Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

The superconducting linear accelerator ELBE at the Forschungszentrum Dresden/Rossendorf has two superconducting accelerator modules and a superconducting photo injector (SRF-Gun). They are operated by a cryogenic Helium plant with a cooling power of 200 W at 1.8 K. Since the commissioning of the plant in 1999 minor and major impurity problems have influenced the operation stability of the plant. The presentation will give an overview of the ELBE cryogenic system and will focus on the different sources of plant contamination and their effects on the plant operation, which have been found during the nearly 10 years of plant lifetime. Especially the contamination with oil brake up components as well as air and water from different sources have limited the run periods of the plant and effected special service and maintenance procedures.