Plasma Current Measurement in Thermonuclear Fusion Reactors Using a Photon-Counting POTDR

Marc Wuilpart, Matthieu Aerssens, Andrei Goussarov, Philippe Moreau, Patrice Mégret

Research outputpeer-review


In this letter, we present a fiber-optic current sensor for the measurement of plasma current in thermonuclear fusion reactors. The sensor includes a low-birefringence optical fiber placed around a section of the vacuum vessel that hosts the fusion reaction. The interrogating unit consists of a polarizationsensitive photon-counting optical time domain reflectometer that enables to determine the light polarization rotation induced by the plasma current. The measurement principle is demonstrated by means of the Jones formalism. The sensor has been experimentally validated on the Tore Supra tokamak fusion reactor for a plasma current range going from 0.6 to 1.5 MA. A maximum error of 13.50% has been observed for the lowest current.
Original languageEnglish
Pages (from-to)547-550
Number of pages40
JournalIEEE Photonics Technology Letters
Issue number6
StatePublished - 27 Mar 2017

Cite this