Design study of the optical system in the port plug for edge Thomson scattering diagnostics for ITER

Kajita, Shin; Hatae, Takaki; Katsunuma, Atsushi*; Kusama, Yoshinori

JAEA-Technology 2007-064, 60 Pages, 2008/01

JAEA-Technology-2007-064.pdf:5.65MB

The design of the collection optics for edge Thomson scattering diagnostics for ITER is provided. Since the neutron and ray radiation fluxes generated by the nuclear fusion reaction are considerably high near the plasma in ITER, available optical components are limited. Near the plasma, namely in the front-end optics, only metal mirrors can be used; moreover, optical fiber may be used only outside the vacuum window, which is located far from the front-end optics. In this design, three metal mirrors are used for the front-end optics, and the light ray is transmitted in the slender port plug through a relay optical system. To compensate the aberrations and increase the coupling efficiency to the fibers, two types of optical system with Catadioptric system are proposed for fiber-coupling optical system. It has been revealed that refraction type and reflection type system are not adequate for the fiber-coupling optical system. The image qualities are discussed based on the spot diagram and so on for the Catadioptric optical system.

Progress in development of edge Thomson scattering system for ITER

Hatae, Takaki; Nakatsuka, Masahiro*; Yoshida, Hidetsugu*; Ebisawa, Katsuyuki*; Kusama, Yoshinori; Sato, Kazuyoshi; Katsunuma, Atsushi*; Kubomura, Hiroyuki*; Shinobu, Katsuya*

Fusion Science and Technology, 51(2T), p.58 - 61, 2007/02

https://doi.org/10.13182/FST07-A1313

no abstracts in English

Divertor impurity monitor for the international thermonuclear experimental reactor

Sugie, Tatsuo; Ogawa, Hiroaki; *; *; Ebisawa, Katsuyuki*; Ando, Toshiro; *; Kasai, Satoshi; Nishitani, Takeo

Review of Scientific Instruments, 70(1), p.351 - 354, 1999/01

https://doi.org/10.1063/1.1149340

no abstracts in English

Divertor impurity monitor for ITER

Sugie, Tatsuo; Ogawa, Hiroaki; *; *; Ebisawa, Katsuyuki*; Ando, Toshiro; *; Kasai, Satoshi

Proc. of Int. Workshop on Diagnostics for Experimental Fusion Reactors, p.327 - 336, 1998/00

no abstracts in English

Present status and future plan of impurity influx monitor (divertor) for ITER

Ogawa, Hiroaki; Sugie, Tatsuo; Katsunuma, Atsushi*; Kasai, Satoshi

no journal, , 

no abstracts in English

Conceptual design of edge Thomson scattering diagnostic system for ITER

Hatae, Takaki; Nakatsuka, Masahiro*; Yoshida, Hidetsugu*; Ebisawa, Katsuyuki*; Katsunuma, Atsushi*; Kusama, Yoshinori

no journal, , 

no abstracts in English

Status and plan of design and R&D for impurity influx monitor (divertor)

Ogawa, Hiroaki; Sugie, Tatsuo; Kasai, Satoshi*; Katsunuma, Atsushi*; Hara, Hirotsugu*; Takeyama, Norihide*; Kusama, Yoshinori

no journal, , 

no abstracts in English

Optical performance verification of the Impurity Influx Monitor (Divertor) for ITER

Iwamae, Atsushi; Ogawa, Hiroaki; Sugie, Tatsuo; Kusama, Yoshinori; Kasai, Satoshi*; Katsunuma, Atsushi*; Takeyama, Norihide*

no journal, , 

We report the performance test of the trial optics of the Impurity Influx Monitor (Divertor) for ITER. The emission from the divertor plasma in UV and visible wavelength region will be collected with the head optics and the Cassegrain telescope. The focused light from the plasma is transmitted by the optical fiber to the spectrometers. Since the head optics is irradiated by the high fluxes of the -ray, neutron and high energy particles from the core plasma, we use molybdenum and aluminum metallic mirrors in the head optics. These mirrors are mounted in a module equipped with cooling channels to remove the nuclear heat. We have built metallic mirrors, a Cassegrain telescope, a micro-lens array and optical fiber light distributors for the optical performance test on an ITER-equivalent geometric scale. We expand the field of view along the magnetic field direction with introducing the micro-lens array in front of the fiber core. The light collection efficiency increased by three times at maximum with the micro-lens array. We have evaluated the line-of-sight integrated intensity of the impurity emission line in the divertor plasma with the collisional-radiative model. The estimated intensity of C IV line (581 nm) will be detectable in several lines of sight with the present designed optical system.

Progress of impurity influx monitor (divertor) for ITER

Ogawa, Hiroaki; Kitazawa, Sin-iti; Sugie, Tatsuo; Katsunuma, Atsushi*; Kitazawa, Daisuke*; Omori, Keisuke*; Itami, Kiyoshi

no journal, , 

no abstracts in English