Speaker
Description
At the insertion device beamline in SPring-8, a photoelectron emission X-ray beam position monitor that utilizes four tungsten-blade detectors is currently in operation. The horizontal and vertical position sensitivity coefficients (gains) are determined by analyzing the output signals of the four detectors as the monitor body is translated horizontally or vertically, respectively, from the reference position. In general, these responses exhibit a slight coupling between the horizontal and vertical directions, attributable to radiation from the leaky magnetic field at the edge of the bending magnet. This coupling becomes more pronounced as the distance between detector elements increases. Therefore, we propose a simple gain calibration method that decouples the X and Y responses. Specifically, we devised a 2×2 matrix formulation that achieves accurate mapping in practical applications by measuring only four points (top, bottom, left, and right). In this report, we introduce the transformation matrix formula and present an actual application example of gain calibration with decoupled X-Y couplings.
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