AMS02 Ecal gamma trigger performance measured at the October 2004 CERN   test beam
  Test beam data collected in October 2004 at CERN PS to validate the AMS02 Ecal Intermediate Board (EIB) are analyzed. After describing the experimental setup and the event samples, results concerning noise measurement, trigger efficiency and threshold accuracy are presented. They demonstrate that the EIB fulfils the physics requirements. Therefore the analog part of the trigger is validated, and hardware choices are also made towards the final device. 
P. Brun and S. Rosier-Lees