1. Current ILC work at Fermilab Electrical Engineering Dept.

2. 64 Tile prototype Sipm/Pcb We have looked into a simple design for a Pc board. It contains 64 Sipms and 4 temperature sensors. 8mil trace with 8 mil spaces.

3. schematic with 2 possible connectors.

4. PCB layout on one layer with differential traces.

5. For our first approach we select a Microstrip design with 2 layer PC board.

6. 51 ohms when using 8 mil trace, half once copper and 5 mil thick height.

7. Autocad 3D perspectives of Sipm/Pcb We have looked into placing the Sipms into a Pc board at different angles.

8. Different angles of Sipm in 2mm PCB

9. PCB with 3x3 tiles with only 4 tiles shown

10. Single tile from top with fiber bending and Sipm exposed at edge of board.

11. Tile from side shows a fiber terminating on an Sipm and beginning midpoint on other side. Fiber meets at angle with some light loss.

12. Sip at small angle contacting fiber..

13. We are currently producing a mock up of the 64 tile board with 4 different test holes for the Sipm. It appears that there are no real difficult electrical problems. We are looking at some of the limitations to the mechanical assembly.