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    After CAS meeting

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

    6/R-018

    CERN

    20
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    Tobias, Towards permill coupling control

    Two AC dipole kicks with same parameters give a rather different coupling measurement in B1, with a jump in IP5.

    Changing BPM used for the AC dipole compensation changes everything. Using secondary line from one file to another reduces the discrepancy among files.  

    Possible solutions:

    -Use several BPMs for the compensation, would also provide error bar.

    -In AC coupling still the 90deg optimum BPM pair is not used, just the

    -The ADT  implementation still uses AC dipole location and it is ok. Could it mean that only the tunes matter for the AC dipole compensation? -> Needs effort

    Another possible source is the broken AC dipole in B1?

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    Ewen, commissioning and MDs

    Measurement at 30cm  

    a3 and a4 correction in IR5 missing. Data for a4 correction to see how a3 was affected acquired.

    GUI for NL IR corrections should be pursued.

    DA MD:  Done in physics to remove the bumps, this is very important for backtracking settings.

    Good DA should be easy to compute from the blow-up ADT MD. 

    For the AC dipole losses were maximum 2.5%, to be analysed.

    DA at 6.5 TeV is very good. 

    First AC dipole kick dump the beam in the beam where we blow-up.

    Do we actually care about b6 in LHC? Maybe  for optics, amp det.

    Change single in .madx coupling corrs. Lukas can update correct.py to ouput a new file with old convention.

    AC dip aperture MD: very successful we saw all bottlenecks even unplanned.

    Issue with AC dipole having 0% kick but actually was large kick -> Contact N. Magnin (Felix).  

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    Yohany, action-phase jump analysis

     

     

     

     

     

     

     

     

     

     

     

     

     

     

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