Modelling of the signal processing electronics of JET interferometer-polarimeter

The present electronics of JET Far Infrared polarimeter was commissioned in 2002. Due to the fact that in the last years the diagnostic has been configured to measure routinely both the Faraday Rotation angle and the Cotton-Mouton angle with a different optical set-up, it becomes important to check the performance of the analog phase sensitive electronics that is the core of the polarimeter. Therefore a simulator for the JET FIR polarimeter analog electronics has been developed with Simulink and with Matlab in order to completely characterize its behaviour, assess its performance and determine its impact on the absolute calibration of the diagnostic. The presented results indicate the electronic devices are working within their design specifications.