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Description
In the Shenzhen Superconducting Soft X-Ray FEL project (S3FEL), it is planned to use a fast wire scanner for online measurement of beam transverse dimensions. The repetition frequency of the beam pulse is 1 MHz, the charge of a single bundle is about 100 pC. According to the different installation positions of the fast wire scanner, the bundle length will vary between 5 ps and 50 fs. The scanning wire adopts tungsten filament with a diameter less than 30 μm, and the motor adopts a linear motor with a designed motion speed of 1 m/s. The position feedback would use two grating rulers, one of which is an absolute grating ruler connected to a PLC controller for motion controlment, and the other incremental grating ruler can directly output TTL signals to trigger the signal acquisition electronics. The grating ruler has a resolution of 50 ns and an overall structural accuracy better than 10 μm. Using the wire position of the incremental grating ruler as the x-axis and the plastic scintillator combined with a photomultiplier tube to detect the beam loss signal as the y-axis, the transverse distribution of the beam is reconstructed.
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