Minutes and Summary

Main purpose of the meeting: Progress with 2026 ramp-up; Updated plan for 2026; 3.5 day Cryo replacement; TS moved back earlier

LPC 16 March 2026

 

Present (P = in person): Martijn Mulders (P), Chiara Zampolli (P), Sune Jakobsen (P), Eric Torrence (P),  Jörg Stelzer (P), Archie Sharma (P), Julia Negro (P), Filip Moortgat (P), Krystian Roslon (P), Silvia Pisano (P), Flavio Pisani (P), Federica Oliva (P), Roderik Bruce (P), Mirko Pojer (P), Sofia Kostoglou (P), Joanna Wanczyk (P), Michi Hostettler (P), Georges Trad (P), Juan Esteban (P), David Stickland (P), Riccardo Longo, Stephane Willocq, Ivan Amos Cali, Brian Petersen, Maciej Trzebinski, Tomasz Bold, Christophe Lannoy, Dragoslav Lazic, Belen Salvachua, Daniele Mirarchi

 

LPC intro (Chiara Zampolli)

Sune Jakobsen: will it be possible to have other accesses during the 1.5 “cryo” days before the Technical Stop? 
Chiara Zampolli: other accesses may be possible, but not the installation of the ZDCs. 

Roderik Bruce: why is that? 
Chiara Zompolli: because we need radiation cool-down for the ZDC installation. 

LHCb (Flavio Pisani)

Michi Hostettler [about the proposed schedules for the LHCb magnet flips]: yes, this is ok. We have quite a bit of experience from last year and a procedure that works well. Just please avoid doing it the last night before a holiday or weekend when a lot of people are away. 

Chiara Zampolli: of the two proposals the second one looks easier.
Flavio Pisani: yes it has less magnet cycles, and is also our favorite one.
Chiara Zampolli: ok good. Then we take that one. 

Michi Hostettler: can we rely on your vertex z-position feedback? Then I will enable it in our feedback loop. Flavio Pisani: yes. 

ALICE (Silvia Pisano)

Chiara Zampolli: how did the test at high-rate go? 
Silvia Pisani: most likely we will stay at 23 kHz. We may schedule more tests later in the year. 

Michi Hostettler: same question about the z-position. 
Silvia Pisani: we will give you an answer soon.

ATLAS (Eric Torrence)

Michi Hostettler: if your online z-position is good we will use it. 
Eric Torrence: yes, please go ahead and turn it on.

CMS (Julia Negro)

Michi Hostettler: is your online z-position ready to be used?
Julia Negro: we will double-check and get back to you. 

Michi Hostettler: if there is a common shift between the 4 experiments we can fine-tune and correct for that. If you can all show these results we can compare. 

Chiara Zampolli: ok let’s prepare a slide for next week with the z positions of all 4 experiments.

Eric Torrence: for the one fill that will use the filling scheme with INDIVs, can we get at least a few hours notice before this happens? 
Chiara Zampolli: yes sure. We can say when the next fill will be with INDIVs, but then we of course don’t know exactly when that will be.  

AOB

David Stickland: for the high-intensity test in June; do you need anything from the experiments, such as BPTX for example, or not? 

Sofia Kostoglou: in the current schedule we don’t even know if we will have a fill where we will be colliding. 

David Stickland: no no I am assuming there will be no collisions, but it just depends on whether we keep certain racks on or not. 

Michi Hostettler: for sure we have to be sure that you don’t generate any interlocks, and if there is a fill with collisions at the end which at the moment we don’t know, luminosity would be great. Otherwise well, the Brans are also sensitive to the amount of lumi, but otherwise no. BPTX is more feedback to make things good for you, to center the beams in the experiments.  

Flavio Pisani: you want to check the temperature also with the VELO closed at some point? Because for this we need collisions, to close. 
Sofia Kostoglou: [...] no, we will have low lumi in LHCb from the first week, it will just be ATLAS and CMS.