1. Tapes and Integration of Powering (endcap) Pepe Bernabeu (IFIC) Valencia/UK - Experience and future collaboration on staves/petals, June 17 th 2010

2. DET1 DET2 DET3 DET4 DET5 DET6DET7 DET8DET9 H1 H2 H3 H4 H5 H6H7 H8H9 H10 H11 16 20 12 16 88 Powering Too many flavours of hybrids Each with different number of chips Not adequate for Serial Powering Endcap goes for DC-DC option Learn from barrel experience and contact DC-DC group Number of 128-ch chips per hybrid

3. HV HV connection problem on paired detectors Access for connection on opposite side, HV lines routed on hybrid Propose to bias several detectors in parallel (2, 4, 6, ?)

4. DET1 DET2 DET3 DET4 DET5 DET6DET7 DET8DET9 H1 H2 H3 H4 H5 H6H7 H8H9 H10 H11 16 20 12 16 88 Hybrids 11 different hybrids in one petal ! Chips don’t fit on two hybrids ! (small strip pitch) H1: Det width 71,7mm not enough H3: Det width 93,5mm not enough 128-ch to 256-ch chip Barrel option is not the best for endcap Access to paired hybrid only one side Power side or TTC/Data side Propose to join paired hybrids in one Need to study feasibility

5. SMC Unexplored area for endcap Geometry Position (ear, hat, …) Interface to bus cable

6. Bus cable Up to now is barrel-like Under detectors Alternative is two bus cables (power and TTC/data) on each side Wider petal 24 and 15 mm bus cables If paired hybrids are joint, narrower If HV detectors in parallel, narrower Less material Factor 6 reduction Cooling gets better