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- W2560001510 abstract "In order to determine the transverse LCLS beam position from the signals induced by the beam in four stripline pickup electrodes, the BPM electronics have to process four concurrent short RF bursts with a dynamic range > 60 dB. An analog front end conditions the signals for subsequent acquisition with a waveform digitizer and also provides a calibration tone that can be injected into the system in order to compensate for gain variations and drift. Timing of the calibration pulser and switches, as well as control of various programmable attenuators, is provided by an FPGA. Because no COTS waveform digitizer with the desired performance (> 14 bit, ≥ 119 MSPS) was available, the PAD digitizer (see separate contribution [1]) was selected. It turned out that the combination of a waveform digitizer with a low-end embedded CPU running a real-time OS (RTEMS [4]) and control system (EPICS [3]) is extremely flexible and could very easily be customized for our application. However, in order to meet the BPM real-time needs (readings in < 1 ms), a second Ethernet interface was added to the PAD so that waveforms can be shipped, circumventing the ordinary TCP/IP stack, on a dedicated link." @default.
- W2560001510 created "2016-12-16" @default.
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- W2560001510 date "2007-01-01" @default.
- W2560001510 modified "2023-09-26" @default.
- W2560001510 title "LCLS BEAM-POSITION MONITOR DATA ACQUISITION SYSTEM" @default.
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