Assessment of the Structural Vibration Effect on Plasma Current Measurement Using a Fiber Optic Current Sensor in ITER

Sung-Moon Kim, Prasadaraju Dandu, Andrei Goussarov, Alessandro Danisi, George Vayakis, Marc Wuilpart

    Research outputpeer-review


    In this paper, we assess the effect of cryostat bridge vibrations on the plasma current measurement accuracy when using a fiber optic current sensor (FOCS) in ITER. The impact of vibrations on the light polarization state was first experimentally investigated using a miniaturized mock-up which represented a relevant part of the ITER FOCS structure. The set-up was then numerically simulated using the Jones matrix approach. Equivalent vibration matrices obtained from the experiment were used in the simulations to determine the effect of the vibrations on the FOCS accuracy. It is demonstrated that although the vibrations imply some changes in the polarization state, this effect can be strongly reduced when a proper low-birefringent spun optical fiber is used. The ITER requirement regarding the plasma current measurement accuracy can therefore be fulfilled.

    Original languageEnglish
    Article number1460
    Number of pages15
    Issue number3
    StatePublished - Feb 2023

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Information Systems
    • Instrumentation
    • Atomic and Molecular Physics, and Optics
    • Electrical and Electronic Engineering
    • Biochemistry

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