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BE-ABP LNO 2026 Welcome
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Europe/Zurich
6/2-004 (CERN)
BE-ABP LNO 2026 Welcome
2026 Welcome, Rogelio, slides
Welcome by Rogelio to the first LNO section meeting in 2026 under the new CERN management. He shows a list of the current LNO members end the foreseen arrivals. Welcome also to short term intern Dot Belin Pio working with Jacqueline on AC dipole related activities and collaborators from outside CERN including Ilya Agapov/DESY attending this meeting . LNO has a broad range of activities as also visible from the workplans presented during this meeting, covering all major current CERN machines, future circular and linear collider studies with also contributions to ATF and SuperKEKB at KEK. The first priority for CERN is the HiLumi LHC, followed by FCC.
Message from Department Head, Mallika Meddahi
A warm welcome also from our new Department Head Mallika : LNO has indeed an impressive workplan. At CERN we have 110 nationalities working together and also a role in contributing to demonstrate that we can well and efficiently work together in a world with changes beyond our control. Before leaving this meeting, she says that she will regularly spend time on Tuesdays and Thursdays in her office close to the BE 6/1-028 cafeteria where she could also be contacted.
Plans for LHC, Stephane Fartoukh
The LHC run this year will be relatively short with minor changes compared to last year. One goal is to further combine the ramp, squeeze and rotation to arrive with beams ready for collision optics at flat-top and to maybe try to squeeze further down to 15 cm in one plane. There is interest, in particular and also for the 2026 LHCb performance thanks to longer fills (ATLAS/CMS driven optimal fill length increased by 20%). The LHCb dedicated run at 1.2 TeV was discussed in this weeks LBOC meeting, but still deserves some discussions.
Plans for HL-LHC, Kyriacos, slides
Kyriacos shows the updated HL-LHC schedule and the HL-LHC Task 2.1 objectives to develop the nominal machine optics cycle and check the feasibility with download to LSA. Prepare flat optics alternatives and study optimization procedures with the development of linear and non-linear knobs, make these available in the repositories and follow by interfacing with other teams including alignment and collimation.
Plans for OMC, Ewen, slides
A priority this is year to be well prepared for a short effective re-commissioning of the LHC-pp run by re-using as much as possible earlier settings with re-validation in ideally just 3 shifts and at the same time to be well prepared for a more complete re-commissioning where needed. In case more significant changes compared to last year would be observed, it will be important to quickly understand the origin like optics or energy shift. The LHC VdM and ion runs also require recommissiong. In case of a low energy run as requested by LHCb it will be extremely challenging to squeeze the commissiong and run within a 48 hour timeline. The OMC team will also be very active in MD activities and preparations for HL-LHC commissioning, improved PS control/monitoring and SPS and LEIR.
Plans for FCC-ee, Marc and Ghislain, slides
The choice of the optics type, GHC or LCC and its implications on layout, civil engineering and booster location with respect to the experients will require close follow up this year. Both e+ and e- sequences must be defined with finalization of the lattice and utility insertions (inection, betatron collimation, momentum collimation, RF-section). Work on the experimental solenoid modelling in Xsuite with a first implementation of the quasi-local scheme is ongoing as well as studies related to BPMs, orbit, linear and non-linear correctors, RF-kickers and polarization wigglers. Injection efficiencies and lifetimes in particular at ttbar energy will have to be reviewed and improved. The choice of the cell length will have to be reviewed. Frank Zimmermann comments on possible issues with electron cloud that may require an increase in bunch spacing to 50 ns and more bunch intensity.
Plans for EPOL and FCCee tuning, Jacqueline, slides
Jacqueline presents the work plans for both the EPOL ( Polarization ) and Optics Tuning working group. She shows the possible FCC-timeline for the pre-TDR phase proposed by Mark Thomson in his Chamonix presentation with important milestones in the third quarter of 2027. There are 3 main EPOL tasks : 1) how to get polarization - including studies of a possible polarized source and transport. 2) what is needed to measure polarization including kicker and polarimeter considerations. 3) Strategies for monochromatization. The optics tuning studies can also be subdivided into three main subgroups : 1) needs for instruments and correctors. 2) robust tuning strategies including beam-based alignment optics, optics measurements and IP and luminosity tuning. 3) Commissioning strategies including possible needs for special optics (ballistic, higher beta), realistic error estimates and injection scenarios.
Plans for Linear Collider, CLIC, Conrad Caliari, slides
Conrad says there has been a discussion in the linear collider workshop this year to rescope the CLIC related studies to cover more generally linear collider studies focusing on 550 GeV cms energy based on CLIC-type X-band or ILC-type superconducting technology, CLIC-like chromatic corrections with 2 interaction regions. The work plan includes maintaining, modernizing and further developing tools (MAD-X, PLACET, Guinea-Pig, MAD-NG) with integration in XSuite based workflows. Objectives for the ATF-2 accelerator test facility 2 at KEK include studies and improvements to demonstrate the small vertical beam size requirements for ILC including stabilization.
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