A new controlling system for the solar tower telescope of IZMIRAN: I. Guide

A new guiding system for the solar tower telescope is described. Two mutually perpendicular CCD arrays are used as photodetectors. The guide provides a positional error of no larger than 0.2″ in a frequency band of 0–10 Hz. The software allows for referring the spectrograph slit position to solar coordinate systems and provides for various guide operation modes.