| Legal Entity | Short Name | Country | Type |
| Politecnico Milano | POLIMI | Italy | Coordinator |
| Max Born Institute | MBI | Germany | Beneficiary |
| University of Lund | LUND | Sweden | Beneficiary |
| Deutsches Elektronen Synchrotron | DESY | Germany | Beneficiary |
| Max Planck Institute for Quantum Optics Garching | MPQ | Germany | Beneficiary |
| Aarhus University | AU | Denmark | Beneficiary |
| Amplitude Technologies | AMPL | France | Beneficiary |
| Commissariat à l’énergie atomique et aux énergies alternatives | CEA | France | Beneficiary |
| Foundation for Research and Technology-Hellas | FORTH | Greece | Beneficiary |
| Femtolasers | FEMTO | Austria | Beneficiary |
| Max Planck Insitute for nuclear physics Heidelberg | MPIK | Germany | Beneficiary |
| University of Freiburg | FREIB | Germany | Beneficiary |
| TRUMPF scientific lasers | TRUMPF | Germany | Partner Organization |
| “Excite Youth for Engineering, Science and Technology” | EYESTyzw | Belgium | Partner Organization |
| Museo Nazionale della Scienza e della Tecnologia Leonardo da Vinci | MUST | Italy | Partner Organization |
| Venteon | VENT | Germany | Partner Organization |
| Universidad Autonoma de Madrid | MAD | Spain | Partner Organization |
| Costruzioni Apparecchiature Elettroniche Nucleari | CAEN | Italy | Partner Organization |
| Photek | PHOTEK | England | Partner Organization |
| Elettra-Sincrotrone Trieste | ELETTRA | Italy | Partner Organization |