LPC meeting summary 11-03-2024 - final
|
|
LPC meeting summary 11-03-2024 - final |
|
Main purpose of the meeting: 2024 Planning and Final Discussions on Shifting the YETS
Introduction (Federico Alessio)
(Chris Young) VdM plans - it was clarified that we hope to do all four experiments, and ATLAS/CMS will proceed first as they require the most expert presence.
(Matteo Solfaroli Camillocci) It was clarified that a single step was made to B*=93cm and a single step also to 30cm.
(Catrin Bernius) It was asked how many 3 and 12 bunch fills would be done. We will only do one 3 bunch fill, but we might have multiple 12 bunch fills.
(Rende Steerenberg) There is small gain in physics time in the new timetable as there is 1 fewer technical stop in 2025 and there has not been a request for an additional stop during 2024.
(Jorg Wenninger) The problem on the coupler in 6B1 is on the motor and since there is an access planned for next Wednesday this will be replaced then. This is not needed for the low intensity commissioning. The current schedule depends on the progress of the RF noise excitation studies. We still hope to do splashes in ATLAS/CMS on Wednesday morning.
(Andrea Ferrero) ALICE have some interest in horizontal tracks in the ID. This will be discussed with Jorg offline.
(Gianni Masetti) It was asked what filling schemes will be used for the collisions at injection. We need to look back at last year for the details but it was 3 bunches and 12 bunches. We will use exactly the same schemes as last year for simplicity. We might rename it as it has _2018 in the name. It is hoped that this will happen next week, likely near the middle of the week.
CMS (Andrea Massironi)
(Michi Hostettler) This shift was sorted by RF between the splashes and circulating beam, such that the observations by CMS make sense.
(Jorg Wenninger) The Roman plot alignment run is too far in the future to be completely confirmed at the current time.
(Federico Alessio) For the Roman pots at 900 GeV are there any particlular things we need to be concerned about, but they are still far out so this is not a concern.
ATLAS (Catrin Bernius)
(Roderik Bruce) For the horizontal muons are you aiming for the same background rate. We were happy with all the settings from last year apart from the crossing angle which has been accomodated.
(Roderik Bruce) Are any of the other experiments interested in loss maps. LHCb are. There will be a LHC beam background meeting on the 18th March.
(Federico Alessio) If the intensity is higher would you want to level. Yes, this would be desired. The beta* leveling would proceed as usual and offset leveling would be used to maintain a maximum pile-up of 40.
(Jorg Wenninger) It is very unlikely that the LHC would be ready before Easter and would not start over the holiday such that it is unlikely that you will need to have the magnets ready early.
(Jorg Wenninger) The timing is fixed now so ATLAS can adjust their timing of BCID 1.
(Roderik Bruce) The preliminary statement from the FLUKA team is that the 20.6/44.8 sigma settings should be OK as this is the same physical aperature as last year. At the next collimation meeting this week this will be discussed and confirmed.
LHCb (Elena Dall'Occo)
(Jorg Wenninger) It should be fine to inject gas with SMOG2 this week. For the first time you want to use SMOG2 you should make sure the LHC operator knows.
ALICE (Andrea Ferrero)
(Jorg Wenninger) Next Wednesday we will definitely have an access of at least 4 hours for SND/FASER, and probably longer for the coupler. It is assumed to be 8am-12am.
(Matteo Solfaroli Camillocci) It would be extra cycles but if we are running smoothly it will be a limited number of cycles. By the summer we should have the spare, but the replacement time would take out a significant fraction of the extra time.