2018 Operation
Re: 2018 Operation
I raise my beer to the unsung Operator heroes!
Re: 2018 Operation
16L2 wreaking havoc once more. Maybe clean it out for good?
Re: 2018 Operation
Performance is certainly trending sky high:
https://twiki.cern.ch/twiki/bin/view/CM ... year_plots
https://twiki.cern.ch/twiki/bin/view/CM ... year_plots
Re: 2018 Operation
Here you can see that they are at about twice the predicted performance... not bad. (That was at the time I posted this, which was May. The updated graph will of course change, and I can't predict what it looks like when you read this.)
https://twiki.cern.ch/twiki/pub/LhcMach ... -model.png
This picture is from the coordination page (scroll down to find it):
https://twiki.cern.ch/twiki/bin/view/Lh ... nationMain
https://twiki.cern.ch/twiki/pub/LhcMach ... -model.png
This picture is from the coordination page (scroll down to find it):
https://twiki.cern.ch/twiki/bin/view/Lh ... nationMain
- Tau
Re: 2018 Operation
There have since been a raft of subsequent faults, all different in nature. The latest is a pair of cryo failures.
Re: 2018 Operation
134th LHCC Meeting - Agenda OPEN Session
https://indico.cern.ch/event/726320/
Aiming for ~60\fb for 2018
JMc
https://indico.cern.ch/event/726320/
Aiming for ~60\fb for 2018
JMc
Re: 2018 Operation
The gruffalo with his hand on the beam dump switch
Re: 2018 Operation
Aha, so that causes unexpected dumps!
Looks a lot more plausible than birds dropping sandwiches in ventilation ducts https://cds.cern.ch/journal/CERNBulleti ... es/1221806 or a hump https://vixra.wordpress.com/2010/07/16/ ... erference/.
Looks a lot more plausible than birds dropping sandwiches in ventilation ducts https://cds.cern.ch/journal/CERNBulleti ... es/1221806 or a hump https://vixra.wordpress.com/2010/07/16/ ... erference/.
- Tau
Re: 2018 Operation
Hi
Can anyone explain why Atlas isn’t getting the same lumi as CMS and shed some light into what happened with the magnet?
Thanks
Joao
Can anyone explain why Atlas isn’t getting the same lumi as CMS and shed some light into what happened with the magnet?
Thanks
Joao
Re: 2018 Operation
ATLAS requested the lower lumi. I'm guessing there's little point stressing the computing resources collecting high-pileup data with the magnet off. I'll try to find out what the problem with the magnet is, although I'm sure mfb will tell us soon enough.
Re: 2018 Operation
From what I've heard, it was shut down on purpose to do a special run for the liquid argon calorimeter. I'm not sure I believe that.
Last edited by dukwon on Fri Jun 08, 2018 8:02 am, edited 1 time in total.
Re: 2018 Operation
8 quenches in S34. 12–15 hours to wait for cryo recovery
Re: 2018 Operation
This performance has not been repeated since - yet. Fingers crossed.andrewp wrote: ↑Sat May 12, 2018 10:09 pmLooks like the current run (#6675) will smash all previous LHC records for sustainable integrated lumi per 24 hour period - at least 1/fb.
Notionally this consists of 2 switchovers (time of dump to time of next stable beams) and 2 runs. The switchovers can be 2 hours each and the runs can be 10 hours each. Each run can deliver 0.5/fb.
Re: 2018 Operation
New switchover record! Run #6773->6774 took 1h23m !! (dump->SB).
Good lumi too, so we shall see...
Good lumi too, so we shall see...
Re: 2018 Operation
21:39 to 23:55 is 2 hours, 16 minutes. I believe the theoretical minimum turnaround time is about 1h45m.