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    MADX wire implementation (and other news)

    → Europe/Zurich
    MADX wire implementation (and other news)
    Zoom Meeting ID
    67280924541
    Host
    Rogelio Tomas Garcia
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    18/08/2021 LNO meeting

    News:

    COVID: self testing can be done at CERN. Just requires a short (5 min) training. Rogelio recommends this, in particular for the younger people. Teleworking was approved for 1-2 days per week, just requiring the agreement by the supervisor with no need to mark as special measures. There are also possibilities to agree on more extended teleworking periods.

    PS magnetic model: considering to follow up with a common PhD with the magnetic group. Would need a good doctoral candidate and supervisors on both sides.

    There is good progress in LHC magnet training reaching nearly the current target values (6.8 TeV, 11.6 kA) in the 6 cold sectors. If training will be extended further will be decided in September.

    Helmut says he is testing solenoid slicing with localized fringe fields which maybe non-symplectic locally.

    MADX wire implementation and other news, Tobias, slides
    -------------------------------------------------------
    The (beam-beam compensation) wire element is implemented in MADX. In addition to the element length L, an integrated l_int and l_phy can be specified. The effect of the wire should be well simulated in tracking. The implementation in TWISS required the generation of first and second order transport maps. Tests are in progress.
    Tobias implemented a new optional npart attribute for the beam-beam element as requested by Riccardo. When this attribute is not specified, beam-beam will work as previously.
    An issue with cutting of nodes/element names in Cpymad has been fixed.
    An issue with misalignment and tilt apparent in PTC was identified by Piotr and Etienne to be caused by differences in reference frames.
    Etienne uses a newer version of PTC. Piotr already made a branch of MADX connected to the newer PTC.

    MADX uses an approximate drift expended around the untilted (px=py=pt=0) orbit. This is not very accurate for larger tilt angles. Tobias looks into the possibility to allow to expand around the exact (tilted) orbit derived from the exact drift.
    The target date for the next MADX release is September, well before the LHC beam test.
    Describing MADX improvements in a physics manual that is kept up to date was identified as important.
    Other possible improvements considered for MADX are:
    A generalized multipole including a longitudinal component.
    Extending the 6D capabilities present in the orbit determination to TWISS parameters like beta functions.
    Dealing with spin. Piotr says he can connect MADX to the PTC spin calculations to print extra information.

    Actions:

    -Piotr and Tobias to make new MADX-PTC available to test a bit more the new PTC version and hopefully include it in the next MADX release. 

    -Tobias, experience with the drift second derivatives about the reference orbit, in case it would slow down MADX to see how to proceed. 

    -Piotr to provide a very first interface to PTC spin in MADX in the next month.

    Next meeting: planned in two weeks, with as special subject the progress on MAD-NG and normal forms.

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