PhD Student for the development and characterization of a cryo jet platfrom at HED/XFEL

Website EuropeanXFEL European XFEL

Shaping the future

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.

At the High-Energy-Density instrument (HED) extreme states of matter are investigated with the goal to decipher the physical properties under a wide range of dense and hot conditions, which in turn will deepen our understanding of astrophysical objects and phenomena as well as the dynamic processes in fusion plasmas and plasma accelerators. The instrument offers a variety of X-ray diagnostics and techniques together with powerful drivers including a high-energy 100J laser system for dynamic compression and an ultra-intense 100 TW system for relativistic laser plasmas.

For our High Energy Density (HED) instrument group we are looking for a

PhD Student (f/m/d) for the development and characterization of a cryo jet platfrom at HED/XFEL

The position

The advertised position aims to develop an innovative platform at the HED instrument of European XFEL which delivers well characterized cryogenic liquid jets for discovery science experiments in order to answer fundamental questions in astrophysics, fusion research and laser plasma acceleration processes. Cryogenic jets of liquid hydrogen with few micro-meters in diameter have been successfully demonstrated in first proof-of principle studies. This project aims to push the frontier towards much larger jets exceeding 100 micrometers and enable stable operation under extreme high-power laser conditions at high repetition rates. Advancing the liquid jet injection technology towards novel planar jet shapes, unexplored gas sample and gas mixtures are supplemental goals. The suitable candidate will delve into a multiphysics topic which combines cutting edge disciplines such as cryogenics, vacuum engineering, fluid dynamics of micro-fluids, high resolution optical diagnostics using imaging and scattering methods and exciting experiments in laser plasma physics.
The specific tasks are:
  • design, construction and commissioning of a cryogen jet platform at HED
  • development and implementation of system components to allow high gas throughputs and stable jet operation during extreme laser plasma interactions
  • development and experimental characterization of novel cryogenic jet types (nozzles, gas mixing, etc.)


  • Master’s degree in Engineering Science or Physics with excellent grades
  • high level of motivation to work and participate in a developing academic research environment with potential high impact discoveries for fusion research and laser based particle accelerators
  • profound practical and theoretical knowledge in some of the following fields: Microfluidics, Liquid jet injector systems, Optical particle and flow diagnostics, Cryogenics, Vacuum technology, Piezo actuators and motion control
  • skills in CAD, CFD tools and programming in python is considered an asset
  • good English skills are mandatory to communicate with the experimental team, local companies and international collaborators
  • creative, self-motivated and able to work both alone and as part of a multi-disciplinary team

For additional information, please contact Dr. Sebastian Göde ( .

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 under

Our offer

The European XFEL GmbH employs a diverse, broadly international staff. 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, participate in our international networks, and shape your life upon trust based flexible working times and telecommuting options. Experience our atmosphere of tolerance and respect.
The PhD positions are fully funded for a duration of three years. In justified cases an extension is possible.
Salary amounts to 75% of pay group 13 for civil servants in Germany (TVöD Bund). Further benefits are similar to those of public service organizations in Germany. In addition, European XFEL provides a non-contributory company pension scheme, broad relocation benefits, a subsidized job-ticket for the local public transportation system, as well as our brand-new company restaurant BeamStop. Company language is English, non-German candidates hired from abroad receive an international allowance.
The European XFEL PhD program goes far beyond classical PhD studies. You will have the opportunity to advance your professional, personal and methodical abilities for boosting your scientific career.

Reference number



This appointment is limited to 3 years.


07 October 2020


Please apply online and provide a motivation letter and your CV in English as well as certificates in one single pdf-file.

Applicants with disabilities will be given preference over other equally qualified applicants The European XFEL GmbH is an equal opportunity and affirmative action employer and encourages applications from women

To apply for this job please visit