Search found 168 matches

by mfb
Sun Jun 18, 2017 1:03 am
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

Re: 2017 Operation

1550 bunches, and the LHC hit its design luminosity for the first time in 2017.

1.25/fb collected for ATLAS and CMS.
by mfb
Wed Jun 14, 2017 7:46 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

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 ...
by mfb
Sun Jun 11, 2017 2:43 am
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

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...
by mfb
Sat Jun 10, 2017 4:50 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

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.
by mfb
Mon Jun 05, 2017 8:01 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

Re: 2017 Operation

Weird, the second page has a much larger luminosity for ATLAS, with luminosity increases where we didn't have stable beams.
by mfb
Mon Jun 05, 2017 12:15 am
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

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.
by mfb
Sun May 28, 2017 2:37 am
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

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...
by mfb
Tue May 23, 2017 2:40 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

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.
stablebeams.png
stablebeams.png (96.49 KiB) Viewed 4754 times
by mfb
Sat May 20, 2017 4:56 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

Re: 2017 Operation

First bunch trains in the machine, 4 times 12 bunches per beam.
bunchtrains.png
bunchtrains.png (88.62 KiB) Viewed 4786 times
by mfb
Sat May 20, 2017 12:02 am
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

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.
by mfb
Thu May 18, 2017 10:42 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

Re: 2017 Operation

Fixed, beam is back.
by mfb
Wed May 17, 2017 10:16 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

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 ...
by mfb
Tue May 16, 2017 9:07 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 22325

Re: 2017 Operation

We had first 13 TeV collisions already, with individual nominal bunches, without stable beams.

We might get first bunch trains tomorrow.
by mfb
Thu May 04, 2017 7:22 pm
Forum: The Accelerator
Topic: Where's the link to LHC morning meeting documentation?
Replies: 29
Views: 8221

Re: Where's the link to LHC morning meeting documentation?

I'm working for one of the LHC experiments.
by mfb
Thu May 04, 2017 4:11 pm
Forum: The Accelerator
Topic: Where's the link to LHC morning meeting documentation?
Replies: 29
Views: 8221

Re: Where's the link to LHC morning meeting documentation?

I can see the meetings and the wiki.