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Ipimb = Intensity Position, Intensity Monitoring Boards. Devices used by SXR and XPP several of the LCLS endstations/instruments to measure position and intensity of the X-ray beam. It has four diodes situated around the beamline, and the bias voltage of these diodes measures the intensity of the beam at the location of each diode. By comparing the signal from each diode, the position of the beam can be inferred.

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