, Vol.9, p.253 - 258, 2010/08

Oral presentation

Progress in ITER diagnostics development in Japan

Kawano, Yasunori; Iwamae, Atsushi; Ogawa, Hiroaki; Sugie, Tatsuo; Hatae, Takaki; Yatsuka, Eiichi; Kondoh, Takashi; Ishikawa, Masao; Sato, Kazuyoshi; Hayashi, Toshimitsu; et al.

no journal, , 

no abstracts in English

Oral presentation

Progress in ITER diagnostics development in Japan

Kawano, Yasunori; Kondoh, Takashi; Ishikawa, Masao; Ogawa, Hiroaki; Iwamae, Atsushi; Sugie, Tatsuo; Sato, Kazuyoshi; Hatae, Takaki; Yatsuka, Eiichi; Hayashi, Toshimitsu; et al.

no journal, , 

no abstracts in English

Oral presentation

Status and plan of ITER diagnostics development

Kusama, Yoshinori; Kawano, Yasunori; Sugie, Tatsuo; Kondoh, Takashi; Ogawa, Hiroaki; Hatae, Takaki; Sato, Kazuyoshi; Suzuki, Satoshi; Hayashi, Toshimitsu; Ono, Takehiro; et al.

no journal, , 

no abstracts in English

68 (Records 1-20 displayed on this page)