Pecision voltage regulation on the 5 KHz, 3.125 MW ETA-II pulsed power system

Each of four pulsed power units (PPUs) for the Experimetnal Test Acceleraot II (ETA-II) at Lawrence Livermore National Laboratory delivers a 25 kV, 20 kA, 4/spl mu/S pulse at a 5kHz repetition rate into a pulse compression modulator (MAG-ID). In our present configuration, we are capable of producing a 50 pulse burst using a 1000/spl mu/F capacitor bank. In this configuration, the input voltage to the PPU droops 22% udring the burst. Accelerator operating requirements, however, dictate /spl I.chemo/0.1% regulation of the PPU output voltage during burst. We are employing a de-Qing network to achieve this goal. In this paper, we describe an output voltage predict-ahead scheme that we are using to generate de-Q trigger pulses at the proper time to insure accurate regulation.