Speaker
Description
We report on an experimental investigation into the relationship between undulator reverse tapering and resonance detuning. To eliminate the influence of SASE stochasticity in photon energy and isolate the fundamental scaling laws, measurements were performed at the European XFEL using the Hard X-ray Self-Seeding (HXRSS) mode.
To ensure operation within the linear regime, a modulator–radiator configuration comprising seven undulator segments after the crystal was employed. We systematically scanned the taper and $K$ values of the six undulators downstream of the crystal while keeping the seventh segment fixed as the radiator. We analyzed the results for both detuning and reverse tapering with the radiator enabled (to characterize the bunching-dominated regime) and disabled (to characterize background suppression).
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