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A tilted spinning mirror rapidly steers the line of sight of the electronBernstein wave (EBW) emission radiometer at the Mega Amp Spherical Tokamak(MAST). In order to resist high mechanical stresses at rotation speeds of up to12,000 rpm and to avoid eddy current induced magnetic braking, the mirrorconsists of a glass-reinforced nylon substrate of a special self-balanceddesign, coated with a reflecting layer. By completing an angular scan every2.5-10ms, it allows one to characterize with good time resolution theBernstein-extraordinary-ordinary mode-conversion efficiency as a function ofthe view angles. Angular maps of conversion efficiency are directly related tothe magnetic pitch angle at the cutoff layer for the ordinary mode. Hence,measurements at various frequencies provide the safety factor profile at theplasma edge. Initial measurements and indications of the feasibility of thediagnostic are presented. Moreover, angular scans indicate the best launchconditions for EBW heating.

A Spinning Mirror for Fast Angular Scans of EBW Emission for Magnetic Pitch Profile Measurement