Speaker
Description
A new generation of normal-conducting 1½-cell L-band RF photoguns (Gun5) has been developed at DESY for long-pulse operation at the European XFEL. Compared to the previous generation (Gun4), Gun5 supports RF pulses up to 1 ms at 10 Hz while maintaining an accelerating gradient of 60 MV/m at the cathode (~70 kW average RF power in the gun cavity). Key design improvements include an elliptical cavity geometry with increased shunt impedance, enhanced distributed water cooling for mitigation of pulsed RF heating, and two RF pickups in the full cell enabling direct field control for improved amplitude and phase stability. RF asymmetries are reduced by a dual-sided power coupler feeding a coaxial antenna. Three Gun5 cavities have been commissioned at PITZ, with one currently in operation at the European XFEL. Results on conditioning, dark current, and beam emittance at 250 pC, together with operational experience, are presented.
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