The pulsed power converters of the beam transfer lines at DAPHNE/INFL-LNF

DAPHNE, the phi-factory 510 MeV electron/positron (e±) collider at LNF (Laboratori Nazionali di Frascati), consists of a full energy linac, an accumulator ring (AR) and two storage rings (SRs). The tr ansfer line (TL) conveys the beams from the linac to the AR and thence to the SRs. The TL includes three pulsed magnets. One of them is excited by a special ± 650 A, 55 kW power supply with resonant f ast current polarity inversion within 30 ms. The other two are fed by capacitor discharge power supplies, providing half-sine current pulses of ± 650 A / 30 ms and ± 230 A peak / 20 ms duration. The T L operation and the pulsed magnets are briefly described. The design and topology of the power supplies are presented. Some current and voltage waveforms illustrate the functioning of this already ins talled and fully operational equipment.