Journal ArticleDOI
Plasma polarimetry for large Cotton–Mouton and Faraday effects
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TLDR
In this article, a formalism for treating plasma polarimetry when both the Cotton-Mouton and the Faraday effects are large is presented, where up to nine parameters related to the plasma can be determined, instead of the usual single Faraday rotation.Abstract:
A formalism is presented for treating plasma polarimetry when both the Cotton–Mouton and the Faraday effects are large. For this general case it is shown that, for each measuring chord, up to nine parameters related to the plasma can be determined, instead of the usual single Faraday rotation. These parameters can be measured by a convenient modulation of the polarization state of the input radiation, and they can be used in the reconstruction of the magnetohydrodynamic equilibrium. Thus, the potential of the polarimetric diagnostic can be significantly increased, and the range of plasma conditions where the latter can be used, is extended. The importance of refraction is discussed.read more
Citations
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Journal ArticleDOI
Heterodyne methods in millimetre wave plasma diagnostics with applications to ECE, interferometry and reflectometry
TL;DR: In this paper, the basic principles of heterodyne techniques are introduced and various components of a heterogeneous system are summarized, and the diagnostic applications in ECE, interferometry and reflectometry are discussed after introducing the diagnostic principles.
Journal ArticleDOI
A review of plasma polarimetry—theory and methods
TL;DR: In this paper, a review of plasma polarimetry is presented, where exact analytic solutions of the evolution equation for polarization are presented, as well as approximate analytic solutions for polarization, and the design of experiments is considered taking into account the maximum amount of information which can be obtained from polarimetric measurements.
Journal ArticleDOI
Poloidal polarimeter for current density measurements in ITER
A. J. H. Donné,M. F. Graswinckel,M. Cavinato,Leonardo Giudicotti,Enrico Zilli,C. Gil,H. R. Koslowski,Patrick J. McCarthy,C. Nyhan,S. L. Prunty,M. Spillane,Chris Walker +11 more
TL;DR: In this article, the authors present the status of the on-going work and address issues as sensitivity and accuracy, refraction, Gaussian beam ray-tracing, alignment, and calibration as well as some specific design details.
Journal ArticleDOI
Diagnostics for steady state plasmas
TL;DR: In this article, problems arising from high power ECRH under conditions of incomplete absorption are discussed, and individual standard diagnostic systems are discussed to identify their specific problems as well as the opportunities connected with long pulse operation.
Journal ArticleDOI
Approximate method to extract the pure Faraday and Cotton?Mouton effects from polarimetry measurements in a tokamak
TL;DR: In this article, a new formalism has been developed, which delivers narrow limits to these quantities in terms of analytic formulae that contain nothing but the input and output polarization parameters, which is valid for vertical lines of sight in toroidal devices whose toroidal field dominates over other field components perpendicular to the line of sight.
References
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Book
Principles of Optics
TL;DR: In this paper, the authors discuss various topics about optics, such as geometrical theories, image forming instruments, and optics of metals and crystals, including interference, interferometers, and diffraction.
Principles of Optics
TL;DR: In this article, the authors discuss various topics about optics, such as geometrical theories, image forming instruments, and optics of metals and crystals, including interference, interferometers, and diffraction.
Journal ArticleDOI
Tokamak equilibrium reconstruction using Faraday rotation measurements
F. Hofmann,G. Tonetti +1 more
TL;DR: In this paper, a new equilibrium reconstruction procedure using magnetic, line integrated electron density and Faraday rotation measurements has been developed, which allows source functions with up to six independent parameters to be reconstructed.
Journal ArticleDOI
The optical polarization of the Sun measured at a sensitivity of parts in ten million
TL;DR: In this paper, the authors reported measurements of the general polarization of the Sun, both linear and circular, over the whole disk and over large sectors, at an absolute sensitivity level of ≲3×10−7, carried out during August-September 1986.
Journal ArticleDOI
Current distribution measurement in a tokamak by FIR polarimetry (invited)
TL;DR: The poloidal magnetic field distribution in a tokamak can be determined by probing the plasma with an array of FIR laser beams perpendicular to BT and measuring the Faraday rotation ψ of their plane of polarization as mentioned in this paper.
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