1. STATUS OF THE CRESCENT FLEX- TAPES FOR THE ATLAS PIXEL DISKS G. Sidiropoulos 1

2. 2 Using the Bonn Quad Flex Design or the Liverpool Quad Flex Pros -Using the Existing Bonn Quad Flex Design -Minimum or virtually no TAB bending -Ideal for use on the bench and interconnect peripherals -Fastest required design time G.Sidiropoulos Cons -Not suitable for the most inner and most outer rings -Tabs may be floppy but stiffeners will be added Prototype Choice New Approach

3. 3 The outline of the Flex Tape G.Sidiropoulos Dimensions 350 to 100mm

4. 4 4 Layer Design Dimensions: 350mm x 100mm before cutting 150 um minimum Trace width and Clearance Minimum VIA diameter 0.4 mm (0.2mm hole) VIAs going through all 4 Layers Minimize material wherever possible Special Cutting of the Tape’s shape 200um thick rigidizers supporting the connectors of the flex on the opposite side Quantity: 3 to 5 items Option to Solder either 40 pin Connector for higher current or a 30 pin Connector for compatibility with the Bonn Flex G.Sidiropoulos Features Quoted Prices from Flexible Technologies

5. 5 G.Sidiropoulos Layer Stack for the crescent Flex Tape Reflecting Manufacturer capabilities

6. 6 Status of the Prototype Crescent Tape Done -Completed Routing of the High Speed Signals Layer -Completed Routing of the Serial Power Layer -Completed Routing of the HV Layer -Completely Routed the first TAB -Received Price Quote from Flexible Technologies Doing -Investigating Routing Automation for the TABs To Do by 28/02/2014 -Routing all Module TABs -Routing Eos TABs -Finalise the contour of the Tape -Send for Fabrication G.Sidiropoulos New Approach Differential Pairs 150 um Trace width and Clearance

7. 7 Status of the Prototype Crescent Tape G.Sidiropoulos New Approach Serial Power 5mm Trace width 200um Clearance

8. 8 Status of the Prototype Crescent Tape G.Sidiropoulos New Approach High Voltage Distribution 200 um Trace width 800um Clearance There is space to increase the clearance

9. 9 G.Sidiropoulos Various Detailed Views Area Left for Wire-bonding Fingers

10. 10 Low profile Stacking Connectors from Panasonic Interconnecting the tape with the modules and the End of Structure Card 1/2 G.Sidiropoulos P4S Series Connectors 0.4mm pitch

11. 11 Low profile Stacking Connectors from Panasonic Interconnecting the tape with the modules and the End of Structure Card 2/2 G.Sidiropoulos P4S Series Connectors 0.4mm pitch

12. 12 Connector Availability Interconnecting the tape with the modules and the End of Structure Card 2/2 G.Sidiropoulos Flex Tape Module TAB Flex Tape EoS TAB Quad Flex Module TAB EoS Adapter Card Source

13. 13 G.Sidiropoulos Diskette Flex Tapes Summary Changed TABs modularity from 9 to 5 per crescent tape Upgraded the Connector to allow more current available to the Quads Using both Connectors and Wire bond fingers (Awaiting info from Ilya) Investigated the short term and fastest to implement solution with an eye on fast prototyping and bench testing as well Design is >70% Complete Received Price Quote for fabrication Investigated Connector Availability Started Investigating a longer term scenario that will cover the most inner and outer rings

14. 14 Something funny for the end. Have a nice Day G.Sidiropoulos

15. 15 Backup Slides G.Sidiropoulos

16. 16 G.Sidiropoulos The Bonn Quad Flex Things to figure out How to handle the tiny parts on the flex for soldering What to use as a rigidizer during the parts assembly on the flex. How to attach/remove it. How to glue the sensors …

17. 17 G.Sidiropoulos What the custom Quad Flex would look like (thanks to some Photoshoping ) Quad Flex Things to figure out Were to put the connector pigtail What would be the length of the pigtail …

18. Image of the 30 pin matting (socket) connector on the flex tape side 40 pin connectors to be ordered soon AXT630224

19. 19 The layout of the tape for outer Single Ring tape This is the bottom view for the tape. Wire Bonding Footprints are on the bottom side and they will fold facing front Typical TAB dimensions are 47x14mm and EoS part dimensions are 160x42mm. Current Tape width is 13 mm. Ideal would be 15mm to fully readout all modules Note: The ends of the tape near to the pipe are “smoothed” G.Sidiropoulos Replace with Connectors? Replace with Connectors Used in IBL Previous Approach

20. 20 Differential Impedance for the High Speed Traces G.Sidiropoulos We need a lot more material if we have the High speed traces in an internal layer and covered with a top hatched ground plane Source http://www.eeweb.com/toolbox/edge-coupled-microstrip-impedance/

21. 21 Scenario 2: Using a custom made Quad Flex for the Endcaps Pros -Smaller length on the TABS -Suitable for the most inner and most outer rings -TABS can be bended to be parallel to the Beam pipe G.Sidiropoulos Cons -Requires a custom made Quad Flex design -Several things to ponder on before adopting -Bending tests will be needed Future Choice New Approach

22. 22 Scenario 2: Using a custom made Quad Flex for the Endcaps G.Sidiropoulos Image by Fred Cannaway New Approach

23. 23 Connector Pin-outs G.Sidiropoulos Used on the Bonn Flex Proposed to be used in IBL  Only 2 Diff pairs for read out when 4 are needed (1 per FEI-4). Possible use of multiplexing? Workaround: Add the 20 lines needed onTABs 6-8 Reasons for Using Connectors Drawback: Not enough power pins selected to handle the required current for a Quad Module Drawback: Not enough power pins selected to handle the required current for a Quad Module

24. 24 G.Sidiropoulos Upgrading the Connectors for Higher Current Bottom side of the Bonn flex viewed from top (mirrored) The pin numbering has a circular increasing pattern Pin numbering has an increasing pattern in 2 rows Thus the suggested pin-out for the 40 pin connector on the Quad flex connector has to change again