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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.

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Presentation on theme: "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."— Presentation transcript:

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 in the PA Test areas in Catania Salvatore Costa Università di Catania and INFN – Sezione di Catania

2 08 Jun 2004CMS Week - Bonding WG2 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

3 08 Jun 2004CMS Week - Bonding WG3 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.

4 08 Jun 2004CMS Week - Bonding WG4 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.

5 08 Jun 2004CMS Week - Bonding WG5 Salvatore Costa - Catania 3. Measure angle at bond foot Take snapshot of triangularized bond under Mitutoyo. Measure angle with Mitutoyo.

6 08 Jun 2004CMS Week - Bonding WG6 Salvatore Costa - Catania 4. Determine correction factor (1)

7 08 Jun 2004CMS Week - Bonding WG7 Salvatore Costa - Catania 4. Determine correction factor (2) Correction factor: a = 1 / (2 sin ) (º) corr. factor a 102.88 201.46 301 400.79 500.65 600.58 700.53 800.51 900.5 For symmetrical bond:

8 CMS Week, CERN, 07-11 June 2004 08 Jun 2004CMS Week - Bonding WGSalvatore Costa - Catania Salvatore Costa Bonding in CATANIA Università di Catania and INFN – Sezione di Catania

9 08 Jun 2004CMS Week - Bonding WG9 Salvatore Costa - Catania Catania: bond accounting Module Type IB34IB12phiTotal Received from Gantry 7134105 Bonded453378 ARC tested443377 OK443175 bad22

10 08 Jun 2004CMS Week - Bonding WG10 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) cant 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

11 08 Jun 2004CMS Week - Bonding WG11 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

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