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Investigation on an anomalous behavior of the polarimetric measurements at JET
Zilli, E. ...
The far-infrared polarimeter at JET is affected by an anomaly that makes difficult the interpretation of both Faraday and Cotton-Mouton effect measurements. The anomaly is clearly displayed during ...calibration operations in the absence of plasmaČ As the polarization of the probing beam is rotated, the phase shift of the polarimetric signal with respect to the interferometricsignal is not constant, as expected, and changes significantly.It affects all the polarimetric measurement channels and has so far been removed by an empirical preprocessing of the raw data. It can be ascribed to a nonideal behavior of some optical components. Looking for a possible explanation of the anomaly, in this paper, we analyze the optical setup of the JET polari-interferometer according to the laws of classical polarization optics. At first, the optical characteristics of the recombination plates are analyzed in detail. Although they produce ellipticityin the transmitted and reflected beams, the results show that the recombination plates should not be responsible of the anomaly of the polarimeter. Then, the dielectric waveguides used to transfer the recombined beams from the torus hall to the detectors are, for the first time, consideredas a possible origin of the anomaly. The anomalous behavior is expected to be mainly originated by reflections on metal mirrors, which may produce rotations of the polarization of the beams. A calculation has been performed in order to analyze the effects of a rotation of the polarization ofthe recombined beam on the detector signals. As a result, a rotation of the polarization along the line could explain the anomaly. We also suggest some simple and feasible tests, which are useful to give an experimental support tothis conclusion, and discuss possible modifications of the optical setup to remove or greatly reduce the anomaly in future measurements.
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