Laser Heater system for the injector; design, production, test, delivery, and commissioning

Coordinating university or institute

Uppsala University,



Project description

X-ray Free Electron Lasers are often driven by high-brilliance photo-cathode radio-frequency guns which generate electron beams. These electron beams are very cold, which can lead to micro-bunching instabilities. The purpose of the laser heater is to gently and in an easily adjustable way heat up the electron beam in order to avoid such instabilities. The laser heater is in constant use at the European XFEL as it alleviates the tuning process and increase the energy of the outgoing light pulses with about 40% (up to 500% demonstrated). Between 2018-2021 the uptime has been 99,8%.




Uppsala University:

  • Mathias Hamberg
  • Niklas Johansson
  • Masih Noor
  • Simon Fahlström
  • Volker Ziemann

Core deliverables

  • A laser heater

Total budget


Procurement codes

Electronics and radio frequency

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