opto harness fdr

Opto Harness FDR 19/10/01

T. Weidberg 1

Opto Harness FDR

• Scope and aims of review, system overview• Available documentation• Status of Project & Schedule• Prototype results• Barrel and Forward harnesses

– Definitions

– Assembly and Test procedures

• Outstanding Issues


T. Weidberg 2

ATLAS SCT Opto-links


T. Weidberg 3

Scope and Aims

• Review concepts for entire system– Electrical and optical services for barrel and

forward SCT.

• Look at prototype results• Review proposed procedures for

– Assembly of barrel and forward harnesses

– Test

– Mounting on barrels and disks.

– QA


T. Weidberg 4

Documentation

• Aim to have full documentation on EDMS. – Common items

– Barrel Harness

– Forward Harness

• Availability : – green – available now

– Purple – required for PRR or later

– Red - still missing.


T. Weidberg 5

SCT Link Common Items(1)Opto-Electronics

1. VCSEL (Taiwan) ATL-IS-TR-00042. PINs (Birmingham) ATL-IS-TR-0005

– ASICS

3. VDC (TW) ATL-IS-ES-00444. DORIC4A (TW) ATL-IS-ES-00435. DRX (TW) ATL-IS-ES-00456. BPM12 (TW) ATL-IS-ES-0046

– Off-Detector

7. PIN array (Taiwan) ATL-IS-ES-00518. VCSEL array (Taiwan) ATL-IS-ES-00529. (BOC card ???– Cambridge)

– Fibres and Connectors

10.Rad-hard fibre specs (TW) ATL-IS-ES-004811.MT connector, spring clips and Infineon connectors (JM) ATL-IS-ES-

0053


T. Weidberg 6

SCT Link Common Items(2)• Protective cable (CM)

• Adhesives (JM) ATL-IS-ES-0054PP2

1. Fibre connections (JF)

2. Cable connections (AN)

• Qualification Testing (SG) ATL-IS-ES-0055

• Database (CM & TW) ATL-IS-AT-0007

(what data is stored and how)


T. Weidberg 7

Barrel Harness (1)Requirements and specifications (TW) ATL-IS-ES-0049 Harness definition and interfaces (AN & JF) ATL-IS-AT-0008(This includes drawings and tables with geometrical specs, fibre

lengths and low mass tape lengths up to PPB1.). Design Information1. barrel opto-packages (Taiwan) ATL-IS-AT-00092. Dog-legs, redundancy links and interface PCBs (MJ & TW)

ATL-IS-ES-00473. Low mass tapes (Ljubljana) ATL-IS-AT-00134. Harness screening and grounding (AN & MM) ATL-IS-ES-

00565. PPB1 for fibres and low mass tapes (AN & Ljubljana) ATL-IS-

ES-00576. PPB1 to PP2 cable and fibre lengths (AN & JF)


T. Weidberg 8

Barrel Harness (2) Prototype results

1. Results for prototype barrel harness (module-1s and module0s) (CM) ATL-IS-TR-0006

Production and Testing

1. Test and assembly flow chart (CM and JM) ATL-IS-AP-0055

2. Results for prototype barrel harness (module-1s and module0s) (CM) ATL-IS-TR-0006

3. Detailed assembly and test instructions (Taiwan)

4. Tests at RAL on receipt of harness (TW) ATL-IS-ES-0058

5. Installation on barrels (JM) ATL-IS-AP-0058


T. Weidberg 9

Forward Harness (1) Requirements and specifications (TW) ATL-IS-ES-0063

Harness definition and interfaces (JT and JN) ATL-IS-AT-0011

(This includes drawings and tables with fibre lengths up to PP0.)

Design Information

1. Forward SCT opto-packages (Taiwan) ATL-IS-ES-0059

2. PPF0 (JT) ATL-IS-EN-0010

3. PPF0 to PP2 cable and fibre lengths.

Prototype results

1. Results for prototype forward fibre harness (CM) ATL-IS-TR-0007


T. Weidberg 10

Forward Harness (2)

Production and Testing

1. Test and assembly flow chart (CM and JM) ATL-IS-AP-0056

2. Detailed assembly and test instructions (Taiwan)

3. Tests at RAL on receipt of harness (TW) ATL-IS-ES-0060

4. Installation on disks (JM) ATL-IS-AP-0057


T. Weidberg 11

Project Status

• 4 module-1 barrel harnesses assembled and used successfully at the system test at CERN.

• New designs exist for larger round cooling pipe. Key test: thermal performance.

• Barrel 3 RAL in April ’02. start harness production Jan. ’02.

• Six forward fibre harnesses assembled.


T. Weidberg 12

Prototype –1 Barrel Harness for old round cooling pipe

6 opto-flex cables with opto-package & ASICs

6 sets low mass tapes


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Opto-flex & Round Cooling Pipe

• New opto-flex designs compatible with barrel drawings. Checked with mechanical dummies on UCL barrel model. Clearance of 1.27 mm to silicon.

• Thermal Management– Transfers heat from opto

ASICs to cooling block via AlN and Cu layer in flex..

– FEA ok

– Need to confirm with measurements..

30 mmSpace for opto-package+ ASICs


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Outstanding Issues(1)

• Verify thermal FEA for opto-flex– Thermal measurements on prototypes at RAL.

• Barrel system test with module-0 barrel opto-flex– Aim to produce 8 module 0 style barrel opto-harnesses.

• Forward system test– 6 forward fibre harnesses are available at CERN.

• Verify thermode soldering technique for Al/kapton tape to PCBs– Proof of principle tests ok for Al.– Procedure widely used in industry for Cu/kapton tapes

(mobile phones).• Complete reliability studies• Finalise QA and database


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Outstanding Issues (2)

• Verify lengths for harnesses with mechanical models– Barrel harness lengths checked with barrel model at UCL.

– Similar check required for forward SCT.

• Understand implications of forward SCT possible change to KB

• Complete SEU studies– Operate opto-flex+SCT module in beam (T7 @PS).

– Check for effects of SEU induced clock jitter on ABCD. Measure BC counter errors.

opto harness fdr

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