# Presentation: 217407

## Opto-Board

- K.K. Gan
- The Ohio State University

- WBS 1.1.1.4

- US ATLAS Pixel Meeting

- K.K. Gan

## Outline

- Introduction
- Opto-board design
- Cost and schedule summary
- Conclusions

- US ATLAS Pixel Meeting

- K.K. Gan

## ATLAS Pixel Opto-link

- 6-7 x

- US ATLAS Pixel Meeting

- K.K. Gan

## OSU Responsibilities

- design and testing of VDC and DORIC
- 		testing 50% of final production
- design, fabrication, and testing of opto-boards
- 		 fabrication and testing of disk sector in final production

- US ATLAS Pixel Meeting

- K.K. Gan

## OSU ATLAS Personnel

- Faculty
- 		K.K. Gan, Harris Kagan, Richard Kass
- Post-docs
- 		Mike Zoeller + offer pending
- Graduate Students
- 		Kregg Arms, Rouben Ter-Antonian
- Engineers
- 		Mark Johnson, Chuck Rush
- Technicians
- 		Jim Burns, Shane Smith, Bob Wells

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board

- contains 6-7 optical links:
- 		layers 1 and 2 optical link:
- 		 	DORIC, VDC, PIN/VCSEL (opto-pack)
- 	B layer optical link:
- 		 	DORIC, 2 VDC, PIN/2 VCSEL (opto-pack)
- use BeO for heat management but prototype initially
- 	in FR4 for fast turnaround and cost saving

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Prototype I

- 	contain 6 opto-links for use in disk sector
- 	use SCT style opto-packs
- 	use 50-pin connector
- 	fabricated using FR4 in January 2001

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Prototype I

- Opto-Packs

- VDC

- DORIC

- US ATLAS Pixel Meeting

- K.K. Gan

## Bit Error Rate Tester

- 	send bi-phase marked pseudo random data to VCSEL via VDC
- 	 check returned data for bit errors

- VDC

- VCSEL opto-pack

- PIN opto-pack

- US ATLAS Pixel Meeting

- K.K. Gan

## PIN Current Threshold  of DORIC-I1

- mounted on PP0

- no degradation of PIN current threshold for no bit errors
- 	as more links are added on opto-board and PP0

- US ATLAS Pixel Meeting

- K.K. Gan

## Setup with PP0

- ISET + VPIN

- opto-board

- BER tester

- US ATLAS Pixel Meeting

- K.K. Gan

## Setup with PP0

- data return

- opto-board

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Prototype II

- 	contain 7 opto-links for use in barrel and disk
- 	use opto-packs with multiple PINs
- 	use 80-pin connector
- 	fabricated using FR4 in April 2001

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Prototype II

- 	 PIN current thresholds for no bit errors comparable with prototype I

- DORIC-D2

- VDC-D2

- VCSEL opto-pack

- 3-PIN opto-pack

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Prototype III

- 	and DORIC- I2/4-channel VDC-I2
- 	contain 7 opto-links for use in barrel and disk
- 	use SCT style opto-packs
- 	use 80-pin connector
- 	fabricated using FR4
- 	expect delivery by November 15

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Prototype III

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Prototype IV

- 	contain 7 opto-links for use in barrel and disk
- 	use 8-channel opto-packs
- 	use 80-pin connector
- 	fabricated using FR4
- 	expect submission in summer 2002
- 	last submission before using BeO

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Link Proton Irradiation

- 		designed and fabricated test boards for VDC-D1 irradiation
- 	 April 2001:
- 		 designed and fabricated test systems:
-  	packaged DORIC-D2 and VDC-D2 irradiation in cold box
-  	optical link irradiation on shuttle
- 	some dice started failing after several Mrad
- 	 September 2001:
- 		 designed and fabricated much improved test systems:
-  	packaged DORIC-I1 and VDC-I1 irradiation in cold box
-  	optical link irradiation on shuttle

- US ATLAS Pixel Meeting

- K.K. Gan

## Test Boards for Irradiation in Cold Box

- BER Tester

- DORIC Distribution Board

- 20 MHz

- VDC Distribution Board

- Beam Area Distribution Board

- Test Boards

**1 m ribbon**

**coaxial**

**25m ribbon**
**+**
**25 m coaxial**

**5m Ribbons**

- US ATLAS Pixel Meeting

- K.K. Gan

## 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

- VDC

- VCSEL

- Opto-pack

- Opto-link

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Test System for Shuttle

**Opto-Board**

**Copper/Fiber Hybrid Cable**

**BER Tester**

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Bit Error Threshold vs Dosage

- no further degradation a month after irradiation

- US ATLAS Pixel Meeting

- K.K. Gan

## Optical Power vs. Dosage

- 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
- robust system allows continuous monitoring of BER with low light

- US ATLAS Pixel Meeting

- K.K. Gan

## Summary of VDC-I1/DORIC-I1 Irradiation

- new robust test system allows continuous monitoring
- 	of BER with diminishing light return

- US ATLAS Pixel Meeting

- K.K. Gan

## Changes from ETC01

- DMILL dice appears inadequate in radiation hardness
- adapt IBM as new baseline
- up to 4 IBM test runs expected
- including development of single-ended pre-amp
- change from one to four FR4 opto-board prototypes:
- IBM  DMILL dice
- connector: 50  80 pins
- single  multiple channel dice
- SCT  pixel opto-packs

- US ATLAS Pixel Meeting

- K.K. Gan

## Changes from ETC01 (continued)

- ETC01 based on cost for irradiating VDC-D1
- request by Pixel Collaboration to distribute opto-boards
- 	and testers
- WBS 1.1.1.4 FY02
- 	ETC01: $51 K
- 	ETC02: $75 K

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Milestones

- US ATLAS Pixel Meeting

- K.K. Gan

## Manpower FTE (DOE Base Funding)

- US ATLAS Pixel Meeting

- K.K. Gan

## Manpower FTE (Project Funding)

- US ATLAS Pixel Meeting

- K.K. Gan

## Slide 30

- US ATLAS Pixel Meeting

- K.K. Gan

## Summary

-      	both opto-boards can operate with low noise
- has submitted third FR4 prototype
- expect one more FR4 prototype submission in summer 2002
- 	before submitting first BeO prototype
- has almost perfected opto-link proton irradiation test systems

- US ATLAS Pixel Meeting

- K.K. Gan