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The ITk pixel module cooling Twiki page is the main source for the common information. This page captures the local module cooling setup information at the SLAC Integration site. A talk by Magne Lauritzen (Jul/7/2020) has some updated status and additional pictures.    

Quad Cooling Unit Component Collection Status

Shipment from Bergen (received)

  • Vacuum chucks x 2 + spare gasket
  • POM bottom plates x 2 
  • Coldplates x 2

Shipment from CERN

The following items are listed by names and counts from each box of the entire package from CERN. For example, there are 6 POM base plates in total, but they came as sets of there in two separate boxes. Pictures will come soon.

  • Data cables for triplets RD53a ITk Pixel (x3)
  • POM base plates (x3)
  • POM base plates (x3) + coldplates for triplets "linear type" (x3) + vacuum chucks (x3)
  • Triplet adapter cards RD53a ITk Pixel (x6)
  • Plastic screws: RENY; NYLON M3x35, M3x25, M3x40, washers (check count for all the items) + coldplates for triplets "ring type" (x3)
  • Foam insulation sets: Linear type (x3), Ring type (x3), presumably Quad V0.4 (exact type is not labeled, actual purpose to be checked) (x2)
  • 25m coolant tubes
  • 5m dry air / vacuum tubes







They're being shipped from CERN 12/11 https://edh.cern.ch/Document/8559982 together with the Triplet Cooling unit. 
Some notes from Saverio:
-- M6 bolt are 10/32 - we need to find more here.
-- The coolant tube is slightly shorter
-- There are spares for all the screw types and the vacuum chucks rubber pads have been already cut 

Items to be acquired by INT site 

  • Peltier devices (see the summary of this presentation for recommendations and page 13 for the list of alternatives): Module 1 and Module 2 (one of each per cooling unit).
  • Panasonic EYGS0909ZLX2 TIM sheets (2 sheets 4x4cm2 per cooling unit)
  • Temperature sensors (NTC or PT100s, see assembly manual)

Operation Instructions

E-mail from Magne Lautitzen to atlas-itk-pixel-modules-TestSystem (Oct/26/2020): 

To operate the cooling unit, you will need the following infrastructure:

  • Vacuum source
  • Dry air or nitrogen source
  • Circulating chiller
  • Peltier power supply and/or controller

The amount of dry air or nitrogen needed to maintain a dry atmosphere in the cooling unit will depend on the humidity in your lab and the lowest temperature you want to reach on the module. A ballpark figure is 1.5L/min at -25C.

The circulating chiller must have a cooling capacity that depends on how cold you need to take the modules. See page 13 on this presentation for recommendations for reaching -55C.

For stable temperature control of the modules, you will need a peltier controller. I  have been successfully using the Meerstetter 1089.


To avoid condensation on the peltier devices, you must maintain a dry atmosphere in the cooling unit whenever there is coolant flowing through the coldplate. If condensation forms on the peltier devices, it will degrade the performance of the cooling unit because ice and water is an excellent conductor of heat. Getting rid of this condensation requires a long term “bakeout” of the coldstack and is best avoided.


 










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