Assessment of the environmental effects on the ITER FOCS operating in reflective scheme with Faraday mirror

Research output: Contribution to journalArticle

Authors

Institutes & Expert groups

  • UMons - University of Mons-Hainaut

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Abstract

Plasma current measurements will play an important role in ITER to provide real-time plasma control and machine protection. Performance of standard electromagnetic sensors may be not sufficient to fulfill this task due to a combined effect of steady-state operation and the presence of strong nuclear radiation. The Fiber Optics Current Sensor (FOCS) is a back-up system included in the ITER design. Faraday mirror (FM) can be a part of the FOCS, which allows to improve the system performance. It is required that the polarization rotation angle is equal to 90° with acceptable deviations below 0.3°. We have experimentally investigated the effect of thermal perturbations and gamma-radiation on the rotation angle of commercial FMs. The FM rotation thermal sensitivity was found to be in a range 0.105 – 0.124°/°C. Gamma-irradiation resulted in a 1.2° change, saturated after a 12.5 kGy dose. Based on these results we conclude that the cubical area is the preferable location for the FM
despite that implies placing additional link fibers to reach the ITER vacuum Vessel.

Details

Original languageEnglish
Pages (from-to)805-808
Number of pages4
JournalFusion Engineering & Design
Volume146
Issue numberA
DOIs
Publication statusPublished - 1 Sep 2019

Keywords

  • ITER, Radiation effects, Magnetic diagnostics, Plasma current measurements, Fiber optics current sensor, Faraday mirror

ID: 6743293