1550 bunches, and the LHC hit its design luminosity for the first time in 2017.
1.25/fb collected for ATLAS and CMS.
Search found 168 matches
- Sun Jun 18, 2017 1:03 am
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
- Wed Jun 14, 2017 7:46 pm
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
We had stable beams with 980 bunches, 2/3 the design luminosity, nearly 0.15/fb in about 8 hours. Pileup is higher than in 2016 already, something like 50 inelastic collisions per bunch crossing. At ~2000 bunches we surpass the 2016 record if the pileup conditions stay the same, at 2800 we get more ...
- Sun Jun 11, 2017 2:43 am
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
I didn't see problems beyond the usual stuff that gets solved over time. Scrubbing takes some time, but the heat load is getting better. Good enough for 900 and hopefully 1200 bunches. With 20 hours in stable beams each we get ~0.5/fb. Edit: They'll go back to collisions Monday 9 am. A very short ru...
- Sat Jun 10, 2017 4:50 pm
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
Running smoothly. 12 bunches more than the design value. 3.3E14 protons in a beam is a new record.
The plan is to go back to collisions on Monday.
The plan is to go back to collisions on Monday.
- Mon Jun 05, 2017 8:01 pm
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
Weird, the second page has a much larger luminosity for ATLAS, with luminosity increases where we didn't have stable beams.
- Mon Jun 05, 2017 12:15 am
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
Stable beam with 600 bunches, 30% design luminosity.
0.13/fb delivered.
We'll see if the machine needs more scrubbing before going to 900 bunches. Last year it worked without.
The 2017 lumiplots are now there. Something is wrong with LHCb data.
0.13/fb delivered.
We'll see if the machine needs more scrubbing before going to 900 bunches. Last year it worked without.
The 2017 lumiplots are now there. Something is wrong with LHCb data.
- Sun May 28, 2017 2:37 am
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
Stable beams with 75 bunches, 3% the design luminosity. We'll probably get more stable beams tomorrow, and scrubbing with just 72 bunches on Monday. The beam pipe must be really dirty if this is necessary. Edit: Stable beams with 300 bunches, 15% design luminosity, in the night to Monday. Plan for t...
- Tue May 23, 2017 2:40 pm
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
First stable beams of 2017.
The number of collisions per bunch is already close to the 2016 records. Scaled up to 2800 bunches we could get 170% the design luminosity.
The number of collisions per bunch is already close to the 2016 records. Scaled up to 2800 bunches we could get 170% the design luminosity.
- Sat May 20, 2017 4:56 pm
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
First bunch trains in the machine, 4 times 12 bunches per beam.
- Sat May 20, 2017 12:02 am
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
A bit behind schedule due to the water leak - still no bunch trains, but other tests got done. Stable beams potentially Sunday afternoon/night.
- Thu May 18, 2017 10:42 pm
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
Fixed, beam is back.
- Wed May 17, 2017 10:16 pm
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
Not so much LHC activity during the night, easier to make various test runs there, and the big experiments have enough PhD students to run 24/7 during commissioning. I didn't hear anything about scrubbing, but I would expect that it works similar to 2016. It is scheduled, but if it is not necessary ...
- Tue May 16, 2017 9:07 pm
- Forum: The Accelerator
- Topic: 2017 Operation
- Replies: 72
- Views: 168719
Re: 2017 Operation
We had first 13 TeV collisions already, with individual nominal bunches, without stable beams.
We might get first bunch trains tomorrow.
We might get first bunch trains tomorrow.
- Thu May 04, 2017 7:22 pm
- Forum: The Accelerator
- Topic: Where's the link to LHC morning meeting documentation?
- Replies: 29
- Views: 58714
Re: Where's the link to LHC morning meeting documentation?
I'm working for one of the LHC experiments.
- Thu May 04, 2017 4:11 pm
- Forum: The Accelerator
- Topic: Where's the link to LHC morning meeting documentation?
- Replies: 29
- Views: 58714
Re: Where's the link to LHC morning meeting documentation?
I can see the meetings and the wiki.