Title :
Analysis of the polarisation rotation of far infrared beams in the Tore Supra plasmas
Author :
Brault, C. ; Gil, C. ; Spuig, P.
Author_Institution :
IRFM, CEA, St. Paul-lez-Durance, France
Abstract :
On Tore Supra, a far infrared interfero-polarimeter diagnostic has been routinely used for diagnosing the electron and current density by measuring the Faraday rotation angle. As this angle is a few dozen of degrees on present plasma fusion devices, a high precision is needed to correctly reconstruct the current profile. In this article we have analysed the way the electronic cards deal with the noisy signal coming from the detectors, and the consequences on the Faraday angle measurement. We have measured the evolution of this noise in the successive stages of the calculation carried out within the electronic cards, and we discuss of the interest of a numerical treatment to increase the precision of the polarisation measurement.
Keywords :
Faraday effect; Tokamak devices; fusion reactor instrumentation; light interferometry; light polarisation; plasma density; plasma diagnostics; plasma light propagation; plasma toroidal confinement; plasma transport processes; polarimetry; Faraday angle measurement; Faraday rotation angle; current density; electron density; far infrared beams; far infrared interferopolarimeter diagnostic; plasma fusion devices; polarisation measurement precision; polarisation rotation analysis; tore supra plasmas; Current density; Density measurement; Electrons; Noise measurement; Particle beams; Plasma density; Plasma devices; Plasma diagnostics; Plasma measurements; Polarization; FIR Polarimeter; Faraday rotation angle; plasma diagnostic;
Conference_Titel :
Advancements in Nuclear Instrumentation Measurement Methods and their Applications (ANIMMA), 2009 First International Conference on
Conference_Location :
Marseille
Print_ISBN :
978-1-4244-5207-1
Electronic_ISBN :
978-1-4244-5208-8
DOI :
10.1109/ANIMMA.2009.5503824
