RD infrastructure process driven Physics result driven The

High spatial resolution is the main requirement for the tracking detector Top-down design strategy:

is better in terms of achievable resolution Compared to “p-in-n” detectors: Radiation hardness Possibility

Analogue ? “Binary” Analogue pipeline architecture offers trade-off between data integrity (amplitude information is

Converters ? Module control has to dial with short circuits line ruptures Serial Module

Low voltage: 100 m. A/chip x 2. 5 V / 2. 5 cm 2

Since there is a big asymmetry in the original design, Slot for services what

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R&D, infrastructure ? (process driven) Physics (result driven) The tracker could be built from available frontend and backend modules Example: Liverpool design of a strip module (4 sections of longfor strips Alternatively, a variety of ROCs 22 mm is available whichwith 74. 5 um Wire bonding the sensor geometry could be customised. of objects with different pitch ispitch) a common practice. for the Atlas

High spatial resolution is the main requirement for the tracking detector Top-down design strategy: Physicists should specify granularity of sensors relying on R&D data and MC studies. Liverpool is now committed to measurements of strip detectors with different implant pitch and width and various intermediate strip options.

is better in terms of achievable resolution Compared to “p-in-n” detectors: Radiation hardness Possibility of back-thinning Compared to “n-in-n” detectors: for low material budget Low manufacturing costs (single-side processing) Easy mechanical handling of the backplane Bulk type does not invert - can be operated underdepleted,

Analogue ? “Binary” Analogue pipeline architecture offers trade-off between data integrity (amplitude information is preserved) and high bandwidth. Beetle chip is a good platform for strip detectors. It can also operate in the “binary” readout mode. Limited experience with pixel ROCs (from the lack of available samples : -(

Optics ? “Copper”

Converters ? Module control has to dial with short circuits line ruptures Serial Module dial with Single event burnout causes a permanent short

Low voltage: 100 m. A/chip x 2. 5 V / 2. 5 cm 2 1 k. W/m 2 High voltage: 100 A/cm 2 x 1000 V 1 k. W/m 2 (@ -25 deg. C) Convection: ~ 0. 5 k. W/m 2 (@ -25 deg. C) 2. 5 k. W/m 2 3. 5 k. W (CPT) 20 k. W (CST) 4. 5 k. W (CFT, CBT) 8. 5 k. W (FST) 5. 0 k. W (BST) ~ 50 k. W in total ! • Sensor is cooled through its backplane (suitable for strips) • ROC is cooled (current Atlas pixel system)

Since there is a big asymmetry in the original design, Slot for services what are the implications of a narrow gap for ALL highway services brought together ? • Savings in the material budget • Improved cooling performance • Design uniformity and reliability