HL-LHC BGI - cooling infrastructure (EN-CV)

Thursday 18 Jul 2024, 10:00 → 11:00 Europe/Zurich

zoom (CERN)

Dominique Bodart (CERN), Frederic Borralho (CERN), Gilles Le Godec (CERN), Gunn Khatri (CERN), James Storey (CERN), Miguel Navarro Baeza (CERN), Olivier Crespo-Lopez (CERN)

Draft:

Present: Gunn, Miguel, Frederic

Discussion:

• @Frederic Borralho EDMS doc for Eng Spec of POLARIS power converter (EDMS link) where you will find cooling water requirement. 
• Here are the details from Olivier and Dominique on magnet cooling water:
  Inlet T: 27°C
  Inlet P: ~10 bars then piping PN16
  Delta P: ~8 bars
  Delta T: 28°C  (output around 55 degree) for magnet
  Flow rate for magnet: 20-25 l/min

• The email I sent to Olivier, also forwarded to you, is basically to request modification of all manifolds (for all 4 instrument) at the polint 4 during EYETS24-25. The ECR (EDMS 3070734) for this is already in circulation, I will add you for comment.

 

• Instrument cooling
  • 10W. Tapping to be done from magnets cooling circuit.
  • Instrumentation needed to be provided by SY-BI to EN-CV for designing and dimensioning cooling system (in addition to service pressure and temperature, flow, heat to be dissipated,...).
  • We will take the example of PS and SPS where we add a pressure regulator and temperature sensor on in and out of water pipe. I will add the detail in the indico page.

 

• Magnets cooling
  • @Dominique Bodart if we split the existing manifold from 2 pipes to 4 pipes, it simplifies the EN-CV work. Where the existing two pipes are used for the current doublet magnets. For the triplet magnets in future, we would need 3 pipes "aller" et "retour", and 4^th pipe for timepix instrument cooling. If this is ok, please let EN-CV know what would be the pipe diameter that you would like.
  • 3 magnets per instrument, therefore 6 cooling connections (compared to 4 we had before).
  • Dominique to provide heat to be dissipated.
  • Ideally, modification of water tappings and manifolds already installed so no further tappings are required (which would increase installation complexity and costs).

 

• Power converters cooling
  • Maximum power losses to air 3.6kW.
  • Converter water cooling requirements: see POLARIS spec Page 21.
  • Frederic has checked the EN-CV layouts of UA43 and confirmed that the 2 top main pipes are demineralized water. Tappings can be performed for Power Converter cooling.

 

 

Dominique Bodart email reply (19 Jul 2024):

Dear all,

 

Having the water distribution from 2 to 4 pipes is OK from the magnet side, however we should integrate insulating valves on the inlet and return side as well as drain plugs..

The usual fitting size is ½”.

Once we have decided which magnet type we go for, it will be simple to give instructions. The main reason is that the combined triplet magnet (similar to PS) has only 1 inlet / 1 outlet instead of 3 inlet / 3 outlet in the case of 3 independent magnets per instrument.

If you need more info, please contact me.

Cheers,

Dom

10:00 → 10:20 Cooling water need for magnet, instrument and power converters

Speakers: Frederic Borralho (CERN), Gunn Khatri (CERN), James Storey (CERN), Miguel Navarro Baeza (CERN), Olivier Crespo-Lopez (CERN)