Permanent magnet for HL-LHC BGI #2

Name: Permanent magnet for HL-LHC BGI #2
Start: 2023-09-19T10:30:00+02:00
End: 2023-09-19T11:30:00+02:00
Location: CERN

Tuesday 19 Sept 2023, 10:30 → 11:30 Europe/Zurich

866/2-D05 (CERN)

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Participants: James, Pierre, Dominique, William, Gunn

Dominique presented alternative solution: instead of permanent magnet, to use existing 0.7T solid yoke magnets (MDXL ?), there are 35 of them spare.
Link to the database of magnets: https://norma-db.web.cern.ch/magdesign/idcard/1905/
These magnets are based on single iron yoke (instead of thin iron sheet stacked, this affects speed of eddy currents when switching the magnets )
Looks like the overall external dimention of the magnet is smaller slightly than the existing magnets in LHC for the BGI
The magnets are then cheap but there is still cost for power converter and the long leadtime (SY-EPC, Gill to confirm on voltage/current)
We may even be able to use triplet configuration if necessary (Dominique will check the offset in proton beam due to doublet)
William will do some studies of instrument fitting in the magnet bore (mechanical integration)
Gunn will do Virtual IPM simulation to check if the field homogeniety is good enough
We agreed to meet in a month for a followup

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