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WP8/WP12 - Installation of CMS VAX service lines (sequencing, placement of supports)

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530/R-030 - BE-EA Conference Room (CERN)

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CMS - WP8/WP12 - Installation VAX service lines
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NOTES from Francisco:

Presents: Josef, Andrea, Boki, Edward, Oliver, Francisco

Excused: Maria, Frederic

LHC planning (reference shown by Oliver), will only cover installation required for the commissioning. Vaxbox and M2/M3 will be included in Experiments closing sequence and discussed between exps and VSC. Mention to M2 & M3 to be removed. The planning wil not be very granular on purpose. A detailed planning will be done for the removal and for the installation periods.

Need to install a supporting back structure for the FIN machining right after the removal of the TAS. This structure remain inside the FIN during LS3 and will be removed as first step of TAXS installation.

/Andrea commented that the FIN will never be realigned , this relaxes the requirements for fixing support of piping at the LHC side. Jaime confirmed that the holes will be positioned within around 20 mm precision, no new holes are foreseen in the concrete to avoid dust.

Jaime asked how to provide the information:

1- Edward prepares the model with the supports

2- Frederic will add the corresponding holes to the FIN and will define the reference positioning for machining

3- The model will be sent/crosschecked with CMS. [A. commented that as it is at the tunnel side, no real need to crosscheck)

Oliver asked whether WP12 wants to profit from the mockup for the installation of lines. Jaime confirmed but not with the final lines.

The small drilling (threaded holes) inside the FIN will be done as second step of TAXS installation.

Josef asked for a modification of the position of the supports for transporting the Vaxbox, [Accepted]. He also asked for reference points for the survey of the vaxbox, [Already foreseen] 

Jaime asked who will do the installation of the compress air inside CMS (connecting the VAX to the feeding of the GIS)--> No one in hand or contacted from VSC/CMS/EA. 

 

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Comment from: Andrea Gaddi <Andrea.Gaddi@cern.ch>  To: Francisco Sanchez Galan <francisco.sanchez.galan@cern.ch> (Cc: ... all invited ...) sent: Thursday, 17 July 2025 10:28
Dear Francisco, As for the last sentence in the notes - compressed air for the VAX assembly - I suggest that it is included into the VAX services integration task.
As mentioned by Josef, a compressed air line is feeding the GIS, we could extend it from there (adding a buffer tank, if needed to avoid excessive pressure drops when operating the valves).
Cheers, Andrea 
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Comment from: Josef Sestak <josef.sestak@cern.ch> To: Andrea Gaddi <Andrea.Gaddi@cern.ch>; Francisco Sanchez Galan <francisco.sanchez.galan@cern.ch> (Cc: ... all invited ...) Sent: Thursday, 17 July 2025 10:33

Dear Andrea, Thank you for the comment. Yes, on the level of the GIS we will accommodate the compressed air buffer volume (bonbon) with forward feed valve, so the valves stay operational also in case of any issues on infrastructural network. This is standard approach we are using now for all experimental sector valves. Cheers Josef

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