KAOS applications and community use
KAOS at FERMIAt FERMI, KAOS serves the DiProI, LDM and MagneDyn beamlines. It allows the FEL beam delivered by PADReS to be matched to the actual sample position, interaction volume and fluence requested by the experiment. The active design allows operators to tune the focus for different wavelengths, source conditions and experimental layouts. The system has been used throughout commissioning, dedicated optics measurements and external user experiments. It is therefore not only a focusing device, but also a reproducible operational platform for delivering a characterized FEL beam. |
Community use
Where KAOS is used
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Beamline roles
DiProIKAOS enables small, high-fluence focal spots for coherent diffraction imaging, projection imaging and single-shot experiments requiring precise knowledge of the beam profile at the sample. |
LDMAt LDM, KAOS focuses the FEL beam for gas-phase, cluster and low-density-matter experiments, where the beam size and fluence must be matched to the interaction volume. |
MagneDynAt MagneDyn, KAOS provides active refocusing for magneto-dynamical studies, where the soft X-ray beam must be accurately delivered to the sample position. |
FLASH2The transfer of KAOS to FLASH2 demonstrated that the PADReS-developed concept can operate beyond FERMI. The installation at DESY confirmed the broader relevance of the system for EUV/soft X-ray FEL beamlines requiring active focusing and wavefront control. |
Scientific impact
KAOS supports experiments that require a stable and well-characterized focus, including coherent imaging, non-linear light-matter interaction, gas-phase and cluster studies, magnetic dynamics and experiments where the photon fluence must be adapted without losing beam quality. Its versatility is particularly important at seeded FELs, where the beam quality can be exploited only if the transport and focusing optics preserve and characterize the wavefront delivered to the sample.
