Test of fiber optic based current sensors on the Tore Supra tokamak

Moreau, Ph.; Brichard, B.; Fil, A.; Malard, P.; Pastor, P.; Le-Luyer, A.; Samaille, F.; Massaut, V.

doi:10.1016/j.fusengdes.2010.12.023

Cited by 28 publications

(9 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The possibility to use a FOCS for MA-range plasma current measurement during long pulses was assessed on the Tore Supra tokamak [115]. Promising results have been obtained in terms of linearity with respect to the plasma current and long term stability of the measurements.…”

Section: B Fusion By Magnetic Confinement: Iter Projectmentioning

confidence: 99%

Radiation Effects on Silica-Based Optical Fibers: Recent Advances and Future Challenges

Girard

Kuhnhenn

Gusarov

et al. 2013

IEEE Trans. Nucl. Sci.

Self Cite

405

228

View full text Add to dashboard Cite

International audienceIn this review paper, we present radiation effects on silica-based optical fibers. We first describe the mechanisms inducing microscopic and macroscopic changes under irradiation: radiation-induced attenuation, radiation-induced emission and compaction. We then discuss the influence of various parameters related to the optical fiber, to the harsh environments and to the fiber-based applications on the amplitudes and kinetics of these changes. Then, we focus on advances obtained over the last years. We summarize the main results regarding the fiber vulnerability and hardening to radiative constraints associated with several facilities such as Megajoule class lasers, ITER, LHC, nuclear power plants or with space applications. Based on the experience gained during these projects, we suggest some of the challenges that will have to be overcome in the near future to allow a deeper integration of fibers and fiber-based sensors in radiative environments

show abstract

Section: B Fusion By Magnetic Confinement: Iter Projectmentioning

confidence: 99%

Radiation Effects on Silica-Based Optical Fibers: Recent Advances and Future Challenges

Girard

Kuhnhenn

Gusarov

et al. 2013

IEEE Trans. Nucl. Sci.

Self Cite

405

228

View full text Add to dashboard Cite

show abstract

“…However, these sensors are based on the measurement of the time derivate of a magnetic field, which can induce measurement drift due to the long steady state operation of the ITER since integrators are used to retrieve the plasma current [ 2 , 3 ]. A fiber optic current sensor (FOCS) measures the plasma current by means of the Faraday effect [ 4 , 5 ]. The current flowing inside the fiber loop is determined by measuring the rotation angle of the light polarization state without involving integration.…”

Section: Introductionmentioning

confidence: 99%

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

Kim

Dandu

Gusarov

et al. 2023

Sensors

View full text Add to dashboard Cite

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.

show abstract

“…At a later stage, the use of magnetic sensors other than pick-up coils may be reconsidered, like, e. g., fiber optic based current sensors for a non-integrated measurement of the plasma current [8]. Furthermore, additional Mirnov coils for magnetic fluctuation measurements will probably be used in the heads of probe manipulators penetrating into the scrape-off layer or edge plasma.…”

Section: Introductionmentioning

confidence: 99%

Engineering design for the magnetic diagnostics of Wendelstein 7-X

Endler

Brucker

Bykov

et al. 2015

Fusion Engineering and Design

View full text Add to dashboard Cite

The magnetic diagnostics foreseen for the Wendelstein 7-X (W7-X) stellarator are diamagnetic loops to measure the plasma energy, Rogowski coils to measure the toroidal plasma current, saddle coils to measure the Pfirsch-Schlüter currents, segmented Rogowski coils (poloidal magnetic field probes) to add information on the distribution of the plasma current density, and Mirnov coils to observe magnetohydrodynamic modes. All these magnetic field sensors were designed as classical pick-up coils, after the time integration of induced signals for 1/2 hour had been successfully demonstrated.The long-pulse operation planned for W7-X causes nevertheless significant challenges to the design of these diagnostics, in particular for the components located inside the plasma vessel, which may be exposed to high levels of microwave (electron cyclotron resonance) stray radiation and thermal radiation. This article focuses on the tests and modelling performed during the development of the magnetic diagnostics and on the design solutions adopted to meet the conflicting requirements. * Corresponding author, email: endler@ipp.mpg.de 1 All pick-up coils foreseen for the initial operation phase of W7-X and their signal cable sections inside the plasma vessel and the cryostat are now installed, and their electronics and data acquisition are under preparation.

show abstract

Test of fiber optic based current sensors on the Tore Supra tokamak

Cited by 28 publications

References 5 publications

Radiation Effects on Silica-Based Optical Fibers: Recent Advances and Future Challenges

Radiation Effects on Silica-Based Optical Fibers: Recent Advances and Future Challenges

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

Engineering design for the magnetic diagnostics of Wendelstein 7-X

Contact Info

Product

Resources

About