Speaker
Description
Characterization and optimization of the transverse phase space is crucial for the performance of photoinjectors. To this end, many measurements of the transverse phase spaces are taken. Often, the x and y 2D phase spaces are measured separately because they are assumed to be primarily uncoupled. However, there will be some 4D coupling due to solenoid fields, asymmetries in the beamline, or higher multipole moments in the focusing elements. To measure this coupling, a Virtual Pepper Pot (VPP) method was previously developed at the Photo-Injector Test facility at DESY Zeuthen (PITZ) that combines measurements taken with a slit-screen emittance scanner of the x and y 2D phase spaces to reconstruct the full 4D phase space distribution. Presented here are measurements from PITZ using the VPP method to characterize a new photo-gun installed at the end of 2024 including a newly designed symmetric RF coupler with a focus on quantifying and mitigating the x-y coupling.
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