On the Tore Supra tokamak, a far infrared polarimeter diagnostic has been routinely used for diagnosing the current density by measuring the Faraday rotation angle. A high precision of measurement is needed to correctly reconstruct the current profile. To reach this precision, electronics used to compute the phase and the amplitude of the detected signals must have a good resilience to the noise in the measurement. In this article, the analogue card's response to the noise coming from the detectors and their impact on the Faraday angle measurements are analyzed, and we present numerical methods to calculate the phase and the amplitude. These validations have been done using real signals acquired by Tore Supra and JET experiments. These methods have been developed to be used in real-time in the future numerical cards that will replace the Tore Supra present analogue ones

Brault, C., Gil, C., Boboc, A., Spuig, P., Gorini, G. (2011). Evaluation of the Faraday angle by numerical methods and comparison with the Tore Supra and JET polarimeter electronics. REVIEW OF SCIENTIFIC INSTRUMENTS, 82(4) [10.1063/1.3570621].

Evaluation of the Faraday angle by numerical methods and comparison with the Tore Supra and JET polarimeter electronics

GORINI, GIUSEPPE
2011

Abstract

On the Tore Supra tokamak, a far infrared polarimeter diagnostic has been routinely used for diagnosing the current density by measuring the Faraday rotation angle. A high precision of measurement is needed to correctly reconstruct the current profile. To reach this precision, electronics used to compute the phase and the amplitude of the detected signals must have a good resilience to the noise in the measurement. In this article, the analogue card's response to the noise coming from the detectors and their impact on the Faraday angle measurements are analyzed, and we present numerical methods to calculate the phase and the amplitude. These validations have been done using real signals acquired by Tore Supra and JET experiments. These methods have been developed to be used in real-time in the future numerical cards that will replace the Tore Supra present analogue ones
Articolo in rivista - Articolo scientifico
Faraday rotation
English
2011
82
4
043502
none
Brault, C., Gil, C., Boboc, A., Spuig, P., Gorini, G. (2011). Evaluation of the Faraday angle by numerical methods and comparison with the Tore Supra and JET polarimeter electronics. REVIEW OF SCIENTIFIC INSTRUMENTS, 82(4) [10.1063/1.3570621].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/39187
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