248th HiLumi WP2 Meeting

Tuesday 25 Aug 2026, 10:00 → 12:30 Europe/Zurich

Chair: Rogelio Tomas

Minutes: Xavier Buffat

10:00 → 10:10 General information & Introduction of the meeting

3 meetings to prepare annual meeting:
+Today: Sorting, DA and optics
+Sept 2nd afternoon?: WP2/4/5
+Sept 8th: WP2/Detectors

New meeting series LMC + HL-TCC -> HLMC on Friday morning

News:
+SPS' instabilities at 2.3e11 ppb fully fixed with fine control of longitudinal emittance blow-up.
+BGI in SPS acquired some first good data
+Data from IT string being acquired: Flux jump, voltage spikes and PC response to a fault. To be analyzed. No major concern (a large voltage spike had negligible current change -> Need better modeling).
+LPC yesterday (Sofia presented, Nicolas et al attended): ID800 chamber issue raised- ongoing discussions to decide radius. Need of non-colliding bunches to be clarified, they would need like 6 months. Experiments want to know crossing angle reduction. LHCb requested that filling schemes do not change often.

Medium term goal: Have a first draft in 6 months of new baseline and alternatives

Speaker: Rogelio Tomas Garcia (CERN)

10:15 → 10:35 Sorting strategies based on transfer function and field quality of the new superconducting magnets in the HL-LHC

Speaker: Andrea Fornara (CERN)

HLCM26_sorting.pdf

HLCM26_sorting.pptx

10:40 → 11:00 Status of Dynamic Aperture with updated magnet errors

Speaker: Andrea Fornara (CERN)

HLCM26_DA.pdf

HLCM26_DA.pptx

11:05 → 11:25 Update on optics release and impact of bellows limiting the FRAS tilt

Speaker: Kyriacos Skoufaris (CERN)

Update on optics release and impact of bellows limiting the FRAS tilt.pdf

11:30 → 11:35 AoB