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In order to test 100 superconducting accelerator modules within two years three test benches have been created in the accelerator module test facility (AMTF) to achieve the rate of one cryomodule per week. Each RF station of the test facility consists of a 5 MW RF station, at 1.3 GHz, 1.37 ms pulse width and 10 Hz repetition rate, with a waveguide distribution system. Each waveguide distribution supplies RF power to eight cavities, four times a pair of cavities. The distribution allows for a maximum power of 1 MW per cavity when the distribution is switched to a mode supplying power to only four cavities. A new type of 1 MW isolator and a new compact 5 MW power divider have been developed to achieve that goal. Several cryomodules have been already successfully tested with this setup. We present the waveguide distribution for this test stand and describe the performance of the different elements. REQUIREMENTS FOR THE AMTF WAVEGUIDE DISTRIBUTION The AMTF [1] waveguide distribution should meet several specific sometimes conflicting requirements. On one side the distribution should have a compact size since there is only limited space in the AMTF shielding tunnel. On the other side it should supply high pulse RF power to the individual cryomodule cavities with high flexibility by only one power klystron. In addition the waveguide distribution has to protect the klystron against reflected power from superconducting cavities. The three basic requirements are: Power per cavity: 1 MW max pulse power 2.2 kW max average power One 5 MW klystron as RF power source The waveguide distribution layout must allow for a free access to the cavity couplers for local clean room installation. In order to satisfy these conditions specific waveguide components, such as a 1 MW isolator and a 5 MW power divider have been developed and integrated in the waveguide distribution. A 3D-view of the AMTF waveguide distribution is shown in Fig.1. During maintenance of RF station the klystron has to be connected to two dummy loads. Therefore a mechanical waveguide switch is installed which allows for quick connection of the klystron and the loads. Figure 1: 3D-view of the AMTF waveguide distribution.

A New Type of Waveguide Distribution for the Accelerator Module Test Facility of the European XFEL