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LNO section meeting
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Europe/Zurich
6/2-004 (CERN)
News
Newcommers: Conrad Caliari (QUEST), Halil Deveci (QUEST), Abid Hussain (visitor)
We have the pleasure to announce that the Physics Briefing Book, which provides important input for the 2026 update of the European Strategy for Particle Physics, has been released by the Physics Preparatory Group* and is available via this link:
https://cds.cern.ch/record/2944678
China delays CEPC timeline:
https://cerncourier.com/a/cepc-matures-but-approval-is-on-hold/
WP2a summary report assessing the different collider projects:
https://cds.cern.ch/record/2947131
LHC: 121 fb-1 integrated!!!
Currently running nicely with different beam intensities after 6L2 limited B1 bunch intensity. Next intensity limit seems to be TCLDs, that limited MD choices in last MD.
LHC schedule: Request to test protons after the ion run and before the YETS to probe intensity limits, specially in the TLCDs.
Delays of LS3 are not being considered by the CERN management at the moment but further discussions expected as ATLAS announced delays for its upgrade.
Ewen comments on the heavy ion optics commissioning yesterday:
The beam2 optics looked good, b1 still some beating. Compared to last year the dispersion beating correction improved by giving it more weight in the minimization. A significant waist shift of up to 20 cm was observed an in IP2. The origin is currently not well understood. Comparison with flat machine measurements indicate a connection with the crossing bump.
Ghislain reports that a major current ongoing activity is the comparison of FCC-ee GHC and LHC optics, to be finalized before the end of this year.
Helmut reports that his article on "Non-local Solenoid Compensation Scheme at the Future e+e- Circular Collider" co-authored with Manuela Boscolo and Andrea Ciarma was accepted for publication in NIMA, and meanwhile online with DOI 10.1016/j.nima.2025.171135.
LNO slides for the BE annual meeting
Rogelio shows 15 slide proposals he received so far. A complete list should ready by Friday or latest Monday for a pre-selection in the group. The progress in optics measurements and corrections of the flat LHC-optic and the correction of long range beam-beam using IR magnets is high-lighted, as well as OMC studies in the PS, SPS and LEIR. Other slides show the progress related to HL-LHC : first LIU beams with 2.3e11 ppb and updated parameter lists. Furthermore the progress in FCC-ee optics tuning, EPOL, the GHC/LCC comparison and the status of strategy documents, and contributions to the CLIC and HALHF linear collider studies is illustrated.
OMC MDs, Ewen
Ewen shows the planned schedule for MD5 next week with a fairly dense contribution related to optics measurement and correction starting on Tuesday night.
The current OMC team will be very busy and participation by people not yet in the team is encored. There will be efforts to improve precision using the damper.
Measurements on optics with increased beta in IR7 are planned for Thursday. A new method to identify sudden optics changes caused by energy changes possibly originating in a shift of the average horizontal orbit by correctors will also be tried. Stephane comments on the complexity of knobs by non-linearities and coupling between knobs.
LNO IPAC’26 contributions
https://docs.google.com/spreadsheets/d/1Dnkv4hd0NpCPyxWZV3YCFTbWfVTi5F0R4ul0PeOna64/edit?usp=sharing
Rogelio shows the 28 titles and names of the main authors as well as the participating authors that he received so far.
He reminds about the need to have a presenter for each presentation at the conference, the limits on the number of presentations by a participant and that participation of a person at two IPAC meetings in a row will not be approved. Ewen participated last year and effort needed to find presenters for OMC related contributions. Several of the presenters can be students supported by conference grants or institutes. The names of the presenters are discussed and updated to optimize the chances for approval. From the CERN staff side, Rogelio and Jacqueline are expected to participate at the conference.
Stephane comments that he will sent another title today. A full list is required by tomorrow for the BE approval.
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