FIRST MEASUREMENTS AT THE PHOTO INJECTOR TEST FACILITY AT DESY ZEUTHEN*

The Photo Injector Test facility at DESY Zeuthen (PITZ) is built to develop electron sources for free electron lasers and future linear colliders. The main goal is to study the production of minimum transverse emittance beams with short bunch length at medium charge (~1nC). The facility includes a 1.5 cell L-band cavity with coaxial rf coupler and solenoid for space charge compensation, a laser capable to generate long pulse trains, an UHV photo cathode exchange system, and different diagnostics tools. Besides an overview of the facility, its main components and their commissioning, this paper concentrates on the first measurements with and without photo electrons. This includes measurements of the rf performance, dark current, laser parameters, beam charge, electron momentum, beam size, and first results on the commissioning of the emittance measurement system.