Thermal Behaviour and Fatigue Estimation of the Switching Regulator for the BTF Power Supply of DAFNE Injector

The BTF power supply is used to extract from the beam transfer line the particles pulses coming from the LINAC which normally fill the DAFNE collider at Frascati INFN Lab. This new power converter has been designed to feed a bending magnet with 447Â A at nominal conditions and with a total ramp up and down of 20Â ms. This power converter can run either in pulsed mode or in a conventional DC current mode. In pulsed mode the flat top can be streched from 5Â ms up to 960Â ms allowing a multi-pulse extraction. The heart of the system is based on a static converter with an H bridge topology made of IGBTs with integrated free wheel diodes. On one hand this paper presents the analysis of the thermal behaviour, the fatigue estimation and the impact on the power converter life time. On the other hand the design of a forced air cooling system is presented with the final results.