Download - Opto Harness FDR
Opto Harness FDR 19/10/01
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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
Opto Harness FDR 19/10/01
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ATLAS SCT Opto-links
Opto Harness FDR 19/10/01
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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
Opto Harness FDR 19/10/01
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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.
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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
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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)
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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)
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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
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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
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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
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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.
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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.