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)


    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
    Publication statusPublished - 2001
    MoE publication typeA1 Journal article-refereed


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