Installation and Integration/ActionItems/Cables

Cable routing decision

There are currently two potential options:

1) Route the cables from the lower APA up "along" the upper APA frame.

2) Route the cables down to the floor of the cryostat all the way to the walls and up the walls.

Information on current status

APA Dimensions

• APA opening dimensions (usable): 44mm x 63 mm = 2772mm² (constrained by foot tube opening -> Cannot be larger to have enough space for glueing/soldering wires on the foot boards)

Actual dimensions: 70mm x 95mm = 6650mm² (see below for drawings)

• Occupancy: -> 2881mm²
  • PD: = 441.8mm² :
    • From Dave/Leon:
      • PD cables have spec diameter of 6.9mm, but in reality, due to uniformities, they are between 7.5 and 8 mm => area = 44.2mm²
      • 5 PD cables = 5 x 44.2mm² = 220.4mm²
      • 10 PD cables= 441.8mm²
      • NOTE: the PD heads are 18.5mmx18.5mm = 342.25mm² , but it's NOT included here since it takes space only inside the tube and doesn't not go through the foot tube opening

• • Support bar = 13mmx40mm = 520mm², since it can be added after the cable routing, it's NOT included in total

• • Potential CE cables, 20 data cables + 20 LV cables, but only 10 of each to pass by APA sides
    • Data cables: Width=21.4mm, Thick=4.06mm = 86.88mm²
    • Data cable connectors: Width = 26.04mm, Thick: smaller than the cable bundle thickness = 105.72mm²
    • LV cables: Width: 22.86mm, Thick: 2.54mm = 58.06mm²
    • LV cable connectors: Width=24.33mm, Thick=8.97mm = 218.24mm²:
    • If bundled 10 Data + 10 LV per APA side= 1449.4mm² (with connectors = 3239.6mm²)
• Missing 110mm²! That's 2 LV cable connector areas. Which means that if we extract the bundle from the cold cables not in one big bundle of connectors, it might be doable.

Drawings:

Cable size

• PD cables (Cat6): 9-10 mm diameter + PD head (18.5mm x 18.5mm). 5 cables per APA -> 10 cables in upper APA

• Cold cables: Max length = 25m (validated length for Gore), 20 CE cable pairs per APA (can they be split for each side of APA frame? -> 10 CE cable pairs per tube?)

-> CE cable pairs = blue data cables (26mm wide connector) + black-white LV cables (16mm wide connector)

Cable routing plan for protoDUNE

Dimensions: 7m wide x 6m high

Concerns and questions

• How difficult is it to bring the cables up (in or on?) the APA frame? How long are the cables? What type of access we need to pass the cables through?

• Are there any mechanical difficulties to pass the cables up the APA frame? Weight? Space?

• Grounding and Shiedling: Can we bundle the cables together? Do we need mechanical/electrical separations in the APA frame?

• If we go along the cryostat wall, we need longer cables. What is the impact of longer cables on readout? Procurement?

• Is there anyway we can attached the cables on the cryostat wall? At the moment there is no mechanical device on the inner cryostat membrane. The space between APA and membrane is ~15cm. Need to take the weight of the cables into account in this design solution.

Group interface

• Inst.& Int.: Roxanne, Bill, Marvin
• APA: PSL (Lee and Dan) and Daresbury (Jo)
• PD: David, Leon and Gary
• CE: Matt

Potential testing sites

• Ash River (contact: Bill)
• Daresbury (contact: Jo)