Infrared and far-infrared lasers for plasma diagnostics.

Abstract

The infrared and far-infrared spectral region is particularly well suited to diagnose the state of magnetically confined fusion plasmas. Interferometers and polarimeters are used to measure electron and current density profiles. Collective scattering techniques are used to probe a variety of turbulent and coherent waves that exist in these plasmas. The density fluctuations associated with these waves may be responsible for the observed anomalous transport in fusion plasmas.The present status of research on the infrared and far-infrared lasers used for these plasma diagnostics is reviewed.