Flex readout study for the ATLAS Alpine Staves layout.

LAPP is involved in the phaseII upgrade the ATLAS pixels tracker: the group is currently designing a pixel detector layout called Alpine Staves. This layout should save matter in the detector. The silicon detectors should also cover a very high angle in the forward region. The pixel modules data should be serialized at the end of the staves and the transmission between pixels and serializer is an issue. The aim of this study is to estimate the feasibility of data transmission and powering of the front-end thanks to a flex according to the foreseen data rates and the available technology. The High data rates will need high speed transmissions as optical fibers but the high radiation doses and the matter budget imply to move optical transceivers to the end of staves.