Current ILC work at Fermilab Electrical Engineering Dept.

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.

schematic with 2 possible connectors.

PCB layout on one layer with differential traces.

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

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

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

Different angles of Sipm in 2mm PCB

PCB with 3x3 tiles with only 4 tiles shown

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

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

Sip at small angle contacting fiber..

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.