Current ILC work at Fermilab Electrical Engineering Dept.

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Current ILC work at Fermilab Electrical
Engineering Dept.
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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.

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• schematic with 2 possible connectors.

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• PCB layout on one layer with differential traces.

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

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

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Autocad 3D perspectives of Sipm/Pcb

• We have looked into placing the Sipms into a Pc
  board at different angles.

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• Different angles of Sipm in 2mm PCB

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• PCB with 3x3 tiles with only 4 tiles shown

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

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

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• Sip at small angle contacting fiber..

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• 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.