ITPA (International Tokamak Physics Activity) meeting report, 53

Kawano, Yasunori; Akiyama, Tsuyoshi*; Ishikawa, Masao; Isobe, Mitsutaka*; Itami, Kiyoshi; Ejiri, Akira*; Peterson, B.*

Purazuma, Kaku Yugo Gakkai-Shi, 92(2), P. 145, 2016/02

http://www.jspf.or.jp/Journal/PDF_JSPF/jspf2016_02/jspf2016_02-145.pdf

no abstracts in English

Development of real-time rotating waveplate Stokes polarimeter using multi-order retardation for ITER poloidal polarimeter

Imazawa, Ryota; Kawano, Yasunori; Ono, Takehiro; Itami, Kiyoshi

Review of Scientific Instruments, 87(1), p.013503_1 - 013503_7, 2016/01

AA2015-0219.pdf:1.34MB

https://doi.org/10.1063/1.4939444

no abstracts in English

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

https://doi.org/10.1016/j.fusengdes.2015.06.119

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.

Meshless method for solving fixed boundary problem of plasma equilibrium

Imazawa, Ryota; Kawano, Yasunori; Itami, Kiyoshi

Journal of Computational Physics, 292, p.208 - 214, 2015/07

https://doi.org/10.1016/j.jcp.2015.03.035

no abstracts in English

Preparation for lower port integration engineering for ITER diagnostic systems in JADA

Kitazawa, Sin-iti; Maruyama, Toshiyuki; Ogawa, Hiroaki; Itami, Kiyoshi; Casal, N.*

Plasma and Fusion Research (Internet), 10(Sp.2), p.3402044_1 - 3402044_4, 2015/04

https://doi.org/10.1585/pfr.10.3402044

Design study of a wide-angle infrared thermography and visible observation diagnostic on JT-60SA

Kamiya, Kensaku; Itami, Kiyoshi; Takeuchi, Masaki; Enokuchi, Akito*

Fusion Engineering and Design, 89(12), p.3089 - 3094, 2014/12

https://doi.org/10.1016/j.fusengdes.2014.09.011

Design study of a wide-angle infrared (IR) thermography and visible observation diagnostics for JT-60SA are reported. In order to image a large section inside the vacuum vessel (both in poloidal and toroidal directions), the optical system of endoscope is to provide a wide-angle view in the IR and visible range, which is being designed with a field of view of 106 degrees vertical and 63 degrees horizontal. The estimated spatial resolution is better than a few cm at a distance of 7.6 m from the front optics with a slit diameter of 4 mm.

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

https://doi.org/10.1063/1.4896478

Magnification of a polarization angle with a Littrow layout brazed grating

Sasao, Hajime; Arakawa, Hiroyuki*; Kubo, Hirotaka; Kawano, Yasunori; Itami, Kiyoshi

Review of Scientific Instruments, 85(8), p.086106_1 - 086106_3, 2014/08

https://doi.org/10.1063/1.4892478

Progress of preparation for ITER divertor thermocouple in JADA

Kitazawa, Sin-iti; Yamamoto, Tsuyoshi; Kawano, Yasunori; Itami, Kiyoshi

Plasma and Fusion Research (Internet), 9(Sp.2), p.3405049_1 - 3405049_4, 2014/05

https://doi.org/10.1585/pfr.9.3405049

The Japan Domestic Agency (JADA) is scheduled to procure a divertor thermocouple (DTC) system for the divertor outer vertical targets in the ITER project. The DTC is a diagnostic device that will directly measure the surface temperature of the divertor, a plasma-facing component, and will be installed on the surface of the divertors which are in the scope of JADA procurement sharing. A thermocouple itself is a conventional device used for measuring temperature, however, for the DTC to be able to take highly reliable operation under the ultrahigh vacuum and high radiation field of the ITER environment. Therefore various advanced research and development is necessary. Development of the DTC control system, which is based on ITER standards, should also be performed since it is included within the scope of JADA procurement. In this presentation, we will show the current status of research & development on the DTC.

Linearity-independent method for a safety factor profile

Imazawa, Ryota; Kawano, Yasunori; Itami, Kiyoshi; Kusama, Yoshinori

Nuclear Fusion, 54(1), p.013012_1 - 013012_8, 2014/01

https://doi.org/10.1088/0029-5515/54/1/013012

This paper proposes a new method to calculate a safety factor, , profile from gridded data of a poloidal flux, , efficiently and accurately. Difficulties of calculating are derived from a difficulty of specifying a contour line of and a singularity at a magnetic axis. In order to solve the first difficulty, the proposed method interpolates knots, which are located on a target , by utilizing a normalized arc length and constraints expressed by a magnetic field. Regarding the second difficulty, the proposed method identifies by extrapolating profile around a magnetic axis with a constraint of at the magnetic axis. Accuracy assessments of the proposed method are carried out by utilizing Solov'ev type equilibrium. The results show the validity and high performance of the proposed method.