Test results of the Dornier single cell cavity

Test results and technical datas of the Dornier single cell cavity (500 Mhz) are reported. Layout, machining and final preparation of this cavity with an rf surface of about 1 m is done by Dornier and is reported briefly. For the test at 4.2 K the experimental set up of DESY was used. This facility includes a Quench detection system and apparatus for free electron current measurement. The following general characteristics of the cavity were observed: At 4.2 K an acceleration field of 8 MV/m was achieved. No quench was observed at high field. The resonator was limited due to electron loading. At field levels exceeding 5 Mv/m non resonant electron current started to load the cavity Q. At the design acceleration field of 5 MV/m the cavity performed a Qo of 2.7 * 10/sup 9/. The emitter of the non resonant electrons was not detectable