Speaker
Description
The Photo-Injector Test facility at DESY in Zeuthen (PITZ) is designed to characterize and optimize L-band photo-electron sources. As such, it has many diagnostics and tools available to measure the beam quality close to the gun. To ensure all components near the gun are properly aligned, four pairs of fiducial magnet nests were installed around the gun; approximately 50 cm from the beam axis. It was initially assumed that this distance would be sufficient to keep the magnetic field effects of the beam negligible. However, recent measurements demonstrate that these magnets significantly influence the electron beam dynamics. Comparing measurements with the fiducial magnets in place and removed shows the magnets significantly impact the beam trajectory, the laser’s beam-based alignment on the photo-cathode, and increase the transverse emittance by approximately 30%.
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