Preliminary Thermal Analysis of Critical Components in ITER Lower Port #02

Maruyama, Toshiyuki; Kitazawa, Sin‐iti; Ogawa, Hideyuki; Itami, K.

doi:10.1585/pfr.11.2405083

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…This diagnostic system has been designed and developed by Japan domestic agency. Design of optics [3,4], heat analysis [5,6], failure mode analysis [7], and stray light analysis [8,9] have been conducted.…”

Section: Introductionmentioning

confidence: 99%

Performance of first mirrors for divertor impurity monitor in ITER: compensation of misalignment and effect of beam divergence

Kajita¹,

Ogawa²,

Kitazawa³

et al. 2020

J. Inst.

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We investigated feasibility of an alignment method using first mirrors of the divertor impurity monitor (DIM) in ITER based on ray tracing analysis. A misalignment could occur between the divertor cassette and measurement system. It is shown that the misalignment can be compensated to some extent by rotating the first mirror. The maximum compensable misalignment and the required accuracy in the alignment are discussed. It is likely that the surface roughness of the first mirrors gradually increases during ITER operation. We investigated the required quality of the first mirror as focusing on the beam divergence using the ray tracing model. Moreover, to check the performance, helium plasma irradiation was performed on molybdenum mirror samples, and the beam divergence was measured using a laser and a detector. Based on the simulations and experiments, it is shown that the helium effect does not harm the performance of the mirror when the mirror temperature is less than 800 K.

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Section: Introductionmentioning

confidence: 99%

Performance of first mirrors for divertor impurity monitor in ITER: compensation of misalignment and effect of beam divergence

Kajita¹,

Ogawa²,

Kitazawa³

et al. 2020

J. Inst.

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“…In the previauthor's e-mail: t-maruyama@toyama-jp.com * ) This article is based on the presentation at the 27th International Toki Conference (ITC27) & the 13th Asia Pacific Plasma Theory Conference (APPTC2018). ous work [3], the thermal structure of a box-shaped optics, named mirror box, on the divertor cassette was developed and its structural feasibility against high thermal loads was c 2019 The Japan Society of Plasma investigated. However, other mechanical loads (electromagnetic and seismic loads, etc.)…”

Section: Introductionmentioning

confidence: 99%

Mechanical Design and Structural Analysis for Lower Port Optics of ITER Divertor Impurity Monitor

Maruyama

Oikawa

Kitazawa

et al. 2019

Plasma and Fusion Research

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The Divertor Impurity Monitor (DIM) for ITER is a spectroscopic diagnostic that measures the parameters of impurities and isotopes of hydrogen in the divertor plasmas. The DIM systems are installed in upper port, equatorial port, lower port (LP) and the divertor cassette. The LP systems consist of the side-upper/lower optical systems and the central optical system. In the central system, the front-end optics (optical mirrors) are located under the divertor-dome and this optics is required to have a structure that can withstand extremely high thermal loads in terms of establishing a sensitive optical structure. This paper presents a mechanical design of the optics with taking manufacturability into account and structural integrity assessment according to ITER load conditions (thermal and electromagnetic loads, etc.) and design criteria specified in the RCC-MR code. The mechanical design of the optics forms a box-shaped optics and the structural analysis results indicate the mirror box satisfies design criteria in the RCC-MR code, except for the inner support part interfacing with the divertor cassette.

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Preliminary Thermal Analysis of Critical Components in ITER Lower Port #02

Cited by 2 publications

References 7 publications

Performance of first mirrors for divertor impurity monitor in ITER: compensation of misalignment and effect of beam divergence

Performance of first mirrors for divertor impurity monitor in ITER: compensation of misalignment and effect of beam divergence

Mechanical Design and Structural Analysis for Lower Port Optics of ITER Divertor Impurity Monitor

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