Original title: The Otdr Detector Noise Effect Of The Plasma Current Detection In Tokamak-Type Fusion Reactors
Authors: Motuz, Rastislav
Document type: Papers
Language: eng
Publisher: Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií
Abstract: This paper presents a theoretical analysis dealing with the plasma current measurement in tokamaks. A Polarization Optical Time-Domain Reflectometer (POTDR) setup was used, where the general case of non-uniform magnetic field distribution along the sensing fibre takes place. As a sensing medium, a low birefringent fibre has been chosen. The work is based on the numerical simulations in therms of the Jones formalism and takes into account the OTDR detector noise reflecting the measurement error as a function of the plasma current. The measurement performance is evaluated for an ITER-relevant sensor configuration. Simulation results reveal that for plasma currents from the range of 0 to 1 MA, the signal-to-noise ratio (SNR) of 6 dB complies with the ITER requirements. Subsequently, the SNR level of 4 dB satisfies the plasma current range of 1 to 20 MA. The SNR level of 6 dB is achievable in modern POTDRs.
Keywords: backscattering; noise; plasma current; POTDR; Rayleigh scattering; SNR
Host item entry: Proceedings of the 25st Conference STUDENT EEICT 2019, ISBN 978-80-214-5735-5

Institution: Brno University of Technology (web)
Document availability information: Fulltext is available in the Brno University of Technology Digital Library.
Original record: http://hdl.handle.net/11012/186765

Permalink: http://www.nusl.cz/ntk/nusl-414667


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