TPOT

(TPC Outer Tracker)

PAC presentation 22 Jun 21
Transition card and cables
Fusion project to surface
Panel-w-fee-board.easm
Jan 22 presentation
TPOT review 26 Jan 22, Mechanics
Insertion Assembly
vol STL

OK, new sketch:

Bottom left connects to the micromegas, using connector MEC8-135-01-L-DV-A. Top right goes to the FEE. 

  From Takao:
  1->A, 2->B, 3,4->C,D or D,C
This is a ×2 model of the connectors. Here, only the top 4 cables are in place.

Note there are 4 different cables

The FAB got centered on the pair of DABs
(new figure)

Top 4 cables are placed

Note there are now only 2 different cables needed. They are connected such that they are closest in length.

The zigzag in the ribbon cables can be achieved by carefully cutting the individual leads between the red lines. Then the cable can be shaped as needed.
Another simplification: make the FAB boards so wide that each of the blue cables is straight. The price is that the next FAB over is different: a mirror copy.
A: cables perpendicular to boards - not possible

B: The red lines show cable paths parallel to boards

C: Cable lengths between the board edges (blue lines), where the bending radius of the rh cable is 7mm.

D: Bending radius is 3.175 mm. Using this for the outside cable minimize the total height. Note the attachment points (red) do not necessarily lie opposite each other. So the inner cable can attach lower, and can be bent at any convenient radius.

Jan 2022

(31 Mar 22)

Actual cables, spaced ~1.6mm apart. There is a ~4mm difference in where the cable ends end up on the transition boards.

Card edges are indicated by green arrows. The distance between the boards is 75mm, and the length of the bottom cable between the green arrows is 78mm. The top one is 3-4mm longer.

If I force the cable ends to be equal on the transition board, the cables touch where they make the 90° turn, and the bottom cable bulges out on the bottom
If the assemly is done on a flat surface, the top cable needs to bulge out a bit.