1. Layout for Fixel Readout Board fiber Holder The FRBH module will provide structure to the fiber assembly in the Fixel Readout system. header Pots, two rows along each side of board Power IO Pots, two rows along each side of board Power IO Pots, two rows along each side of board Power IO Pots, two rows along each side of board Power IO Pots, two rows along each side of board Power IO Pots, two rows along each side of board Power IO Pots, two rows along each side of board Power IO Pots, two rows along each side of board Power IO FRBHs - Gray

2. pot A 2x16 fiber cassette: PCB, connectors on back, SiPMs on front How the cassettes stack with interleaved rows readout on the opposite end Scale 2:1

3. Mother Board 2-Layer Holder Demo of single stacked holder “atom” Atom – smallest unit of holder, stacked mirrored from each other. They stack on top of each other, facing each other, to hold the fibers in place and line up the holes for mounting. Inner holes mount with cassette, outer holes mount with MoBo.

4. Demo of Slate Made by stacking atoms on top of each other Tab on top and bottom for further stability with MoBo. Mother Board

5. Exploded view of Mathematica “Cuboid” Structure *Not To Scale* FRBH Dim [mm]: 100 x 8 x 2

6. Exploded view of Mathematica “Cuboid” Structure *Not To Scale* Outer Rails Qty: 2 Dim [mm]: 100 x 2 x 2

7. Exploded view of Mathematica “Cuboid” Structure *Not To Scale* Inner Rails Qty: 2 Dim [mm]: 33 x 1 x 2

8. Exploded view of Mathematica “Cuboid” Structure *Not To Scale* Inner Vertical Dividers Qty: 1 ea Dim A [mm]: 9 x 2 x 2 Dim B [mm]: 12 x 2 x 2 Dim C [mm]: 8 x 2 x 2 Holes Qty: 2 Dim [mm]: 2 x 2 x 2 C B A