BGV Integration Follow-up Discussion

Monday 17 Oct 2022, 15:00 → 17:00 Europe/Zurich

Main worries identified: 

• Collision with survey reserved space (cooling coming from the roof: could be a showstopper!, maybe the vacuum gauge too, depending on its type);
  • Cooling power needed still under investigation; if we need cooling water <27 degree, a solution needs to be found to route it from the gallery to the detector without compromising survey needs to align the machine in the BGV areas.
• Collision between largest ring and B2 bake-out jacket: see with them if this is a problem (B2 beam pipe bake-out not possible when the detectors are in place).
  • No direct answer yet, to be asked.

 Tasks list:

• BGV team: Ask Thibaut to confirm if we can remove BQK (possibly BPLV too?)
  •  Helene had email confirmation from Thibaut that the BQK H and V will be moved to point 1 or point 5. Nothing concerning BPLV.
• BGV team: ask VSC 
  • If a new sectorisation should be done; if so how much would it cost
    •  No sectorisation is not a showstopper; it seems that there is very little space to do it and it would greatly increase the costs. 
  •  If no new sector for the BGV: How often may this sector need to be baked-out due to other equipment in place? 
    • No direct answer, but it didn't seem to be a worry. The vacuum sector is already quite short.
  •  If the impossiblity to bake-out the B2 chamber while the detector is in place is a worry (how often would B2 chamber need to be baked-out)
    • No direct answer yet, to be asked.
  •  What type of gauge would be installed on the tank; try to keep it out of the survey reserved space (current solution for the demo: 90deg elbow)
    • No direct answer yet, to be asked, but a similar solution than on the demo could be done.
  •  What level of ancillaries is required by VSC (place needed, for bake-out equipment and pumps: required power, is it sufficient at the new location -> contact EN-EL: Nuno Dos Santos)
    • No direct answer yet, to be asked.
  •  How much longitudinal space they wish to make the interface btween the BGV and neighbour equipments
    • No direct answer yet, seems to be ~200mm according tothe distance between equipments on the layout .
•  Teresa: 
  •  Adjust the exact longitudinal position of the instrument once this is fixed. 
  •  Also consider machine coordinate system: 1407, and that the integration models are in 1401. A change of reference system from 1407 to 1401 must happen. 
  •  Include vacuum gauges in both flanges of the vaccuum tank (even though it´s just needed one, the other is spare). 
  • Check supports accessibility for adjustment purposes. 
  • BGV team and Teresa: discuss with BE-GM how to include alignment targets: discuss the rigidity of the support of the target and see what is needed from survey point of view (preliminary: just identify possible problems and showstopper; a more detailed study can be done after the review). The geometers must be placed inside the red volume to allow alignment during operation. 
• BGV team, Teresa: estimate place needed for detector readout and cables; possibly include it on the drawings
• BGV team: share any feedback on the Integration note; maybe start thinking of gallery aspects, although no showstopper is expected there