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Status Wuppertal

This document outlines the advancements in the opto-electronic readout systems for the SLHC, focusing on the current status of the ATLAS pixel system in Wuppertal. With innovations such as the integration of 1744 modules containing 46080 sensor cells and the use of advanced opto-boards, the system supports enhanced data rates through optimized channel design and efficient interfacing. This analysis touches upon critical aspects such as wiring, data transmission methods, and the potential to improve pixel density—ultimately enhancing performance while maintaining stability in high-radiation environments.

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Status Wuppertal

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  1. Status Wuppertal Opto-Electronic Readout Systems for SLHC

  2. Tiny Outline • Current ATLAS Pixel system • Data rates • Possibilities in Wuppertal SLHC OLink Status Wtal

  3. ATLAS Pixel System • 1744 Modules of 46080 sensor cells • Per 6/7 Modules one ‘opto-board’ • Electr. connection module <-> opto-boardvia self-bundled ‘type0’ cables • Aluminium wires for LV-supplies and • Twisted pair Al wires for data(150µm, 70Ohm, Polyfil (Zug, CH) • A Kapton circuit serves as patch panel, connecting type0 cables and optoboard SLHC OLink Status Wtal

  4. opto-board • BeO carrier (OSU) with • receiving and transmitting asics(OSU & Siegen) • Truelight VCSEL- & PiN-arrays • VCSELs are oxide-confined • Irradiated to 1015 n 1MeV equiv SLHC OLink Status Wtal

  5. Fibres • Ctrl: 50µm GRIN -> 50µm SIMM • Data: 50µm SIMM -> 62.5 GRIN • Complete cables ordered at Ericsson & Diamond (Losone,CH) • One Ctrl fibre and one or two Data fibres per module SLHC OLink Status Wtal

  6. Off Detector • Wuppertal adapted the SCT design to pixel needs • Reduced number of channels • Higher data-rates • Reuse of the opto-interfacing asics and same Truelight Vcsel- & PiN-arrays (8way instead of 12way) SLHC OLink Status Wtal

  7. Data rates • Pixel is NOT part of Level1 Trigger • Rough calculation per Module (of 1744): Raw data: 50000 cells x 40MHz x 0.1% Occu. x 25Bit/Hit = 5·1010 Bit/s Trigger LVL1 reduction: 50000 cells x 100kHz x 0.1% Occu. x 25Bit/Hit = 1.25·106 Bit/s And we would like to reduce the pixel size (== increase numbers of pixels per module) SLHC OLink Status Wtal

  8. Data Format • Ctrl. is encodes as BPM, combining 40MHz clock and ctrl stream • Decoded on opto-board • Data is NRZ with 40MHz, 80MHz or 2x80MHz • No encoding SLHC OLink Status Wtal

  9. Ideas in Pixel Community • Replace B-Layer ~2012 • This might serve as a nice ‘test-bed’ for an intermediate step for opto-link, too. • Focuses more on detector module, for now. But these changes might need higher data rates. SLHC OLink Status Wtal

  10. Ideas in Wtal • How can Pixel contribute to the trigger? • On-detector ideas • Data-link • Off-detector electronics • Packaging • Depending on the electrical frequencies needed, the will be a need of a very high quality substrate -> MCM-D • Silicon carrier for high definition micro-strip lines Full featured MCM-D pixel detector module (16 Front-End ICs and Ctrl chip on sensor-tile, Which is acting as substrate for intra-connections SLHC OLink Status Wtal

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