The Kirchhoff-Institut für Physik in Heidelberg is seeking a research fellow to work on the upgrade of the ATLAS level-1 calorimeter trigger to cope with the conditions imposed by a possible LHC luminosity upgrade. A Ph.D. in experimental particle physics and experience in trigger related studies are required. The position limited to a duration of 4 years. Applications should be sent to : Prof. Karlheinz Meier Kirchhoff-Institut für Physik Ref. HGF-GF Im Neuenheimer Feld 227 D-69120 Heidelberg