Abstract
An energy-recovery linac (ERL)-based x-ray free electron laser (X-FEL) combined with a low-loss x-ray optical cavity can produce a high-intensity and fully coherent x-ray beam. The idea is to let the x-ray emission beam in the cavity become the seed beam of the FEL to realize x-ray stimulated emission conditions. Because the electron bunch size in the ERL is sub-micrometer and the x-ray cavity crystals are a few tens of meters away from the electron bunch, a deviation of a few nanoradians in the beam direction can cause the seed beam miss the electron bunches. Therefore, it is necessary to develop a high-precision beam-direction correction device that is independent of the x-ray cavity tuning to ensure collision of the narrow x-ray seed beam and electron bunches. To this end, we have assembled a pair of x-ray prisms on two rotary stages. We operated the device using 1.086 Å wavelength x-rays and demonstrate that the angular resolution can reach 1 nrad within a deviation range of ±3.1 mrad.
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