cms week, cern, 07-11 june 2004 08 jun 2004cms week - bonding wgsalvatore costa - catania...
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![Page 1: CMS Week, CERN, 07-11 June 2004 08 Jun 2004CMS Week - Bonding WGSalvatore Costa - Catania Documentation of the loop of the to-be-pull-tested bonds placed](https://reader035.vdocuments.net/reader035/viewer/2022070306/55161cca550346cf6f8b674b/html5/thumbnails/1.jpg)
CMS Week, CERN, 07-11 June 2004
08 Jun 2004CMS Week - Bonding WGSalvatore Costa - Catania
Documentation of the loopof the to-be-pull-tested bonds placed
in the PA Test areasin Catania
Salvatore CostaUniversità di Catania and INFN – Sezione di Catania
![Page 2: CMS Week, CERN, 07-11 June 2004 08 Jun 2004CMS Week - Bonding WGSalvatore Costa - Catania Documentation of the loop of the to-be-pull-tested bonds placed](https://reader035.vdocuments.net/reader035/viewer/2022070306/55161cca550346cf6f8b674b/html5/thumbnails/2.jpg)
08 Jun 2004CMS Week - Bonding WG 2 Salvatore Costa - Catania
Procedure
Uses a few of the identical symmetrical bonds we place on the PA Tests areas, currently pull-tested on a sampling basis.1. Document the original bond
2. Straighten a bond to (near) triangular shape
3. Measure the angle at the bond foot
4. Determine correction factor for pull strengths
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08 Jun 2004CMS Week - Bonding WG 3 Salvatore Costa - Catania
1. Document the original bond
• Gently push bond over with the pull tester hook until it rests flat on the PA surface, but taking care that its shape is not significantly altered.
• Take snapshot of bond under Mitutoyo measuring machine.
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08 Jun 2004CMS Week - Bonding WG 4 Salvatore Costa - Catania
2. Make bond triangular• Gently pull bond up at mid-span with the pull tester hook until it takes a
(nearly) triangular shape (figure below).
• Gently push bond over with the pull tester hook until it rests flat on the PA surface, but taking care that its now triangular shape is not significantly altered.
![Page 5: CMS Week, CERN, 07-11 June 2004 08 Jun 2004CMS Week - Bonding WGSalvatore Costa - Catania Documentation of the loop of the to-be-pull-tested bonds placed](https://reader035.vdocuments.net/reader035/viewer/2022070306/55161cca550346cf6f8b674b/html5/thumbnails/5.jpg)
08 Jun 2004CMS Week - Bonding WG 5 Salvatore Costa - Catania
3. Measure angle at bond foot
• Take snapshot of triangularized bond under Mitutoyo.• Measure angle with Mitutoyo.
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08 Jun 2004CMS Week - Bonding WG 6 Salvatore Costa - Catania
4. Determine correction factor (1)
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08 Jun 2004CMS Week - Bonding WG 7 Salvatore Costa - Catania
4. Determine correction factor (2)
Correction factor:a = 1 / (2 sin)
(º) corr. factor a
10 2.88
20 1.46
30 1
40 0.79
50 0.65
60 0.58
70 0.53
80 0.51
90 0.5
For symmetrical bond:
![Page 8: CMS Week, CERN, 07-11 June 2004 08 Jun 2004CMS Week - Bonding WGSalvatore Costa - Catania Documentation of the loop of the to-be-pull-tested bonds placed](https://reader035.vdocuments.net/reader035/viewer/2022070306/55161cca550346cf6f8b674b/html5/thumbnails/8.jpg)
CMS Week, CERN, 07-11 June 2004
08 Jun 2004CMS Week - Bonding WGSalvatore Costa - Catania
Salvatore Costa
Bondingin
CATANIA
Università di Catania and INFN – Sezione di Catania
![Page 9: CMS Week, CERN, 07-11 June 2004 08 Jun 2004CMS Week - Bonding WGSalvatore Costa - Catania Documentation of the loop of the to-be-pull-tested bonds placed](https://reader035.vdocuments.net/reader035/viewer/2022070306/55161cca550346cf6f8b674b/html5/thumbnails/9.jpg)
08 Jun 2004CMS Week - Bonding WG 9 Salvatore Costa - Catania
Catania: bond accounting
Module Type IB34 IB12phi Total
Received from Gantry
71 34 105
Bonded 45 33 78
ARC tested 44 33 77
OK 44 31 75
bad 2 2
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08 Jun 2004CMS Week - Bonding WG 10 Salvatore Costa - Catania
Catania: (bond) faults
• 2 Modules (30200020035289, …303) fail ARC Fast Tests Low Voltage test: I(V2.50)=804 mA (max 750 mA)Still not understood
• 1 Module (30200020035305) can’t power up 2 APVs – Damage to connector? False alarm: misplugged connector
• In one recent group of 11 modules (bias bonded, readout not bonded yet), 5 anomalous IV curves
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08 Jun 2004CMS Week - Bonding WG 11 Salvatore Costa - Catania
Catania: new tool type
• We reached more than 40,000 bonds with one tool
• Changed tool and tool type to one suggested by Palomar Tech engineer– Designed specifically for
Hughes (Palomar) 2470 wedge bonder
• Last (1) Module bonded with new tool– Par not yet optimized– Much higher pull forces (13-
15g), but lift-offs/cratering