CMS upgrade and new challenges to radiation hardness of silicon detectors

Full text: As in September 2009 the LHC is finally scheduled to start operation, we are already involved in developing new strategies for the upcoming SLHC / CMS upgrade. The increased luminosity of this machine leads to higher particle rates that pose new requirements to the radiation hardness of silicon detectors as used in the tracker of CMS. Different sensor materials like magnetic Czochralski and epitaxial silicon will be compared to the standard float zone silicon, including different technologies (i.e. n strips in n bulk, n strips in p bulk). The ideal silicon sensor has to be found in terms of radiation tolerance and other characteristics that have to be studied after irradiation up to expected SLHC fluences. To prevent radiation damages from annealing ('healing' by diffusion etc.) during measurement, we designed and built an extension to our measuring unit with the capability of cooling silicon sensors that also allows heating to study beneficial annealing. This presentation will give an overview on the design and realisation of this unit and its capabilities along with an outlook on the tasks it will be used for. (author)