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2016 MD1 preparation
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Europe/Zurich
6/R-018 (CERN)
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Lukas, ESRF
new data with lower amplitude (kick is half of the smallest from previous experiment).
Synchrotron motion is seen, oscillation with period of 200 turns.
Acquisition had some issues, some files might report data from previous files.
BPM random errors 10-20% smaller than in previous exp.
Taking the ORM model as reference the systematic errors to explain measured beta-beating are very small.
Very low systematic from average beta.
Maximum orbit in TbT 0.35mm, in ORM 0.5mm.
Tool for automatic plotting. -> JIRA
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Tobias, Octupole effect on coupling
Powering octupoles comes with larger BBQ C- (observed in 2012 and 2016), also more noisy.
Nothing observed in the f1001 measured from AC dipole (2012). Ewen looked at possibilities of feeddown
but was very unlikely, required a rotation plus an offset of octupoles.
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Ewen, IR1 b4 correction at beta*=40cm / Decoherence at injection (Q'' puzzle)
No effect of b4 on lifetime without collision. Beam1 might have a better lifetime without corrections.
Main conclusion: We can play with IR octupoles. They have an effect. Careful follow-up needed.
Difference of Q'' measured in 2016, 2015 (before MCS broke, negligible impact) in the horizontal.
MCS settings in 2016 are stronger, but no effect.
Changes in the model cause negligible change compared to the 800 units observed in Q''.
Effect of crossing angles was 10 units of Q''.
MOF requires k=0.5m^-4 (~1.5 Amps) to produce 800 Q'' units.
Hysteresis could to part, however only horizontal and very large.
Two measuremens with same corr settings in 2016 disagree, however orbit reference changed in between.
Family of MO ROD.A56.B1 is weaker this year (also in 2015)-> Matteo said is a hardware weakness.
-> Wrong plot in IPAC -> Andy re-do
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MDs
Tobias, DOROS, FESA class: no news. -> Jaime or Lukas
People needed for DOROS: Tobias, whoever implements translation + another....
IR NL
Ewen, Felix, Massimo (?), Ana, Rogelio, (Andy in reserve)
ATS
Felix, Lukas (5Hz modulation in dp/p with AC dipole),
Felix does the coding of the output files.
Correction target to be checked.
-> actions:
-New local knob,
-Check ATS triplet settings (Ewen, Lucas)
-coupling knob compatibility (Jaime)
-Tune knobs compatibility (maybe ok)
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