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6/R-018 (CERN)

6/R-018

CERN

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Present: Lukas, Andreas, David, Jaime, Lukas, Felix, Tobias, Ana, Ewen

 

 

Jaime, beta-beating in Hi-Lumi

Adding K-modulation to the segment-by-segment improves considerably from only phase. Preliminary an improvement is observed correction backwards and forwards simultaneously. Tobias: simultaneous corrs for various beta*.

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Felix, K-mod and coupling

C- is very important for K-modulation measurements. How big is C-?

Use rms noise from SVD clean to estimate largest coupling amplitude (Lukas has new SVD clean / BPM)?  Or use Drive output? -> estimate of errors in case

We should minimize C-! Systematic Errors in coupling.

A tilt of Q1 also affects betas at the 0.3% level (single Q1).

 

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Ana, beta from amplitude, balistic and 2.5km

Still a 100m error bar in N-BPM method. 

Bad phase measurements are clearly related to bad signals. -> need report

Maybe the beta from amp improves by few % the accuracy (from 6 to 4 or so).

Results are without cleaning BPMs -> Redo after cleaning!

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Andreas, NBPM

Check with Jaime how to decide what a BPM is.

Check the actual T matrix with Andy's.

---> Few bad BPM combinations --> New formula

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Benoit, MCS

Excellent data. The arc without MCS powered clearly seen, the tunes cross.

Non-linearities in horizontal tune more pronounced.

Ewen: Change in Q''x of 800.

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Tobias, paper

contents of the paper: 

*Improvements after LS1

*Why not better in 2015?

*Operational aspect of the corrections

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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