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We present the design and the prototype of the Small Synoptic Second SolarSpectrum Telescope (S5T), which can autonomously measure scatteringpolarization signals on a daily basis with large sensitivity and accuracy. Itsdata will be used to investigate the nature of weak, turbulent magnetic fieldsthrough the Hanle effect in many lines. Also the relation between those fieldsand the global solar dynamo can be revealed by spanning the observations over asignificant fraction of a solar cycle. The compact instrument concept isenabled by a radial polarization converter that allows for ``one-shot''polarimetry over the entire limb of the Sun. A polarimetric sensitivity of~10^-5 is achieved by minimizing the instrumental polarization and by FLCmodulation in combination with a fast line-scan camera in the fiber-fedspectrograph. The first prototype results successfully show the feasibility ofthe concept.

The Prototype of the Small Synoptic Second Solar Spectrum Telescope (S5T)