Update from BI (including actions from last meeting)

• Diogo Miguel Louro Alves (CERN)
• Leander Grech (University of Malta (MT))

Room: Skype

Update from OP

• Michi Hostettler (CERN)
• Jorg Wenninger (CERN)
• Andrea Calia (CERN)

Room: Skype

BPMR.5L8.B2 Room: Skype Quoting M. Krupa: "The cryogenic Beam Position Monitor BPMR.5L8.B2 installed within the cryostat of the standalone quadrupole LQNMA.5L8 has developed a nonconformity leading to the loss of reliable beam position measurements in the vertical plane. A direct intervention on the faulty BPM has been excluded as it would require delicate and non-standard handling of the magnet. It is therefore proposed to install a new warm BPM adjacent to the LQNMA.5L8 in the LHC vacuum sector A5L8.R. A cold BPMR.5L8.B2 could not be used during the Run 2 due to a major asymmetry in the vertical plane. During LS2 we confirmed that the problem is caused by the cabling inside of the magnet cryostat. Unfortunately, fixing this problem would be extremely challenging so it it was decided (by BI, TE/MSC and LMC) that a better solution would be to install a new warm BPM just next to the magnet. The idea is to completely disconnect the BPMR.5L2.B2 and reuse its cables and acquisition electronics for the newly installed BPM. The BPM will be of a different type (BPMWI instead of BPMR) and at a slightly different longitudinal position so the calibration coefficients / polynomials and the layout database will need to be updated. So far I have focused on the hardware aspects of this intervention but I would like to check with you if you see any problems concerning the BPM software and / or the orbit feedback system?"

Planning Room: Skype

AOB Room: Skype