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6/2-008 (CERN)
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Lukas, cleaning, harpy, 4Qs sidebands
Dominik sidebands at 10% level are reviewed and actually they correspond to few BPMS having 50% 4Qs sidebands. To clean these BPMs SVD mode should be reduced to 0.4 svd dominance cut. Maybe svd should be still above 0.7, and avoid longitudinal blow-up, which seems to be key.
Update presentation with list of 7 bad BPMS -> Lukas
Did isolation Forest clean these guys? Yes.
What to do with SVD, remove modes or remove BPMs?
Should we rerun SVD after all bad BPMs are cleaned?
Test redoing optics calculations without the bad BPMs to check differences -> Elena
Scaling versus turn number is ok for harpy.
For peak-2-peak display in multiturn should restrict to 4 non-ATS arcs. -> Mael
Update on different pairs phase advance uncertainty -> Andreas
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Michael, beam tilt
Formula for angle tilt fully debugged for coupling.
It explains Georges observations with about factor 2 emittance ratio! -> email to Georges
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Tobias, Report from Tobias
Concerning tune trims at injection they were fully correlated between them, unrelated to energy matching.
Maybe FIDEL? Anyway good news for coupling (Delta is kept constant)
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Jacqueline, SKEKB data
SKEKB has discrepancies between dp/p from BPMs or from RF frequency.
What about LHC? -> Jacqueline
Increase tune tolerance in OMC3 to avoid too many BPMs cleaned -> Jacqueline
Rather bad BPM calibrations!
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Leon, k-modulation, precise orbit
Improvement on offset measurement is done via removing data with low signal.
It seems now we can measure crossing angle below 10% -> Leon
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Andreas, PETRA MD
MAF filters were key to have good data!
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