Push-Pull Amplifier For Ma-Loaded Cavity

A push-pull amplifier with two tetrodes, 4CW30,000A, is used to drive a MA(Magnetic Alloy)-loaded cavity[1]. The amplifier generates an accelerating voltage of 40kV for the barrier-bucket experiment[2] planed at the Brookhaven National Laboratory. For this purpose, it is suitable that the cavity has a broad band impedance and the amplifier also has a wide band width more than 8MHz, although it will be operated around 2MHz of the fundamental RF frequency. 1 INTRODUCTION With respect to the accelerating voltage for the barrierbucket experiment, requirements are as follows: it is to develop up to about 10kV at the accelerating gap of a cell where the MA-loaded cavity is composed of 4 cells; and it is an isolated sine-wave which should be less distorted; and it has a frequency of 2MHz and repetition rate of 357kHz. In order to meet the requirements, a push-pull amplifier in class B has been designed and tested; and the the impedance including the cavity and the plate circuits of the ampl..