The 200-MeV Electron-Positron Storage Ring Magnet Power Supply

Two 250 V-100 kW amplidynes are controlled to give a precise output current. The load consists of the series connected bending and quadrupole magnets for the 200-MeV storage ring. This load has an inductance of 0.46 H and a dc resistance of 0.8¿. The magnet current is composed of dc and a triangular-shaped component at a frequency of 3 Hz. This frequency is an order of magnitude higher than the break frequency of the magnet load. The control elements act as an integrator, a summing amplifier, and a differentiator on the error signal and as a differentiator on the reference input. A gain change takes place during the cycle to compensate for saturation of the amplidyne. An electrical analog was used to determine the best range of values for the various control elements. The amplidyne drive is a high slip induction motor that also serves the purpose of smoothing out the electrical load on the power line.