Speaker
Description
The set of X-ray Beam Position Monitors (XBPMs) at SIRIUS, the Brazilian Synchrotron Light Laboratory (LNLS), is not yet fully operational due to ongoing calibration challenges. These SIRIUS XBPMs employ a blade-type design, which exhibits a linear response only in its central region. Minor asymmetries in device construction and variations in individual blade gains can amplify distortions in the calculated beam position derived from the photocurrents generated by X-ray incidence.
Standard correction methods involve applying a linear transformation to the signals, calibrated by analyzing blade behavior along central-symmetry lines. To enhance accuracy, we have extended these corrections by optimizing the transformation matrix using a simulated annealing algorithm. Furthermore, to deepen our understanding of the relationship between incident X-ray distribution and blade geometry, we developed a simulation algorithm. This tool models the blades' response to radiation, calculating the apparent beam position for various configurations of blade angles, inter-blade distances, and electronic gains. The simulation accepts a range of input beam profiles—including two-dimensional Gaussian distributions or outputs from radiation transport simulators—and can apply transformations such as stretching and rotation to these profiles.
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