Arbitrary waveform generator for electrostatic dipoles in a heavy ion recirculator

The Lawrence Berkeley National Laboratory is working in close collaboration with the Lawrence Livermore National Laboratory in the investigation of using a recirculating induction accelerator as a driver for Heavy Ion Fusion. The deflection dipoles in the recirculator require precise high voltage electrical waveforms. These waveforms are of a parabolic shape and rise to a peak voltage level of 28 kV in 240 /spl mu/s. A voltage reference is generated internally which is completely adjustable through the computer. The voltage reference is compared to the output voltage and the error signal drives a pulse width modulator carrier frequency of 100 kHz. The high frequency carrier is stepped up with five stages of ferrite transformers, rectifiers and filters to generate a completely adjustable waveform of up to 28 kV which follows the computer generated voltage reference.