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    Before Evian

    → Europe/Zurich
    6/R-018 (CERN)

    6/R-018

    CERN

    20
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    Tobias, optics corrections For Evian (14:10)

    Ewen: label  b3 & b4 -> a3 b3 & b4  ... clarify b3 and b4 are new

    Highlight feeddown from IR sextupole errors.

    (k-mod with orbit feedback not mentioned)

    slide of the zoom of the beta-beat at IP not so clear...

    Ewen: Final beta-beating 2015 slide too fast

    2016 before 2017 on bar plot? Actual messages? better text in labels

    Not an issue ATS coup, but larger strength... mention?

    Ccoming -> Coming

    left and right, what?

    Automatic conversion?

    Do we change the local b3 correction? ->  Proposed MCS correction

    Conclusion of slide: Recommendation for the new proposed MCS compensation

    Felix: missing arc

    Ewen: more impressive plot with both a/b4 and a/b3

    Ewen: motivation to correct a4

    Piotr: Rigidity knob

    Ewen: Effect of Xing on a4 RDTs -> Higher orders?

    mentioning explicitly decapole and dodecapole

    a4-> skew octupole?

    No table -> sentence !

    Coming from higher order errros : decapole and dodecapoles

    ###########################

    Andreas, Lobster

    BPM noise really deteriorates the possibilities to measure Lobster.

    ####################################################

    Jacqueline, 2nd order dispersion

    All bumps are a disaster -> shutdown work!

    Other measurements?

    Some problems in second order Dy but also smaller.

    Exact settings to be checked.

    Larger D2 error in Beam 2 H. Step in IP4.

    Check measured orbits + model orbits

    Check models.

    Check normalized D2.

    Put the IP labels

    Check Tracking simulations.

    ###################################################

    Michael, kmod 3 status

    new formula following Javier Cardona's observations.

    References use old convention, towards focusing quadrupole.

    BPM file format stays the same. 

    Voted for new format of beta* output: Changes in GUI and kmod.

    -New convention for waist shift convention to be thought about

    Ideas to cope with coupling, remove points, add error bars, shift tunes...

    ##########################################

    Joschua, MD3311, June

    Check if WISE only adds errors.

    Ewen saw a bigger spread, tbc.

    Large contributions to b4 from all a5, b5 and b6, a6.

    ###########################################

    Ana, action error bar analysis

    Spread of action using beta from model. 

    Using beta from phase ... if we compensate is good enough until 7%.

    Maybe we could use real statistical errors.

    ###########################################

    Lukas, Chromaticity and chromatic beta-beating

     

     

     

    ##################

    Felix

     

     

     

     

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