Draft by Gunn (Please add/edit as needed)

Present: Giuseppe, Cesar, WIlliam, Chiara, Teresa, James, Mark, Gunn

Gunn/James/Mark:

• kickoff meeting between SY-BI and TE-VSC in terms of HL LHC BGI project (resuming after long pause)
• LS3: 4 instruments to be installed, 2 on the left side (horizontal and vertical BGI) & 2 on the right side (horizontal and vertical BGI) of point4
• Compact triplet magnet design chosen by D. Bodart (TE-MSC), Vacuum chamber design/optimisation in progress (SY-BI)
• Magnet will hav epossibility to slide longitudinally to access instrument flange and for bakeout
• New new gas injection systems (on eon each beam), not needed for HL LHC baseline operation but useful for potential halo measurements.
• EYETS 24-25: no vacuum installation foreseen

Giuceppe/Cesar:

• Envelope/layout/location should be provided (including step file of the magnet design from TE-MSC)
• Need to consider heating jacket/tape and insulation around the vacuum chamber
• Bakeout must be done at least at 120 degree C, more the better
• INFN-Ferrara's 4DPhoton ceramic feedthrough should be tested for outgassing as it is now
• Keep DN80 flange on two end of the instrument flange connection to the LHC beam pipe
• Carbon coating of the interior of the vacuum chamber reccomended to avoid electron cloud
• Timeline wise, intruments should be installed by Q4 2027
• Latest the magnet should be erady by Q3 2027
• Note that cryo cooldown in Point 5 planned for Q4 2028

William/Chiara/Teresa:

• Design of the instrument in progress (changing from round to recatngular chamber), Teresa presented 3D models
• As soon as a 3D design of the chamber is ready, it will go through RF impedance simulations
• SY-BI-ML will come to TE-VSC with the final instrument design probably by end of 2024
• We keep the same 1.5 m beampipe length