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Revising data and status
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Europe/Zurich
6/R-012 - conference room (CERN)
MCS, Benoit
b3 dipole correction almost verified in Arc 12, vertical tune a bit off. MCS quality to be evaluated (maybe 10% off).
Other arcs to be measured.
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Beta-from amplitude, Ana
Rather good agreement before corrections.
After corrections differences are apparent.
We should look at the difference b-from-phase and b-from-amplitude and looks at the outliers to identified bad BPMS.
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Non-linear chromaticity, Ewen
Q'' and Q''' a bit larger than in 2011-12
Small discrepancy between "radial loop error" and "radial trim" -> Ask Jorg or Giulia
New corrections calculated with better data: Beam2: MCO 2.48 m^-4, MCD + 1706.8 m^-5.
Corrections are larger by 46% and 30% in 2012 (but MCD trims are lower!).
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Chromatic coupling, Tobias
Already nice measurements for chromatic coupling in Beam 2. Phase clearly changed between 2012 and 2015!
And amplitude seems smaller.
In the normal coupling there are 2 jumps. Is it orbit? else, do a global correction?
Amplitude detuning to be compared with 2011 measurements.
Coupling versus kick amplitude without not much change, but no octupoles.
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Line (-1,-2), Felix
Line appeared in beam 1 too.
Bug fixed in GetLLM with finding right BPM pair.
Calculate terms from complex spectrum might be more accurate.
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N-BPM method, Andy
Problem at the edges with the beta-beat was actually prepared in the code. Now this fix becomes default.
Try/except in python generated some large error bars, to be followed up with Jaime.
Agreessive cleaning seemed required.
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PSB, Meghan
Lots of electrical noise
66 khz new line, but looks real.
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Action-phase jump, Carolina
IR BPMS are not used now. Simulations show it is possible to use only arc BPMS.
Goal is to compare action phase method to segment-by-segment
Need to learn new sbs.
-> Lukas will help Carolina to regard sbs and action-phase
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GUI, Jaime
default directories for b2 syst coming.
Optipons for SVD, missing large p2p cut.
Quadrupoles displayed in sbs.
Automatic cleaning to be further investigated.
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