Mockup of the IFVTX

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In order to study the options for cabling between the picture planes and the ROC boards, I made a mockup of the IFVTX detector and the ROC boards.

In this picture, 3 stations are mounted, the smaller first station is missing.

A rectangular transition board is shown, which receives all cables from the IFVTX stations on the side facing away from the camera, and Kapton cables would go from the visible side to the downstream end of the ROC boards.


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This shows the connector face of the ROC boards. Only 4 of 6 would be needed. If Kapton is used, folds or custom bends are needed.

The 4th board shows an option using flexible twisted-pair ribbon cables. The blue arc is the location of the gas seal. 6 connectors are placed at 60° angles along the bottom edge, and cables are constrained to not cross the center line of the board. The arrangement would be mirrored on the top half. The height of the bundle exiting the board is 14mm.

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Since we only need 4 ROC boards, we can make them a little bigger. This model shows a ROC board that spans a total of 45°. The 12 cables come up the center line. The highest point of the cable stack in this picture is ~22 mm. If this needs to be reduced, one can split the ribbons of say the top 5 cables, and push them to the sides of the connectors, thereby reducing the maximum thickness.


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Inputs used to make the model:
ROC boards
We need 4 for the IFVTX. The back surface of the ROC board is at 373.2 mm, leaving 22.8mm for components and cables, plus 4mm for the (I)(F)VTX outer enclosure.

Updated drawing of the FVTX ROC board, with inner radius at 195 (was 188) mm.
z-positions of the station center planes:

Station z-position
1 201.1 mm
2 261.4 mm
3 321.7 mm
4 382.0 mm

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Picture frames. These are mounted back-to-back, offset by 6mm in y.

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Here is an updated mechanical drawing of the board.





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