Patch Panel 1 (PP1)

1
Patch Panel 1 (PP1)

• Brief Review
• Cost and Effort Estimate

2
Patch Panel 1
TRT Forward
TRT Forward
SCT Barrel
Services and Beam Pipe Support Structure
Services and Beam Pipe Support Structure
Pixel Detector
Side C
Side A
3
PP1 Region Functions

• Cooling connections
• Electrical connections
• Optical fiber connections
• N2 connections
• Complete gas seal
• Complete electrical shield

PP1 Region
lt- Towards IP
PP1b
PP1a
4
PP1 Requirements

• Provide cooling, electrical and fiber connections
  as specified in ATL-IP-ES-0007(Pixel Services)
  and described in ATL-IP-ES-0072.
• Gas seal for 4 mbar maximum pressure differential
  consistent with 6 l/mbar-hour leak from the pixel
  volume.
• Penetrations for cooling pipes to allow up to 3mm
  contraction from room temperature to cold
  temperature.
• Access to beam pipe adjustment allowance for
  beam pipe survey.
• Cutouts for PST rails to allow pixel package
  insertion.
• Outer diameter consistent with insertion of pixel
  package with PP1 attached to service panels
• Electrical connection to PST and beam pipe EMI
  shields.
• Temporary support of beam pipe during
  installation of the pixel package.

5
PP1 Endplate

• Picture of prototype endplate. Machined aluminum,
  6mm thick.

Slots for fibers
For cooling and gas connections
Seal plates
Slots for electrical feedthroughs
For beampipe support and adjustment
6
Coolant Fittings

• Lack of space, the need to allow contraction of
  the pipes and minimize forces on the endplate and
  the need for an electrical break requires us to
  use a custom fitting.

PEEK insert electrical break
PEEK seal to pipe
Threaded insert into endplate
Tube flared in place
PEEK nut
Bellows for contraction of pipes upon cooldown
7
More Coolant Connections

• Commercial fittings at PP1b desired but not yet
  selected
• Filter between PP1b and PP1a, also not selected.
• Custom wrenches for PP1a are needed (under
  design). Space is very limited.
• Same for PP1b? Not clear yet

8
Electrical Feedthroughs

• Fabricated for simple functional tests and for
  mockup.
• Connections to PP0(largely already made on
  prototype)
• Thermal tests
• HV isolation
• Add PP1b connectors, read out real modules

9
Optical Fibers

• Ericsson study of MT16 connectors with bare
  ribbons on the PP0 side and corresponding
  cables on the PP1a side.
• Mechanical(glued) interface to PP1 endplate slot.

10
PP1 Prototype

• Plan is to make enough coolant fittings for one
  quadrant.
• Custom bellows ordered
• Other parts either ready to order or sent to
  shops.
• Would then assemble into quadrant of prototype
  endplate to get experience.
• Current plan is to use paper(rad-hard and cheap)
  gaskets for seal. Will test this idea in small
  setup also after irradiation, in addition to full
  scale.
• Would mount endplate as shown with coolant
  connections(and blanked off electrical and fiber
  connections) to measure leak rate attached to
  30cm PST prototype with flanges. Repeat after
  adding electrical connections.
• Fiber plan not yet clear scope of Ericsson
  prototypes not likely to fill all of slot.

11
Mockup at CERN

• Assembly started

12
Cost and Effort Estimate
Included in estimate

• Bulkhead
• Bulkhead seal ring and gasket
• Bulkhead center support, bellows, connection to
  beam pipe
• Coolant pipe feedthrus (supply and return)
• Striplines
• Corrugated support for PP1b electrical cable
  connectors
• Full prototype of one PP1 quadrant
• Contingency

Not included in estimate (as they are in other
cost estimates)

• Fiber optic cables
• PP1a fiber optic cable feedthrus
• PP1a beam pipe adjusters
• PP1a to PP1b coolant pipes
• PP1b coolant pipe connectors
• PP1a to PP1b electrical cables
• PP1b electrical cable connectors
• PP1b filter/pressure drop devices

13
Cost and Effort Estimate
14
Conclusion

• Preliminary design of PP1 and related items well
  advanced. More work is needed to complete design.
• Prototypes of critical components either
  fabricated or under fabrication.
• 1-to-1 mockup assembly started at CERN
• Next major steps are to complete quarter-scale
  prototype and to finish mockup studies.
• Preliminary cost and effort estimate
• Total cost 472K
• Total effort 27 FTE-months