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The physical diagram shows how the electron passage produces infrared beams that are split, filtered, and converted to a voltage by means of a pyroelectric detector plus amplifier. The existence of 2 detectors is for redundancy, in case one fails. The infrared mirror can be moved out from the electron way, what causes the impossibility to measure the bunch length.

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The mirror and 4 filters can be moved out from the beam or in front of the beam with pneumatic electric actuators. Each of these 5 elements has a sensor for the IN or OUT position. The diagram shows how the control elements are connected to industrial pack modules responsible for digital input and output signals.

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