2022 Operation

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dukwon
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Re: 2022 Operation

Post by dukwon » Wed Aug 24, 2022 1:55 pm

Cooling plant at point 4 stopped last night, leading to failure in RF cryo. Three pressure release disks ruptured!

No beam for approximately 4 weeks

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Tau
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Re: 2022 Operation

Post by Tau » Wed Aug 24, 2022 5:33 pm

dukwon wrote:
Wed Aug 24, 2022 1:55 pm
Cooling plant at point 4 stopped last night, leading to failure in RF cryo. Three pressure release disks ruptured!

No beam for approximately 4 weeks
:shock:
At least it was the pressure release disk, and not something worse. We know what could know wrong :think:
- Tau

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trobbins
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Re: 2022 Operation

Post by trobbins » Thu Aug 25, 2022 12:42 am

OMG.

Does that mean the next period of MD is going to be pruned?

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Re: 2022 Operation

Post by dukwon » Mon Aug 29, 2022 1:55 pm

This week is being used for access ("part 1 of TS1" if you like), next week will be some OP tests (apparently access not possible) and what remains of TS1 goes ahead as planned the following week. Expect return to operations on/after the 16th September

jmc2000
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Re: 2022 Operation

Post by jmc2000 » Mon Aug 29, 2022 9:07 pm

Is there a link for this year's running schedule including MD and TS?

jmc

dukwon
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Re: 2022 Operation

Post by dukwon » Mon Aug 29, 2022 10:12 pm

The most recent schedule is always linked near the top of https://lpc.web.cern.ch/

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Re: 2022 Operation

Post by dukwon » Fri Sep 16, 2022 9:05 am

A few updates regarding the schedule.

The LHC should be ready for beam again on Tuesday 20th September

Due to the upcoming winter energy crisis, YETS is brought forward 2 weeks to Monday 28th November.

Whether or not we have a heavy-ion run this year is still TBD.

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Re: 2022 Operation

Post by dukwon » Mon Sep 19, 2022 9:21 am

As people may have seen (oddly from the news media rather than directly from CERN), the energy crisis this winter may impact the accelerator complex on short time-scales if EDF requests it: https://www.wsj.com/articles/europes-en ... 1662294416

More concretely, starting 15th October, EDF can ask CERN to reduce energy consumption with one day's warning. This means switching off the SPS and, if needed, the rest of the injector chain, as there is little that can be done with the LHC (at least on such short time-scales). Ideally a long fill would cover the injector downtime.

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trobbins
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Re: 2022 Operation

Post by trobbins » Tue Sep 20, 2022 1:48 am

That wsj article is firewalled. This link may just say the same, which indicates up to 25% consumption reduction from non-LHC facilities. I'd expect there are detailed contingency plans for what can be de-energised and for how long and to what schedule, or even a short term sacrifice of some programs/facilities as an interim measure given the changing situation in europe.
https://www.theregister.com/2022/09/07/ ... own_plans/

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Re: 2022 Operation

Post by dukwon » Tue Sep 20, 2022 7:05 am

trobbins wrote:
Tue Sep 20, 2022 1:48 am
I'd expect there are detailed contingency plans for what can be de-energised and for how long and to what schedule, or even a short term sacrifice of some programs/facilities as an interim measure given the changing situation in europe.
I haven't held back on details. The only info I can find are "YETS 2 weeks early" and "switch off SPS/injectors within a day if EDF asks". Detailed plans would probably just be abandoned in favour of whatever suits the actual situation at the time. Can't predict everything!

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Re: 2022 Operation

Post by dukwon » Fri Sep 23, 2022 9:26 am

Looking to next year, if the energy crisis continues, YETS 2023-24 may begin at the end of October. In the longer term, we may see a general "optimisation" (reduction) in the physics programme. Expect more news after the Council next week.

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trobbins
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Re: 2022 Operation

Post by trobbins » Sun Sep 25, 2022 1:50 pm

Record longest fill !

M.
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Re: 2022 Operation

Post by M. » Sat Oct 01, 2022 3:35 pm

Back to a full machine with 2461 bunches!
Electron cloud is still the main limiting factor, but there is some margin to push the bunch intensity a bit higher.

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Re: 2022 Operation

Post by dukwon » Tue Oct 04, 2022 3:44 pm

LHCb wanted to partially-insert the VELO (to 10 mm separation) today, but it was unable to fully recover from a power-cut at the data-centre.

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Tau
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Re: 2022 Operation

Post by Tau » Thu Oct 06, 2022 7:34 am

dukwon wrote:
Tue Oct 04, 2022 3:44 pm
LHCb wanted to partially-insert the VELO (to 10 mm separation) today, but it was unable to fully recover from a power-cut at the data-centre.
Does that mean VELO wasn't in until now?
- Tau

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