The realization of the power converters for the CERN RF system of LEP

For feeding the LEP (Large Electron-Positron Collider) klystrons, a series of 10 DC power converters was built according to the CERN design of a 100 kV, 4 MW pre-series unit. The power converters are fully voltage-regulated and are capable of regularly withstanding short circuits on their outputs as a normal operation mode. The prototype realization, the series production, the commissioning on the LEP site, and the first operational results of the power converters are presented. The first operational results have demonstrated the validity of the design and construction. The feeding of two klystrons by one power converter was done at a particularly reasonable cost per unit of about k$ 480. The reliability obtained gives confidence for the long-term operation