CMS Tracker Week, CERN, 24-28 Oct 2005

25 Oct 2005CMS Tracker Week - Bonding WGSalvatore Costa - Catania

Salvatore Costa

Bondingin

CATANIA

Università di Catania and INFN – Sezione di Catania

25 Oct 2005CMS Tracker Week - Bonding WG 2 Salvatore Costa - Catania

How bonding is going• Our new (well, used, rented) Delvotec 6400 still bonds well• We have renewed our leasing for 2006 to do the TEC prod• At turn-on after summer vacation, found 2 electronics boards (Y, Z)

dead replaced by factory, no charge, 1 week downtime• Modules bonded so far with this machine: 180 / 360• Some peculiar Module failures connected with Bonding:

– Seen first module where gold layer on HV pad on back is peeling away. May drag away the bonds with it: Module declared faulty Repair center

– Since Sep we see many PA’s where bonds would not stick in one of these locations: • 1-2, 27-30, 738-741, 767-768 • Seen also in Bari. • Suspect bad PA metallization in those (symmetric!) spots

• DEAD channels (plagued us with Hughes): still zero so far• Pull forces still satisfactory: PA TA ~10-11 g, PA-Sen ~12 g

25 Oct 2005CMS Tracker Week - Bonding WG 3 Salvatore Costa - Catania

Recent PA-Sen pull forces