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The architecture and capabilities of free electron laser radiation spectrum measurement system described in details in this paper. For execution of the measurements the monochromator and step-motor with radiation power sensor are used. As the result of the measurements, the curve of spectrum of radiation is transmitted to control computer. As this subsystem is fully integrated to common FEL control system, the results of measurements – spectrum graph, average wavelength, calculated radiation power, are able to transmit to any another computer on FEL control local area network and also on user stations computers.
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