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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:8 Percentile:41.42(Instruments & Instrumentation)

Journal Articles

Development of divertor IR thermography for ITER

Takeuchi, Masaki; Sugie, Tatsuo; Ogawa, Hiroaki; Ishikawa, Masao; Shimada, Takahiko; Kusama, Yoshinori

Plasma and Fusion Research (Internet), 8(Sp.1), p.2402147_1 - 2402147_5, 2013/11

Divertor IR Thermography is one of the diagnostics which Japan is in charge of development in ITER project. The conceptual design has been performed so far, and the progress is reported here. By reducing the size of mirrors, and making the optical path a labyrinthine structure, the design of a new optics that fills requirements of both spatial resolution and neutron shielding has been advanced. To achieve the required measurement accuracy, the detected signal and the noises such as bremsstrahlung light, detector noise and thermal noise of optical components were evaluated. Higher photons than the bremsstrahlung light are obtained, excluding the low temperature range. The simulation calculation of reflection from wall was started. Detailed method of data processing of deriving the profiles of surface temperature in the divertor plates from the observed signals and in-situ calibration strategies of the optical system are important issues and will be discussed.

Journal Articles

Radiological issues and future perspectives on Fukushima nuclear accident from the viewpoint of young researchers and students

Ogino, Haruyuki*; Tani, Kotaro*; Kono, Takahiko; Shimada, Kazumasa*; Fujimichi, Yuki*

Hoken Butsuri, 46(3), p.197 - 204, 2011/09

no abstracts in English

Oral presentation

Suggestion from young researchers about internal exposure management in Fukushima Nuclear Power Plant accident

Kono, Takahiko; Ogino, Haruyuki*; Koike, Yuya*; Fujiwara, Keiko*; Shimada, Kazumasa*; Tani, Kotaro*; Fujimichi, Yuki*

no journal, , 

no abstracts in English

Oral presentation

Aiming to establish a rational system of radiation protection in Japan; How to incorporate the international standards

Ogino, Haruyuki*; Kono, Takahiko; Shimada, Kazumasa*; Tani, Kotaro*; Fujimichi, Yuki*

no journal, , 

no abstracts in English

Oral presentation

Progress in ITER diagnostics development in Japan

Kawano, Yasunori; Kondoh, Takashi; Ishikawa, Masao; Hatae, Takaki; Yatsuka, Eiichi; Imazawa, Ryota; Ogawa, Hiroaki; Sugie, Tatsuo; Takeuchi, Masaki; Sato, Kazuyoshi; et al.

no journal, , 

Recent progress in development of ITER diagnostic systems in Japan is presented as briefly shown below. (1) Microfission Chamber: A prototyping of vacuum feedthrough showed that the vacuum leak rate satisfies that of ITER requirement. (2) Thomson scattering (edge): A new method proposed for the measurement of anisotropic electron temperature was presented. (3) Poloidal Polarimeter: Measurement accuracy of the poloidal polarimeter was evaluated so that the accuracy of resultant current profile can satisfy the ITER measurement requirement. (4) Impurity influx monitor (divertor): By improvement of the design of equatorial port optics, expected detected light was 16 times increased in comparison with that of the previous design. (5) Divertor thermocouples (outer target): Investigation was started about the fixation method of the thermocouple on the side of divertor outer target. (6) Divertor IR thermography: Conceptual design activity was started for equatorial port optics.

Oral presentation

Progress in ITER diagnostics development in Japan

Kawano, Yasunori; Hatae, Takaki; Yatsuka, Eiichi; Sugie, Tatsuo; Takeuchi, Masaki; Ogawa, Hiroaki; Imazawa, Ryota; Ono, Takehiro; Kondoh, Takashi; Ishikawa, Masao; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of divertor IR thermography for ITER

Takeuchi, Masaki; Sugie, Tatsuo; Ogawa, Hiroaki; Ishikawa, Masao; Shimada, Takahiko; Kusama, Yoshinori

no journal, , 

In ITER project, it reports on the progress of the conceptual design of Divertor IR Thermography which is one of the diagnostics Japan is in charge of development. The conceptual design of the optical system was done based on the measurement requirement, and the performance was evaluated. The angle of field of view is 2.5 degree for the outer divertor and 4.0 degree for the inner divertor, therefore wide fields of view are achieved. The spatial resolution fills 3 mm of the measurement requirement in the center field of view though it depends on the observed wavelength. Moreover, nuclear heating of mirrors in the optical system is 0.1 W / cc excluding the first mirror. The prospect that the mirrors can be cooled is obtained. Future tasks include optimization of the optical system that spatial resolution coexists with neutron shielding, development of calibration method and the mechanical designs of shutters and mirror holders.

Oral presentation

Development of divertor IR thermography for ITER

Takeuchi, Masaki; Sugie, Tatsuo; Ogawa, Hiroaki; Ishikawa, Masao; Shimada, Takahiko; Itami, Kiyoshi

no journal, , 

The development of Divertor IR Thermography which is one of the diagnostics Japan will procure in ITER project has been advanced. The system design, the optical design and the evaluation of detected photons was performed based on the measurement requirements. The detection system consists of the two color system and the spectroscopic system. There are two optical paths for inner and outer divertor to satisfy the spatial resolution of 3 mm. By making dogleg structures, the shut down dose rate in the inter space was reduced by half from that of previous optical design. In the case of low emissivity as like tungsten, the detected photons were evaluated. Higher photons than the bremsstrahlung light are obtained in the wavelength of 3 and 5 $$mu$$m, excluding the low temperature range less than about 500 $$^{circ}$$C.

