PCB layout issues PCB alignment and spacing MMM meeting, 22/01/2014G. Sekhniaidze/ J. Wotschack1

Proposal for board segmentation I (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 Alignment holes 200+ µm MMM meeting, 22/01/2014G. Sekhniaidze/ J. Wotschack2

Proposal for board segmentation II 1 (?) (1) 2047 (1023) 2049 (1) 3072 (?) 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 stereo panel PCB 6 PCB 7 PCB 8 Alignment holes 200+ µm MMM meeting, 22/01/2014G. Sekhniaidze/ J. Wotschack3

Strip pitches for eta & stereo layers MMM meeting, 22/01/2014G. Sekhniaidze/ J. Wotschack4 p P’ p  Effective strip pitch p’ is slightly larger than p if the same pattern, just rotated, is used for eta and stereo boards  ‘Corners’ of two external PCBs are not covered (approx. dimensions d ≈ 25 mm – 5 mm); to fill these areas need more strips (channels)  Using the same number of strips (channels)/board we need a slightly different strip pitch p for eta and stereo boards d