FZJ, Jülich
TU Darmstadt, Darmstadt
Since many years, sc cavities have been designed and tested in Juelich: The 5-cell elliptical prototype cavity for the ESS was measured in a horizontal cryostat. A vertical test cryostat was installed to characterise the Halve Wave Resonators (HWRs) for the COSY linac project and several spoke-type cavities. During the measurements of the 352 MHz, tripple-spoke cavity (designed and built within the Hippi collaboration) a 2K operation was established using some refurbished pumps from the University of Wuppertal. First experiences with the 2 K operation, sometimes hindered by thermo-acoustic oscillations and the final results of the 352 MHz spoke-cavity will be presented. Furthermore we will report on the cryomodule performance, build for the Half Wave Resonators. Currently one prototype cavity was completed with a titanium helium cover and installed into the cryostat. The whole system with one cavity is now ready for first RF test.