Oral presentation

Neutronic analysis for iter diagnostics procured by Japan Domestic Agency

Ishikawa, Masao; Shimada, Takahiko; Takeuchi, Masaki; Imazawa, Ryota; Yatsuka, Eiichi; Ogawa, Hiroaki; Hatae, Takaki; Sugie, Tatsuo; Kawano, Yasunori; Kondoh, Takashi; et al.

no journal, , 

The results of neuronic analysis to design ITER diagnostics (Poloidal Polarimeter, Edge Thomson Scattering System, Divertor Impurity Flux Monitor and IR Thermography) procured by Japan Domestic Agency are reported. Nuclear heating of plasma facing mirrors of those diagnostics is evaluated $$sim$$1 w/cc during ITER operation. Dependence of nuclear heating of the mirrors on the aperture size of beam line, that is the effect of radiation shield, is also estimated. Thermal analysis is performed based on the results of those nuclear analysis and then cooling system of mirror is being developed.

Oral presentation

Development of divertor IR thermography for ITER

Takeuchi, Masaki; Sugie, Tatsuo; Ogawa, Hiroaki; Ishikawa, Masao; Shimada, Takahiko; Itami, Kiyoshi

no journal, , 

In ITER project, Divertor IR Thermography which Japan will procure has been developed. The system design, optical design and evaluation of detected photons were performed based on the measurement requirement. Detected system consists of two color system and spectroscopic system. The derivation of the surface temperature on the divertor plate will be calculated from the combination of the obtained data by the detected system. There are two optical paths consisted of three parts for the observation of outer and inner divertors to be satisfied the spatial resolution of 3 mm. Higher photons than the bremsstrahlung light which was calculated in the case of ITER operation scenario 2 are expected to be obtained, excluding the low temperature range.

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

Development of the ITER diagnostic systems by JADA

Itami, Kiyoshi; Kawano, Yasunori; Hatae, Takaki; Ishikawa, Masao; Ogawa, Hiroaki; Sugie, Tatsuo; Yamamoto, Tsuyoshi; Kondoh, Takashi; Kitazawa, Sin-iti; Yatsuka, Eiichi; et al.

no journal, , 

Oral presentation

Neutronic analysis for detail design of the microfission chamber for ITER neutron flux monitor

Ishikawa, Masao; Takeda, Keigo*; Kondoh, Takashi; Shimada, Takahiko

no journal, , 

A Microfission Chamber (MFC) provides time-resolved measurements of global neutron source strength and fusion power in ITER. MFCs will be installed behind blanket modules at upper and lower outboard position due to interface considerations with other equipment and the vacuum vessel. Since the location of the MFC is close to the Plasma, sensitivities of MFCs vary due to the change of the plasma position. In this study, a method to obtain neutron source strength accurately has been investigated using Neutron Transport Analysis Code (MCNP) if the plasma position would be changed. As a result, it was found that the linear combination of the MFCs at the upper and lower outboard position, in which weight of change of sensitivity of each MFC due to the change of the plasma position, can keep the output consist within error of 3%.

Oral presentation

Design and development of the edge Thomson scattering system in ITER

Hatae, Takaki; Yatsuka, Eiichi; Shimada, Takahiko; Ishikawa, Masao; Itami, Kiyoshi

no journal, , 

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

Development of divertor IR thermography for ITER

Sugie, Tatsuo; Takeuchi, Masaki; Ishikawa, Masao; Shimada, Takahiko; Katsunuma, Atsushi*; Kitazawa, Daisuke*; Omori, Keisuke*; Itami, Kiyoshi

no journal, , 

no abstracts in English

Oral presentation

Neutronic analysis for detailed design of ITER Edge Thomson Scattering System

Shimada, Takahiko; Ishikawa, Masao; Yatsuka, Eiichi; Hatae, Takaki; Itami, Kiyoshi

no journal, , 

Neutronic analysis has been carried out for the detailed design of Edge Thomson Scattering System (ETS) which is procured by JAEA in the ITER project. ETS measures the profile of electron temperature and density in the edge region of the plasma and consists of the laser injection system and the optical collection system installed in the EQ port plug. The optical collection system consists of many mirrors. High nuclear heating of mirrors could distorts them and deteriorates measurement accuracy. In order to reduce nuclear heating of optical mirrors, the effect of materials on nuclear heating of the optical mirrors has been evaluated. As a result, nuclear heating rate can be reduced about 25% by replacing the material of the first mirror (plasma facing mirror) from molybdenum to SUS316. Also it was found that nuclear heating rate of other mirrors can decrease about 65% by replacing materials from SUS316 to Aluminium. As described above, the appropriate material for each optical mirrors can be selected by nutronic analysis.

Oral presentation

Development of divertor IR thermography for ITER

Sugie, Tatsuo; Takeuchi, Masaki; Takeyama, Shigeharu; Ishikawa, Masao; Shimada, Takahiko

no journal, , 

no abstracts in English

Oral presentation

Development of the edge Thomson scattering system in ITER

Yatsuka, Eiichi; Hatae, Takaki; Shimada, Takahiko; Itami, Kiyoshi

no journal, , 

no abstracts in English

22 (Records 1-20 displayed on this page)