NDLI: Accuracy Of The Approximate Expressions For Pure Cotton-Mouton Effect From Jet Real-Time Far Infrared Polarimeter

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Accuracy Of The Approximate Expressions For Pure Cotton-Mouton Effect From Jet Real-Time Far Infrared Polarimeter

Content Provider	Semantic Scholar
Author	Bieg, Bohdan
Copyright Year	2016
Abstract	The JET Far-Infrared (FIR) polarimeter is a laser based instrument used for determining the poloidal magnetic field via the Faraday rotation angle measurements and more recently, for determining the line-integrated electron plasma density (LID) via the Cotton-Mouton ellipticity angle measurements. However, at high plasma current and plasma density the Cotton-Mouton effect combines nonlinearly with the Faraday effect, hampering an accurate determination. There have been several investigations in the last decade dedicated to the subject, but all were carried out for different plasma regimes and conditions. We take a different approach, where different approximations for estimating the line-integrated plasma density by polarimetry are analysed in a wide variety of conditions, representative of the JET operating domain, focusing in particular on pulses with high plasma current, high density and high magnetic field. This new set of data will be compared with the line-integrated measurements obtained by other means, such as interferometry and high resolution Thomson scattering. A complete sensitivity study of the various formulations for LID from polarimetry will be performed to analyse the potential of these formulations for complementing the interferometry measurements with the ultimate goal of providing fringe-jump free LID measurements on JET during future experimental campaigns.
Starting Page	161
Ending Page	161
Page Count	1
File Format	PDF HTM / HTML
DOI	10.22323/1.240.0161
Alternate Webpage(s)	https://pos.sissa.it/240/161/pdf
Alternate Webpage(s)	https://doi.org/10.22323/1.240.0161
Volume Number	240
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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