Experimental testing of the TTF RF photoinjector

Results from the experimental testing of the prototype TESLA Test Facility (TTF) RF photoinjector are summarized. Preliminary measurements of the performance of the injector indicate that, with refinement, the design values for the transverse emittances (20/spl times/20 /spl pi/ mm-mr) are not unrealistic, with uncompressed transverse emittances of 40 /spl pi/ mm-mr having been obtained under somewhat less ideal circumstances than those simulated. Preliminary pulse length measurements with and without the pulse compressor suggest pulse compression, but further study is required.