An artist rendering of the FLUTE facility (Image: IBPT KIT)

The Institute for Beam Physics and Technology (IBPT) develops and operates the test facility FLUTE (Ferninfrarot Linac- Und Test Experiment) at the Karlsruhe Institute of Technology (KIT) based in Germany.

The test facility is part of the KIT accelerator technology platform (ATP), is constructed in collaboration with the Paul Scherrer Institute and DESY, and will begin to provide access in 2017. The core accelerator consists of an fs chirped laser-driven photo-injector, a linear accelerator (linac) and an electron bunch compressor to provide ultra-short electron bunches.

FLUTE provides an infrastructure for ps and fs electron and photon beam studies to enable innovative technology solutions such as advanced beam diagnostics, synchronization and stabilization schemes, and to create intense terahertz (THz) radiation.


  • R&D test facility and modular accelerator
  • Photo-injector with fs/ps near-IR and UV laser system
  • Electron energies of 7 MeV and 40 to 50 MeV
  • Wide bunch length range from 300 fs down to 1 fs
  • Wide charge range from 1 pC up to 3 nC per bunch
  • Spectral band coverage up to 30 THz
  • THz E-field strength up to 1 GV/m

Support offered

Access to FLUTE will be provided for 8 periods of 5 days per experiment (totalling 320 hours).

Users will be offered on site safety training and KIT staff will provide assistance during the test campaign. In addition, users will be granted access to onsite facilities for the duration of their stay, including temporary storage of data and library services.


While the FLUTE facility is in development, interested parties are encouraged to contact the Coordinator at KIT before beginning the formal application process with brief details of the test campaign proposal to discuss the experiment’s feasibility.

FLUTE Facility Coordinator: Robert Ruprecht