1. Givi Sekhniaidze1 CERN, 25 March 2014

2. Givi Sekhniaidze2 The angles for the chambers are: LM1 – 33.307° LM2 – 7.224° SM1 – 21.521° SM2 – 20.161° Do we stay with this angles, or with more “human” numbers (0.5° or 1° step)? Small and large sectors will have the different pitches for the strips (450 μm for LM and 425 μm for SM) The PCBs will NOT have the equal height: For intermediate PCBs (PCB2,3,4 for LM/SM1 and PCB7 for LM/SM2) it will be calculated as 1024 x Pitch (460.8mm for LM and 435.2mm for SM) The rest of the module height will be equally distributed between external PCBs The height of the external PCBs will be slightly larger then intermediate (example: 474.4mm vs. 460.8mm for LM2), but due to the spacer/mesh frame (25mm minimum) the active area will be less. CERN, 25 March 2014

3. Givi Sekhniaidze3 Proposal for PCB alignment (MSW version) Assembling holes Precise hole Precise slot CERN, 25 March 2014 D We propose to have one pair of the precise hole and slot in the central part of the PCB Precise hole will be used ONLY once during positioning on the gluing table In the hole could be glued precise insert (Inox, PEEK, etc.) for alignment of the panels

4. Givi Sekhniaidze4 Proposal for multi-PCB alignment 3 board version Precise holes in the table Panel assembling table CERN, 25 March 2014

5. 1 1023 1025 (1) 2047 (1023) 2049 (1) 3072 (1024) Strip counting Two missing strips: Strip# 1024 and 2048 Connection to electronics PCB 6: last strip not connected PCB 7: last strip not connected PCB 8: all strips connected What to do with not connected strips on the electronics side? Example: 3-board eta-strip panel PCB 6 PCB 7 PCB 8 200+ µm Givi Sekhniaidze5 Proposal for board segmentation CERN, 25 March 2014

6. 33 1023 1025 (1) 2047 (1023) 2049 (1) 3040 (992) Strip counting ~66 missing ETA strips: Strip#1-32, 1024, 2048, 3041-3072 Only 2 missing STEREO strips Connection to electronics PCB 6: first 32 and last strip not connected PCB 7: last strip not connected PCB 8: last 32 strips not connected What to do with not connected strips on the electronics side? Example: 3-board eta-strip panel PCB 6 PCB 7 PCB 8 200+ µm Givi Sekhniaidze6 Proposal for board segmentation (update) CERN, 25 March 2014

7. 0.2 0.9 0.45 0.3 Ø3.5 Givi Sekhniaidze7 ETA board layout (LM chambers) CERN, 25 March 2014 Interconnection hole

8. Givi Sekhniaidze8 Assembling holes for LM2 chamber CERN, 25 March 2014 As an example, part of the PCB6 from LM2 chamber The assembling holes are equally distributed in active area Only one hole in the center of the connector area

9. Givi Sekhniaidze9 MMFE MMFE board and spacer/mesh frame The dimensions of the MMFE board will be 50mm x 215 mm The space between spacer/mesh frame and edge of the R/O board – 55 mm (50 mm MMFE width + 5 mm clearance) CERN, 25 March 2014 NSW MSW

10. Givi Sekhniaidze10 Assembling holes in connector area Preferable position for assembling holes w.r.t. connector would be in the center of the connector (free space between two Zebra connectors) Assembling holes Zebra connectors R/O strips CERN, 25 March 2014

11. Givi Sekhniaidze11 Summary The draft version for the PCB layout is ready – Missing the routing for the Zebra connectors – need position of the holes – Number and positions of the interconnection holes to be decided a.s.a.p. – Final decision about dimensions and the shape of the spacer/mesh frame (combined or separate) is needed to finalize the PCB design (resistive strips, HV distribution, pillars, etc.) Alignment method for the PCB positioning – MSW version, other suggestions? Other targets/images for in-plane alignment to be implemented in PCB design? Other wishes, ideas, suggestions?