Minicomputer Assisted Function Generator for the Dynamic Control of Chromaticity Correction Sextupoles

A signal obtained from a function generator is fed to the power supply of the correction sextupole magnets which are used to compensate the chromaticity of the KEK-PS main ring up to flat-top. Main system consists of a minicomputer which generates a set of the digital data forming a function according to the input data. The desired current wave form is approximated by the successive small line segments. The function can be easily changed from the operator console placed in the central control room.