2017 Operation

The place to discuss the LHC. Commissioning, operation, issues, events ....
jmc2000
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Joined: Sun May 08, 2011 2:51 pm

2017 Operation

Post by jmc2000 » Thu Dec 01, 2016 10:46 pm

From the recent 128th LHCC Meeting:https://indico.cern.ch/event/580364/, page 27 from LHC Machine Status Report:
Naively applying 2016’s overall Hübner factor gives between 45 and 60 fb-1
Final configuration following discussion at Evian and Chamonix
jmc2000

tomey36
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Joined: Wed Apr 14, 2010 11:39 pm

Re: 2017 Operation

Post by tomey36 » Mon Dec 05, 2016 7:11 pm

that's a wrap. They ended the year with 58% time in stable beams, which is pretty amazing. They met or passed all the lumi goals as well. Here's to a 2017 run that is just as productive.

jmc2000
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Re: 2017 Operation

Post by jmc2000 » Thu Mar 09, 2017 11:05 pm

Summary Session of the LHC Performance Workshop 2017, March 1st:
https://indico.cern.ch/event/614870/

Aim is to record 45\fb, but going by previous years they'll probably go far further: 60\fb? ;)

jmc2000

mfb
Posts: 168
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Re: 2017 Operation

Post by mfb » Sat Mar 11, 2017 6:30 pm

Here is the schedule
Machine checkout starting April 26, commissioning with beam starting May 1. Scrubbing in early June if necessary, with first stable beams currently expected for June 12. Only 3 MD and TS blocks until the end of the year.

mfb
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Re: 2017 Operation

Post by mfb » Fri Apr 28, 2017 10:15 am

Beam should be back on Saturday or Sunday.

dukwon
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Re: 2017 Operation

Post by dukwon » Sat Apr 29, 2017 4:46 pm

getAttachment.php.png
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First full turn of 2017 :clap:

dukwon
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Re: 2017 Operation

Post by dukwon » Sat Apr 29, 2017 6:22 pm

lhc1.png
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Both beams circulating

mfb
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Re: 2017 Operation

Post by mfb » Mon May 01, 2017 11:26 am

Ramp to 6.5 TeV last evening. Squeeze to 1 meter went smoothly.

The ULO (unidentified lying object) has moved a bit to the side, which means more space for the beam.

Next: squeeze to 40 cm.

neocortex
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Joined: Tue May 02, 2017 10:09 am

Re: 2017 Operation

Post by neocortex » Tue May 02, 2017 10:30 am

Looks like they got all the optics corrections done down to 40cm.

From memory of the MD they did last year, the ATS (Achromatic Telescopic Squeeze) optics they're using now is much easier
to correct than the nominal optics. I don't have access to the morning meetings anymore so I can't see what beta-beating they achieved.

neocortex
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Re: 2017 Operation

Post by neocortex » Thu May 04, 2017 2:06 pm

Commissioning is going well. Beam loss monitor latency checks, for machine protection and loss maps, have been done.
Setup of the Abort Gap Keeper (AGK) for the injection kickers at point 8. Injection kicker interlock tests done including checking the Abort Gap Keeper and Beam Energy Tracking System (BETS).
Injection kicker response in both transfer lines (TI2, TI8) measured.
Setup of the Transverse Damper (ADT) with probe bunches.
Finally commissioned the Ballistic optics after a second attempt. This type of optics is used to measure the optical effects of the triplet quadrupole magnets, on either side of ATLAS and CMS, by leaving them switched off and performing the usual measurement and correction.
As of this post OPs are setting up beam instrumentation and the RF cavities for operation with nominal bunches (1E11 protons).

mfb
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Re: 2017 Operation

Post by mfb » Tue May 16, 2017 9:07 pm

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

We might get first bunch trains tomorrow.

dukwon
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Re: 2017 Operation

Post by dukwon » Tue May 16, 2017 10:14 pm

LHCb is starting night shifts on Saturday in anticipation of possible stable beams this weekend. I gather the other experiments have been doing night shifts for weeks already out of some sort of sense of masochism.

dukwon
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Re: 2017 Operation

Post by dukwon » Wed May 17, 2017 9:24 am

12b trains pushed back to maybe tomorrow. Tentative plan is 3x3 stable beams on Saturday night and a few nights next week. Intensity ramp might start the week after.
Has anyone heard if scrubbing will go ahead?

mfb
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Re: 2017 Operation

Post by mfb » Wed May 17, 2017 10:16 pm

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 they skip it.

dukwon
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Re: 2017 Operation

Post by dukwon » Thu May 18, 2017 9:36 am

R.jpg
Leak in US45
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Water leak in US45 (the old ALEPH service cavern).

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