X-ray beam position monitor using a quadrant PIN diode

Abstract We report on the use of a quadrant PIN silicon photodiode as a position monitor of the monochromatized X-ray beam in a synchrotron radiation beamline. Signal levels corresponding to the horizontal and vertical beam positions and to the total intensity intercepted are derived simultaneously. The detector is demonstrated to be quite sensitive to the angular and translational motion of the X-ray beam arising from movement of beamline optical components. Use of the detector to obtain diagnostic information and as a position sensor in feedback loops is discussed.

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