339 research outputs found
Study of indium bumps for the ATLAS pixel detector
No full textThe bump-bonding technology is used to join the front-end read-out chips to the silicon substrate of the ATLAS pixel detector. We review the current status of the technology used by Alenia Marconi Systems and we report on the electrical and mechanical properties and the defect rate of the indium bumps. (1 refs)
Results on 0.7% X0 thick pixel modules for the ATLAS detector
No full textModules are the basic building blocks of the ATLAS pixel detector system, they are made of a silicon sensor tile containing ~46000 pixel cells of 50 mu m*400 mu m, 16 front-end chips connected to the sensor through bump bonding, a kapton flex circuit and the module controller chip. The pixel detector is the first to encounter particles emerging from LHC interactions, minimization of radiation length of pixel modules is therefore very important. We report here on the construction techniques and on the operation of the first ATLAS pixel modules of 0.7% radiation length thickness. We have operated these modules with threshold of 3700*10+or-300*10, mean noise value of 225*10 and 0.3% dead channels. (3 refs)
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