F. Nedeoglo, O. Novojilov, S. Dudnikov (Department of Physics, Moscow State University), A. Chepurnov, I. Gribov, V. Shvedunov (Institute for Nuclear Physics, Moscow State University),
Very compact 70 MeV pulse race-track microtron is under construction in our Institute. To acquire outputs of beam-current transformers placed on every orbit distributed multi-channel beam diagnostic system was developed. It is based on set of stand-alone controllers consists from four fast differential amplifiers and one DSP micro-controller core with on-chip ADC and CAN-controller. Each amplifier is coupled with beam-current transformer and has bandwidth up to 150MHz and gain up to 10. One of four channels is acquired during measurement cycle. Another channel could be selected by micro-controller between two following pulses. Data acquisition is synchronized from general accelerator's synchronization system. The same type of controller is used to measure pulses of high voltage and RF field but additional analog input circuits to scale signals and safe inputs are used. All the controllers are connected via CAN-bus running under originally designed CAN application layer. Standard CAN application layers were considered but refused because of closed character of the whole system. Diskless PC running under Linux in combination with real-time extension RTLinux manages the operation of all distributed controllers, acquires measured data and presents its to control system of the accelerator.
Last updated: September 13, 2002
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