Speaker
Description
The controlled generation of temporally structured X-ray pulse pairs is a central requirement for ultrafast experiments and advanced coherence-based techniques such as X-ray photon correlation spectroscopy (XPCS). We present an experimental demonstration of twin pulses at EuXFEL in the nanosecond delay regime using a dual–injector-laser scheme with electron pulses in seperate RF buckets. By selectively shaping the electron-beam phase space at the injector with two temporally separated drive-laser pulses, we generate two distinct electron bunches that produce reproducible twin SASE pulses with tunable temporal separation. Additionally, we demonstrate the successful formation of twin hard X-ray self-seeding (HXRSS) pulses, offering improved spectral purity and stability critical for high-sensitivity XPCS measurements.
These results open a path toward flexible multicolor and multi-pulse XFEL operation modes. We also discuss ongoing efforts to further increase stability of those pulses and a possible way towards phase locked twin-pulses with fs level time separation.
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