Modified ITER in-vessel viewing system

H. Ahola (Corresponding Author), Veli Heikkinen, Kimmo Keränen, J. Suomela

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

The original ITER In-Vessel Viewing System (IVVS) prototype (Proc. of the 20th SOFT, vol. 2 (1998) 1051), which demonstrates the feasibility of linear fibre arrays for ITER in-vessel viewing, has been modified. In order to reduce the viewing time and to improve the image quality the beam dispersing mirrors was replaced by a diffractive optics element (DOE), which enhanced the laser illumination considerably. The performance of the system was tested using various target surfaces: the results obtained clearly indicate its adequacy for in-vessel viewing. Mechanical damage on smooth metal surfaces (scratches etc.) can be easily distinguished and the viewing resolution at a distance of 2 m is better than 1 mm. The IVVS has been re-designed to be compatible with the new ITER-FEAT. A conceptual study which covers all the functions and subsystems required for viewing has been completed. These results will be used to further modify the prototype: items to be tested include horizontal probe operation and laser illumination with an optical fibre.
Original languageEnglish
Pages (from-to)513-516
Number of pages4
JournalFusion Engineering and Design
Volume58-59
DOIs
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

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Lighting
Diffractive optics
Lasers
Image quality
Optical fibers
Fibers
Metals

Cite this

Ahola, H. ; Heikkinen, Veli ; Keränen, Kimmo ; Suomela, J. / Modified ITER in-vessel viewing system. In: Fusion Engineering and Design. 2001 ; Vol. 58-59. pp. 513-516.
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Modified ITER in-vessel viewing system. / Ahola, H. (Corresponding Author); Heikkinen, Veli; Keränen, Kimmo; Suomela, J.

In: Fusion Engineering and Design, Vol. 58-59, 2001, p. 513-516.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Ahola, H.

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AU - Keränen, Kimmo

AU - Suomela, J.

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