Publication result detail

Theoretical assessment of the OTDR detector noise on plasma current measurement in tokamaks

MOTÚZ, R.; LEYSEN, W.; MOREAU, P.; GUSAROV, A.; DREXLER, P.; WUILPART, M.

Original Title

Theoretical assessment of the OTDR detector noise on plasma current measurement in tokamaks

English Title

Theoretical assessment of the OTDR detector noise on plasma current measurement in tokamaks

Type

WoS Article

Original Abstract

In this paper, we propose a theoretical study dedicated to the assessment of plasma current measurement in magnetic confinement fusion reactors using a Polarization Optical Time-Domain Reflectometer (POTDR) setup with a low-birefringent fibre is used as the sensing fibre. We consider the general case of a non-uniform magnetic field distribution along the sensing fibre. The numerical simulations, based on Jones formalism with taking into account the OTDR noise, provide the measurement error as a function of the plasma current. The measurement performance is evaluated for an ITER-relevant sensor configuration. We demonstrate that a signal-to-noise ratio of 6 dB, achievable in modern POTDRs, allows to comply with the ITER requirements for plasma currents from 0 to 1 MA, while for the 1 to 20 MA range the level is relaxed to 4 dB.

English abstract

In this paper, we propose a theoretical study dedicated to the assessment of plasma current measurement in magnetic confinement fusion reactors using a Polarization Optical Time-Domain Reflectometer (POTDR) setup with a low-birefringent fibre is used as the sensing fibre. We consider the general case of a non-uniform magnetic field distribution along the sensing fibre. The numerical simulations, based on Jones formalism with taking into account the OTDR noise, provide the measurement error as a function of the plasma current. The measurement performance is evaluated for an ITER-relevant sensor configuration. We demonstrate that a signal-to-noise ratio of 6 dB, achievable in modern POTDRs, allows to comply with the ITER requirements for plasma currents from 0 to 1 MA, while for the 1 to 20 MA range the level is relaxed to 4 dB.

Keywords

plasma current measurement; POTDR; detector noise; Rayleigh backscattering; sensor

Key words in English

plasma current measurement; POTDR; detector noise; Rayleigh backscattering; sensor

Authors

MOTÚZ, R.; LEYSEN, W.; MOREAU, P.; GUSAROV, A.; DREXLER, P.; WUILPART, M.

RIV year

2019

Released

01.04.2019

Publisher

OSA Publishing

Location

USA

ISBN

2155-3165

Periodical

APPLIED OPTICS

Volume

58

Number

11

State

United States of America

Pages from

2795

Pages to

2802

Pages count

8

URL

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-58-11-2795

BibTex

@article{BUT156342,
  author="Rastislav {Motúz} and Willem {Leysen} and Philippe {Moreau} and Andrei {Gusarov} and Petr {Drexler} and Marc {Wuilpart}",
  title="Theoretical assessment of the OTDR detector noise on plasma current measurement in tokamaks",
  journal="APPLIED OPTICS",
  year="2019",
  volume="58",
  number="11",
  pages="2795--2802",
  doi="10.1364/AO.58.002795",
  issn="1559-128X",
  url="https://www.osapublishing.org/ao/abstract.cfm?uri=ao-58-11-2795"
}