Network-Controlled High Voltage Power Supply Working in Magnetic Field

International Center for Elementary Particle Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan Faculty of Science, Kobe University, 1-1 Rokko-dai, Nada-ku,Kobe 657, Japan Faculty of Science, Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan National Laboratory for High Energy Physics (KEK) 1-1 Oho, Tsukuba-shi, Ibaraki-ken 305, Japan Abstract : This article describes a network of high voltage power supplies which are controlled and managed through a network. The high voltage power supply incorporates a ceramic transformer which utilizes piezoelectric effect to generate high voltage. The ceramic transformer is constructed from a ceramic bar and does not include any magnetic material. A high voltage power supply can work without a loss of efficiency under a magnetic field of 1.5 tesla. The power supply includes feedback to stabilize the high voltage output, supplying from 2000V to 4000V with a load of more than 10 MΩ at efficiency higher than 60 percent. The high voltage power supply includes a Neuron chip, a programming device processing a variety of input and output capabilities. The chip can also communicate with other Neuron chips over a twisted-pair cable, which allows establishing a high voltage control network consisting of a number of power supplies that incorporate the chip individually. The functions of the power supply under the control of the chip are managed through the network. The chip turns on and off the high voltage power supply and sets the output high voltage. The chip detects the short circuit of the output high voltage and controls its recovery. The chip also monitors the output current. Thus the high voltage power supplies are monitored and controlled through the network.