1. K.K. GanUS ATLAS Pixel Meeting1 Opto-Board K.K. Gan The Ohio State University WBS 1.1.1.4

2. K.K. GanUS ATLAS Pixel Meeting2 Outline l Introduction l Opto-board design l Cost and schedule summary l Conclusions

3. K.K. GanUS ATLAS Pixel Meeting3 ATLAS Pixel Opto-link 6-7 x

4. K.K. GanUS ATLAS Pixel Meeting4 OSU Responsibilities l design and testing of VDC and DORIC P testing 50% of final production l design, fabrication, and testing of opto-boards P fabrication and testing of disk sector in final production

5. K.K. GanUS ATLAS Pixel Meeting5 OSU ATLAS Personnel l Faculty K.K. Gan, Harris Kagan, Richard Kass l Post-docs Mike Zoeller + offer pending l Graduate Students Kregg Arms, Rouben Ter-Antonian l Engineers Mark Johnson, Chuck Rush l Technicians Jim Burns, Shane Smith, Bob Wells

6. K.K. GanUS ATLAS Pixel Meeting6 l converts: optical signal  electrical signal l contains 6-7 optical links: P layers 1 and 2 optical link: u DORIC, VDC, PIN/VCSEL (opto-pack) P B layer optical link: u DORIC, 2 VDC, PIN/2 VCSEL (opto-pack) l use BeO for heat management but prototype initially in FR4 for fast turnaround and cost saving Opto-Board

7. K.K. GanUS ATLAS Pixel Meeting7 l design for DORIC-D2/VDC-D2 l contain 6 opto-links for use in disk sector l use SCT style opto-packs l use 50-pin connector l fabricated using FR4 in January 2001 Opto-Board Prototype I

8. K.K. GanUS ATLAS Pixel Meeting8 Opto-Board Prototype I Opto-Packs VDCDORIC

9. K.K. GanUS ATLAS Pixel Meeting9 Bit Error Rate Tester l send bi-phase marked pseudo random data to VCSEL via VDC l check returned data for bit errors VDC VCSEL opto-pack PIN opto-pack

10. K.K. GanUS ATLAS Pixel Meeting10 PIN Current Threshold of DORIC-I1 mounted on PP0 l no degradation of PIN current threshold for no bit errors as more links are added on opto-board and PP0

11. K.K. GanUS ATLAS Pixel Meeting11 Setup with PP0 ISET + VPIN opto-board BER tester

12. K.K. GanUS ATLAS Pixel Meeting12 Setup with PP0 data return opto-board

13. K.K. GanUS ATLAS Pixel Meeting13 l design for DORIC-D2/VDC-D2 and DORIC- I1/VDC-I1 l contain 7 opto-links for use in barrel and disk l use opto-packs with multiple PINs l use 80-pin connector l fabricated using FR4 in April 2001 Opto-Board Prototype II

14. K.K. GanUS ATLAS Pixel Meeting14 l large distance between DORIC and PIN l PIN current thresholds for no bit errors comparable with prototype I Opto-Board Prototype II DORIC-D2 VDC-D2VCSEL opto-pack 3-PIN opto-pack

15. K.K. GanUS ATLAS Pixel Meeting15 l design for DORIC-D3/VDC-D3 and DORIC- I2/4-channel VDC-I2 l contain 7 opto-links for use in barrel and disk l use SCT style opto-packs l use 80-pin connector l fabricated using FR4 l expect delivery by November 15 Opto-Board Prototype III

16. K.K. GanUS ATLAS Pixel Meeting16 Opto-Board Prototype III

17. K.K. GanUS ATLAS Pixel Meeting17 l design for 4-channel DORIC- I4 and VDC-I4 l contain 7 opto-links for use in barrel and disk l use 8-channel opto-packs l use 80-pin connector l fabricated using FR4 l expect submission in summer 2002 l last submission before using BeO Opto-Board Prototype IV

18. K.K. GanUS ATLAS Pixel Meeting18 l April 2000: P designed and fabricated test boards for VDC-D1 irradiation l April 2001: P designed and fabricated test systems: u packaged DORIC-D2 and VDC-D2 irradiation in cold box u optical link irradiation on shuttle  some dice started failing after several Mrad l September 2001: P designed and fabricated much improved test systems: u packaged DORIC-I1 and VDC-I1 irradiation in cold box u optical link irradiation on shuttle Opto-Link Proton Irradiation

19. K.K. GanUS ATLAS Pixel Meeting19 Test Boards for Irradiation in Cold Box BER TesterDORIC Distribution Board 20 MHzVDC Distribution Board Beam Area Distribution Board Test Boards 1 m ribbon coaxial 25m ribbon + 25 m coaxial 5m Ribbons

20. K.K. GanUS ATLAS Pixel Meeting20 Test Boards for Irradiation in Shuttle Opto-board with 6 opto-links Bit error rate tester in control room ( 6 boards) 25 m fibers/wires Bi-phase marked optical signal Decoded data data DORIC clock PIN VDCVCSEL Opto-pack Opto-link

21. K.K. GanUS ATLAS Pixel Meeting21 Opto-Board Test System for Shuttle Opto-Board Copper/Fiber Hybrid Cable BER Tester

22. K.K. GanUS ATLAS Pixel Meeting22 l PIN current threshold for no bit errors remains constant up to 40 Mrad l no further degradation a month after irradiation Opto-Board Bit Error Threshold vs Dosage

23. K.K. GanUS ATLAS Pixel Meeting23 l optical power decreases drastically with dosage: P annealing at ~ 3 Mrad failed to yield more light  need longer annealing further away from beam  will add one more meter of rad-hard fibers l robust system allows continuous monitoring of BER with low light Optical Power vs. Dosage

24. K.K. GanUS ATLAS Pixel Meeting24 l VDC-I1/DORIC-I1 continue to perform well after 40-50 Mrad P new robust test system allows continuous monitoring of BER with diminishing light return Summary of VDC-I1/DORIC-I1 Irradiation

25. K.K. GanUS ATLAS Pixel Meeting25 l ETC01 based on 2 DMILL test runs piggybacked on FE runs l DMILL dice appears inadequate in radiation hardness  adapt IBM as new baseline  up to 4 IBM test runs expected P including development of single-ended pre-amp  change from one to four FR4 opto-board prototypes: P IBM  DMILL dice P connector: 50  80 pins P single  multiple channel dice P SCT  pixel opto-packs Changes from ETC01

26. K.K. GanUS ATLAS Pixel Meeting26 l much more sophisticated proton irradiation test systems P ETC01 based on cost for irradiating VDC-D1 l request by Pixel Collaboration to distribute opto-boards and testers l WBS 1.1.1.4 FY02 P ETC01: $51 K P ETC02: $75 K Changes from ETC01 (continued)

27. K.K. GanUS ATLAS Pixel Meeting27 Opto-Board Milestones

28. K.K. GanUS ATLAS Pixel Meeting28 Manpower FTE (DOE Base Funding)

29. K.K. GanUS ATLAS Pixel Meeting29 Manpower FTE (Project Funding)

30. K.K. GanUS ATLAS Pixel Meeting30

31. K.K. GanUS ATLAS Pixel Meeting31 l has produced two FR4 opto-board prototypes P both opto-boards can operate with low noise l has submitted third FR4 prototype l expect one more FR4 prototype submission in summer 2002 before submitting first BeO prototype l has almost perfected opto-link proton irradiation test systems Summary