The Planning of the Cryogenic Supply Infrastructure for the Superconducting Cavities of the European XFEL Linear Accelerator.

A 1.7 km long pulsed, superconducting linear accelerator is planned to deliver electrons at energies up to 20 GeV for the European X-ray Free Electron Laser, ‘European X-FEL’. The 3.4 km long accelerator/X-FEL system starts at the DESY site with two parallel injector sections and a booster section in line with the rest of the linac. The linac will consist of about 120 cryomodules each containing a quadrupole magnet package and eight 9-cell niobium cavities operated at 1.3 GHz in a helium bath at 2 K and at shield temperatures around 6 K and 60 K. As part of the preparation phase for the start of the civil engineering (“plan approval procedure”) the pre-planning of the tunnel layout, of all underground shafts, buildings and necessary infrastructure was completed. The planning of the cryogenic supply infrastructure for the XFEL linac is presented. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]