Front-end Electronics of the Forward Strip Detector for the ATLAS HL-LHC Upgrade

The ATLAS ITk Strip Detector I All-silicon detector with around 70 million read-out strips. I Modular design with modules assembled into larger structures: staves and petals. I Four barrel layers and six end-cap discs per side. I Integrated cooling, power and read-out electronics. I We present here the construction and testing of prototype hybrids for rings 0, 1, 3, 4 and 5. I Read-out chips glued and wire-bonded onto the hybrids. I ABC (ATLAS Binary Chip) analogue read-out chip connected to the strips, sends data to HCC. I HCC (Hybrid Controller Chip) digital read-out chip sends data from ABC to the DAQ. I Forward region uses “Stereo Annulus” shaped sensors and modules, arranged in rings. I Different number of strips leads to different number of front-end read-out chips. I Changing strip pitch and length for each segment. Sketch of a Petal