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Journal Articles

An Optical design and accuracy estimation for a JT-60SA edge Thomson scattering diagnostic

Tojo, Hiroshi; Hatae, Takaki; Hamano, Takashi; Sakuma, Takeshi; Itami, Kiyoshi

Journal of Instrumentation (Internet), 8(12), p.C12025_1 - C12025_13, 2013/12

 Times Cited Count:1 Percentile:8.02(Instruments & Instrumentation)

Journal Articles

Optical designs of reflection and refraction collection optics for a JT-60SA core Thomson scattering system

Tojo, Hiroshi; Hatae, Takaki; Hamano, Takashi; Sakuma, Takeshi; Itami, Kiyoshi

Review of Scientific Instruments, 84(9), p.093506_1 - 093506_8, 2013/09

 Times Cited Count:2 Percentile:14.21(Instruments & Instrumentation)

Journal Articles

Fatal damages due to breakdown on a diagnostic mirror located outside the vaccum vessel in JT-60U

Kajita, Shin*; Hatae, Takaki; Sakuma, Takeshi; Takamura, Shuichi*; Ono, Noriyasu*; Itami, Kiyoshi

Plasma and Fusion Research (Internet), 7(Sp.1), p.2405121_1 - 2405121_4, 2012/09

Journal Articles

Design of collection optics and polychromators for a JT-60SA Thomson scattering system

Tojo, Hiroshi; Hatae, Takaki; Sakuma, Takeshi; Hamano, Takashi; Itami, Kiyoshi; Aida, Yoshiaki*; Suito, Satoshi*; Fujie, Daijiro*

Review of Scientific Instruments, 81(10), p.10D539_1 - 10D539_3, 2010/10

 Times Cited Count:10 Percentile:47.36(Instruments & Instrumentation)

Designs of collection optics for JT-60SA Thomson scattering system are presented. By using tangential (to the toroidal direction) YAG laser injection, three collection optics without strong chromatic aberrations generated by the wide viewing angle and small design volume measure almost all the radial space. For the edge plasma measurements, we optimized the channel number and wavelength ranges of band-pass filters in polychromator to reduce relative error in the electron temperature by considering the all spatial channels and double-pass laser system with different geometric parameters.

Journal Articles

Conceptual design of polychromator for Thomson scattering system in JT-60SA

Tojo, Hiroshi; Hatae, Takaki; Sakuma, Takeshi; Hamano, Takashi; Itami, Kiyoshi

Journal of Plasma and Fusion Research SERIES, Vol.9, p.288 - 293, 2010/08

Significant loss in transmissivity of the used fiber after the 18 years operations in JT-60U are found. Therefore, an optimization of the filter's configuration of the polychromator in Thomson scattering system for the high performance plasmas in JT-60SA is an essential task. Especially, loss in optical components induced by radiation from neutrons and $$gamma$$-ray should be examined. In this paper, an optimization of the filter configuration in the polychromator is executed and expected error degradation due to the radiation damages in the measurements are also estimated with a comparison between used fibers in JT-60U and radiation resistance fibers. In $$T_{rm e}$$ $$>$$ 10 keV, the time evolution of the averaged relative errors for the radiation resistance fibers increase from 3$$sim$$5% by $$sim 1%$$. However, for the used fibers in JT-60U, the errors are 7$$sim$$8% and they reaches more than 10% in some high $$T_{rm e}$$ conditions, suggesting some difficulties in the measurements.

Journal Articles

Development of polarization interferometer for Thomson scattering diagnostics in JT-60U

Hatae, Takaki; Howard, J.*; Ebizuka, Noboru*; Hirano, Yoichi*; Koguchi, Haruhisa*; Kitamura, Shigeru; Sakuma, Takeshi; Hamano, Takashi

Journal of Plasma and Fusion Research SERIES, Vol.8, p.680 - 684, 2009/09

A polarization interferometer based on the Fourier transform spectroscopy for the Thomson scattering diagnostics is being developed to evaluate the validity. At the first stage, a dual channel polarization interferometer utilizing a fixed-thickness birefringent plate is developed, and the target $$T_{e}$$ and $$n_{e}$$ ranges were $$<$$ 1 keV and $$>$$ 5$$times$$10$$^{18}$$ m$$^{-3}$$, respectively. The electron temperature is successfully measured by the dual channel polarization interferometer in TPE-RX reversed field pinch machine, for the first time. The temperature of the polarization interferometer nearly agrees with that of the filter polychromator. At the second stage, we are developing a multichannel polarization interferometer employing a Wallaston prism to cover wider range of electron temperature. Interferograms of three kinds of light sources are measured by the multichannel polarization interferometer, and those spectra are reconstructed by Fourier transform. In the measurement of a blackbody radiation source using the multichannel polarization interferometer, both ideal and measured spectra agree within 8%.

