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European XFEL is an international non-profit company located in the Hamburg area in Germany. It operates a 3.4 km-long X-ray laser, which produces X-rays of unique quality for studies in physics, chemistry, the life sciences, materials research and other disciplines. The diverse scientific facilities at European XFEL enable scientists from across the globe to carry out a wide range of experimental techniques. Recent advances at the European XFEL have enabled lasing in a cavity-based X-ray free-electron laser oscillator (XFELO). Thismmilestone opens new perspectives for X-ray generation and high-precision experiments. To advance the XFELO program to the next level, we are seeking a highly motivated Postdoctoral Researcher to support a joint team of scientists and engineers from European XFEL and DESY.

For our X-Ray Optics group we are looking for an The Position Further develop, optimize, and operate the existing XFELO demonstrator setup (hardware, beamline components, and experimental procedures). Contribute to the conceptual design of a tunable XFELO device, including performance studies, technical trade-offs, and interface definitions. Plan, prepare, and execute XFELO-related experiments - both internal measurements and experiments in collaboration with internal and external user groups. Analyze experimental data, document results, and contribute to publications, internal reports, and technical notes. Co-organize and support workshops and meetings related to XFELO science, technology, and future development (agenda, speakers, documentation, follow-up actions).

Requirements PhD in Physics, Accelerator/Photon Science, Engineering, or a closely related field (completed by the start date). Demonstrated ability to conduct and publish high-quality research (e.g., peer-reviewed publications, conference contributions). Hands-on experience in at least one of the following areas: free-electron lasers (FELs), optical cavities/oscillators, X-ray optics, accelerator or beam diagnostics, beamline instrumentation, or experimental operation at a large-scale user facility. Solid understanding of X-ray optics and fundamentals of FEL and accelerator physics relevant to XFELO operation. Strong data analysis and scientific programming skills (e.g., Python; MATLAB and/or C/C++ are an advantage). Excellent communication skills in English (written and spoken) and the ability to work effectively in an interdisciplinary, international team.

For additional information, please contact Maurizio Vannoni (). Working place will be Schenefeld, in the Hamburg metropolitan area. General information on working in Germany, the Hamburg area and the European XFEL can be found on our . Our offer Become part of a vibrant international and multi-cultural team of scientists, engineers, technical and administrative staff. Be involved in cutting edge scientific and technical progress and participate in our international networks. Experience our atmosphere of tolerance and respect.

Work-life balance & flexibility A family-friendly working environment (e.g. additional childcare days) Flexible working hours and options to work from home (depending on your role and tasks) 30 days of paid vacation, plus December 24th and 31st off (granted by the employer) Compensation & long-term security Transparent compensation aligned with public service organizations in Germany min. PG 13/1 with 4,901.70€ - max. PG 13/6 with 7,025.87€, the actual level is defined by the individual work experience, here is the link to the current valid In addition, a scientific allowance is granted Depending on the pay group, we offer an annual special payment of 75-95% of one month’s salary.

Partially funded public transportation Deutschlandticket Generous company pension scheme (6.45% of your monthly salary) Support from day one Extensive relocation benefits to help you settle in smoothly English as company language, enabling easy collaboration in our international environment Learning, wellbeing & community Extensive training opportunities, including subsidized English and German language courses Subsidized sports membership with access to over 7,000 sport clubs Monthly social events and company restaurant with employee discounts Free access to a professional mental health support platform