Interferometry is the commonly exploited technique for electron density measure-ments in magnetically confined fusion plasma experiments. Reliable electron density measure-ments are fundamental both for machine protection and for plasma physics understanding. In the last years, attention was drawn on the dispersion interferometer concept, because of its robust-ness and simplicity. Nevertheless, the heterodyne version of this configuration, which has several advantages over the homodyne scheme, loses one of the main benefits of the dispersion interfer-ometer technique, that is its inherent insensitivity to vibration errors. In this paper, two methods are proposed and theoretically investigated to reduce the vibration noise in the electron density measurements performed with heterodyne dispersion interferometers.
Feasibility study of an enhanced heterodyne dispersion interferometer
Fassina, A.;La Matina, M.
2023
Abstract
Interferometry is the commonly exploited technique for electron density measure-ments in magnetically confined fusion plasma experiments. Reliable electron density measure-ments are fundamental both for machine protection and for plasma physics understanding. In the last years, attention was drawn on the dispersion interferometer concept, because of its robust-ness and simplicity. Nevertheless, the heterodyne version of this configuration, which has several advantages over the homodyne scheme, loses one of the main benefits of the dispersion interfer-ometer technique, that is its inherent insensitivity to vibration errors. In this paper, two methods are proposed and theoretically investigated to reduce the vibration noise in the electron density measurements performed with heterodyne dispersion interferometers.
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