Journal Articles

Applications of stimulated brillouin scattering phase conjugate mirror to Thomson scattering diagnostics in JT-60U and ITER

Hatae, Takaki; Naito, Osamu; Kitamura, Shigeru; Sakuma, Takeshi*; Hamano, Takashi*; Nakatsuka, Masahiro*; Yoshida, Hidetsugu*

Journal of the Korean Physical Society, 49, p.S160 - S164, 2006/12

no abstracts in English

Journal Articles

Improvement of Thomson scattering system using SBS phase conjugation mirrors in JT-60U

Hatae, Takaki; Nakatsuka, Masahiro*; Yoshida, Hidetsugu*; Naito, Osamu; Kitamura, Shigeru; Sakuma, Takeshi*; Hamano, Takashi*; Tsukahara, Yoshimitsu

Proceedings of 29th European Physical Society Conference on Plasma Physics and Controlled Fusion, 4 Pages, 2002/00

no abstracts in English

Oral presentation

Review of the operation in the JT-60 Thomson scattering diagnostics system

Sakuma, Takeshi; Hatae, Takaki; Kitamura, Shigeru; Hamano, Takashi; Naito, Osamu

no journal, , 

no abstracts in English

Oral presentation

Design of collection optics and port-plug for Thomson scattering system in JT-60SA

Tojo, Hiroshi; Hatae, Takaki; Sakuma, Takeshi; Hamano, Takashi; Shinohara, Koji; Itami, Kiyoshi; Aida, Yoshiaki*; Suito, Satoshi*; Fujie, Daijiro*

no journal, , 

Conceptual designs of the collection optics for JT-60SA Thomson scattering have been done. Adapting four glass materials of the lenses used for the collection optics enables to correct the chromatic aberrations with good resolution ($$>$$ 1 mm). The whole radial profile can be measured using three designed collection optics in Port-P1, P2 and P5. The collection optics will be installed in port-plugs accessing from the cryostat to vacuum vessel. In a disruption with a decrease of the plasma current by a time scale of 5 MA/8 ms, the eddy current ($$sim$$0.1 MA/m$$^{2}$$) is strongly generated in the area of 500 mm from the edge of the port-plug with the thickness of 30 mm. Even if the thickness is reduced to 20 mm decreasing the current in the area, the maximum principal stress is still under the limit value for the design.

Oral presentation

Application of SBS phase conjugate mirror to fusion plasma diagnostics

Hatae, Takaki; Kitamura, Shigeru; Sakuma, Takeshi; Hamano, Takashi; Tojo, Hiroshi; Yoshida, Hidetsugu*; Fujita, Hisanori*; Nakatsuka, Masahiro*; Narihara, Kazumichi*; Yamada, Ichihiro*; et al.

no journal, , 

Oral presentation

Development of a Thomson scattering diagnostic design for JT-60SA

Tojo, Hiroshi; Hatae, Takaki; Sakuma, Takeshi; Hamano, Takashi; Itami, Kiyoshi

no journal, , 

Oral presentation

Development of Thomson scattering diagnostics in JT-60SA

Tojo, Hiroshi; Hatae, Takaki; Sakuma, Takeshi; Hamano, Takashi; Itami, Kiyoshi; Ejiri, Akira*; Hiratsuka, Junichi*; Yamaguchi, Takashi*; Takase, Yuichi*

no journal, , 

no abstracts in English

Oral presentation

Development of advanced laser system for Thomson scattering diagnostics

Hatae, Takaki; Yatsuka, Eiichi; Yoshida, Hidetsugu*; Fujita, Hisanori*; Tsubakimoto, Koji*; Nakatsuka, Masahiro*; Yasuhara, Ryo*; Tojo, Hiroshi; Sakuma, Takeshi

no journal, , 

no abstracts in English

Oral presentation

Progress of diagnostics development in JAEA

Kawano, Yasunori; Sugie, Tatsuo; Ogawa, Hiroaki; Tojo, Hiroshi; Yatsuka, Eiichi; Imazawa, Ryota; Hatae, Takaki; Hamano, Takashi; Sakuma, Takeshi; Takeuchi, Masaki; et al.

no journal, , 

no abstracts in English

Oral presentation

Progress of diagnostics development in JAEA

Kawano, Yasunori; Takeuchi, Masaki; Tojo, Hiroshi; Kitazawa, Sin-iti; Yamamoto, Tsuyoshi; Takeyama, Shigeharu; Yatsuka, Eiichi; Imazawa, Ryota; Sakuma, Takeshi; Shimada, Takahiko; et al.

no journal, , 

no abstracts in English

Oral presentation

Developments of a JT-60SA Thomson scattering diagnostic

Tojo, Hiroshi; Hatae, Takaki; Sakuma, Takeshi; Hamano, Takashi; Itami, Kiyoshi; Suito, Satoshi*; Araki, Takashi*; Iwamoto, Kohei*; Takeda, Yuya*

no journal, , 

Oral presentation

Developments of a JT-60SA Thomson scattering diagnostic

Tojo, Hiroshi; Hatae, Takaki; Sakuma, Takeshi; Hamano, Takashi; Itami, Kiyoshi

no journal, , 

no abstracts in English

Oral presentation

Design of a JT-60SA Thomson scattering system

Tojo, Hiroshi; Hatae, Takaki; Sakuma, Takeshi; Hamano, Takashi; Itami, Kiyoshi

no journal, , 

no abstracts in English

Oral presentation

Present status of Thomson scattering diagnostic design on JT-60SA

Tojo, Hiroshi; Hatae, Takaki; Sakuma, Takeshi; Hamano, Takashi; Itami, Kiyoshi

no journal, , 

23 (Records 1-20 displayed on this page)