| Synchrotron radiation beamline is an important part of the synchrotron radiation facilitywhich is designed to produce synchrotron radiation. It’s composed of different kind of devices,such as double-crystal monochromator, toroidal focusing mirror, fluorescent screens and so on.The function of the beamline is beam transmission, splitting polychromatic light intomonochromatic light and focusing the beam. During the operation of the beamline, we shouldmonitor the beam’s position and measure the size of the beam spot to guarantee the beam meetthe requirements of science experiments. Currently, the position of the beam is measured byblade beam position monitor or wire-scanning beam position monitor. But, the blade beamposition monitor could not show the distribution of the beam spot while the wire-scanning beamposition monitor could not give real-time information. The method used for measuring the spotsize is scanning knife-edge, it’s accurate but time consuming.For the above reasons, we designed a synchrotron radiation beam diagnostic system basedon image processing to measure the position of the beam and the size of the beam spot morequickly. The results show that the new system can get the spot size and the beam’s positioncorrectly although the spot size changes in a large range. What’s more, the new method can showthe oval spot rotation angle and spot symmetry simultaneously.In order to apply the new technique, we try to design an automation alignment system toimprove the beamline operational efficiency. The preliminary design of the system has beencompleted, the image processing program mentioned above has been integrated into the systemas a means of measurement. Automatic scan-data processing has been realized in the System.Moreover, theoretical calculations about the relation between the positon of the beam and theposition of toroidal focusing mirror has been carried out to provide theoretical support for theautomatically alignment of the toroidal focusing mirror. |
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