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News, Rogelio:
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Warm welcome to the first meeting of the new LNO section.
Including students and visitors, the section has about 25 members, or a bit smaller than its predecessor, the HSS section.
Rogelio encourages all of us to contribute directly, also in a rather casual way by exchanging and sharing information and report about ongoing activities.
Meetings are planned bi-weekly, Wednesday morning starting at 9:00 to minimize overlap with the alignment meeting.
The section deals with optics & commissioning and related computing work, and some experimental interface aspects via Helmut.
It is closely related to other sections and in particular with NDC (Non-linear Dynamics and Collimation) and we will probably also have some joint meetings.
Helmut agreed to take short notes of this meeting, to be posted shortly after the meeting on indico. Feel free to add and correct.
News (general news are reported in the ABP information meetings):
The summer student requests were accepted. Summer students this year will attend remotely.
IPAC abstracts were discussed and submitted and writing of the contributions should start soon to be ready for the deadlines set on the department level, likely end of March / beginning of April.
The group has a computing panel. It is followed for our section by Riccardo, Laurent and Tobias as regular participants.
Concerning the machines: there is excellent progress on injectors, currently restarting with beam.
There are mixed news from the LHC side: significant empty cryostat offsets were reported. This and the possible consequences will also be discussed in today's LMC meeting.
Round table, all :
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Helmut: extending the MAD-X module MAKETHIN. 2nd order bend parameters are now transmitted to DIPEDGE in slicing, and permanent misalignment parameters copied to the sliced sequence. He continues to work on extended slicing of the FCC-ee IP region with solenoid-fringe / quadrupole overlap and observes inconsistencies in the current MAD-X second order (tensor) terms that can predict too high dispersion (2x).
Marian and Helmut were asked to present in the FCC-ee-MDI meeting planned next Monday.
Tobias: good progress in the implementation of misalignment parameters in MAD-X and continued online model preparations for RUN3. Preparing the next MAD-X release, planned for mid February.
Alexander: injectors are now commissioning with beams, so far rather ahead of schedules. LINAC IV and H- injection work well. The booster accelerated beams successfully in all four rings. Details of PS commissioning are discussed. First beams are planned in the PS beginning of March. He is also busy working closely with the newly restructured alignment group.
Wietse just defended his master thesis and presented in the PS meeting, and could also present in this meeting.
Laurent: recent MAD-X activities were already mentioned by Helmut and Tobias. He is working on details and fixes related to MAD-X/PTC. MAD-NG has been reviewed and the status summarized. Some discrepancies with other codes like SAD were reduced by improving the numerical precision, including using more digits in geometry files. He reminds that the baseline for all lattice descriptions (including FCC-ee) should be in MAD-X compatible input format.
Riccardo: preparing target optics, scenarios and parameters sets for HL-LHC RUN4. Generating the LHC baseline optics for RUN3 (without 11T). Revising the alignment document specifications. Concerning codes and in particular SixTrack, he reports that Frank Schmidt continues to work on the puzzle of chromaticity seen with combined function magnets in the PS. Revising the SixTrackLib for running with CPU and GPU with GigaBytes of memory.
Dominik Wolf : working on orbit bumps. Studying the effect of moving away from 90 degree phase advance per LHC arc cell.
Barbara Dalena : working with Thomas on 3D magnetic analysis, with a planned IPAC contribution. She is familiar with the SixTrack symplectic integrator and was encouraged to see if this can be applied to solenoids.
Eirik Hoydalsvi: working on accuracy of the C- measurement and on tests for correction schemes
Felix Soubelet : working on optics corrections for the LHC including local coupling corrections improved using waist shifts. A more accurate waist shift knob might be explored.
Hector Garcia Morales : working on local corrections for HL-LHC including machine learning techniques.
Joschua Dilly: working on an extension of the IR nonlinear correction script including feeddown from orbit or misalignments, currently in testing mode.
Leon Van Riesen-Haupt : MAD-X and SAD studies, with comparison for FCC-ee, including solenoid, beta-beating and coupling.
Lukas Malina : mostly writing up his work and preparing several IPAC contributions related to optics measurements with 3d excitation and corrections, including chromatic beta-beat, SVD-calculations and user interface aspects.
The next meeting is planned to be largely devoted to injectors, the following maybe on solenoid.