What are the current records for LHC fills?

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jmc2000
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What are the current records for LHC fills?

Post by jmc2000 » Fri Oct 02, 2015 9:38 pm

Is there a page that records current records for LHC fills?

In particular, I'm looking for records of: 1. max instantaneous luminosity, 2. Max integrated luminosity over (a)one fill (b)one day, (c) one week 3. Max time for one fill

Cheers,

jmc2000

RocketManKSC
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Re: What are the current records for LHC fills?

Post by RocketManKSC » Sat Oct 03, 2015 1:59 am

try this https://cern.ch/LHC-Statistics or from portal LHC-> Coordination -> LHC Statistics ( near top center of the page)

jmc2000
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Re: What are the current records for LHC fills?

Post by jmc2000 » Wed Oct 07, 2015 5:44 pm

RocketManKSC wrote:try this https://cern.ch/LHC-Statistics or from portal LHC-> Coordination -> LHC Statistics ( near top center of the page)
Can I get the record for integrated luminosity in one fill from this?

Fill #4467 has been going for 22 hours with an integrated luminosity of 230pb for Atlas, which I suspect is a record.

Regards,

JMc

mfb
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Re: What are the current records for LHC fills?

Post by mfb » Thu Oct 08, 2015 8:09 pm

It is a record for 2015.
2012 had a higher luminosity, so the longest fills there got more. 240/pb, for example, and I don't think that was the best fill ever.

Edit: Nearly 290/pb in a 24-hour-run today (October 27th). Preaccelerator issues are good for lumi/fill records.
Now they try to go up by another 200 bunches. Could give a record luminosity for 13 TeV.

jmc2000
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Re: What are the current records for LHC fills?

Post by jmc2000 » Tue Oct 27, 2015 9:58 pm

@mfb it's a record, despite the instantaneous luminosity being only 4.5nb/s compared to over 7nb/s in 2012, but the longer beam life time makes up for this: >30 hours compared to 10 hours in 2012.

mfb
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Re: What are the current records for LHC fills?

Post by mfb » Sun Nov 01, 2015 3:35 pm

On the way to a new record. With an initial luminosity slightly above 50% of the design value for ATLAS and a bit lower for CMS (why?), we are at 271 and 262/pb respectively, while the luminosity is still 32% the design value after ~19 hours. Don't see plans to dump it yet, so in two hours we can have more than 290/pb and in ~2.5 hours about 300/pb for ATLAS.

Edit: Ouch. The beam got dumped literally one minute after I wrote this post. Unplanned, no description yet.
Edit2: RF cavity trip. They'll refill soon.

sciing
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Re: What are the current records for LHC fills?

Post by sciing » Fri May 20, 2016 8:17 pm

mfb wrote:Preaccelerator issues are good for lumi/fill records.
Here we go PS is down for 5 days. Lets hope they can hold the beam for some time.

mfb
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Re: What are the current records for LHC fills?

Post by mfb » Sat May 21, 2016 12:06 am

Nearly 200/pb so far in 21 hours. Would be interesting to see what happens after 30+ hours. Lumi dropped from ~35% to ~18% design value so far.

sciing
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Re: What are the current records for LHC fills?

Post by sciing » Sat May 21, 2016 4:52 am

The longest fill I found was fill 2006, just slightly below 26h. Just passed, so at least we have a new record for longest fill.

sciing
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Re: What are the current records for LHC fills?

Post by sciing » Sat May 21, 2016 8:24 am

Fresh from the morning meeting:
Longest fill in Stable Beams in the LHC history was Fill 1058 that lasted from 1:13am April 24th 2010 until 7:30am 25th April 2010 for a total of 30h17min

mfb
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Re: What are the current records for LHC fills?

Post by mfb » Sat May 21, 2016 11:16 am

Now we are at nearly 33 hours.
4:35 -> at least 13:21 (+1d).

ATLAS/CMS luminosity dropped to 1350 Hz/µb (from initially 3500), LHCb luminosity starts to drop as well (175 -> 163). 260/pb and 21/pb integrated luminosity respectively.

Long beyond the point where refilling would be better for luminosity, but as this is not possible...

Bunch length usually goes down over time, but after ~24 hours it started to increase a bit.

mfb
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Re: What are the current records for LHC fills?

Post by mfb » Thu Jun 02, 2016 10:15 pm

Some updated records:

- Longest time in stable beams: 35 hours 24 minutes, the run mentioned in the last post.
- Luminosity record: 7.9*10^33/(cm^2*s), or 79% design luminosity, by ATLAS yesterday evening and again this morning. CMS shows lower luminosity values, which is probably just a different calibration, so the luminosity could have been a bit lower (~5% uncertainty is not unrealistic). The run 1 record was 77% the design luminosity, so we are at the same level now. Assuming we beat the run 1 record, this is a record for hadron colliders in general.
- Integrated luminosity in 24 hours or within a day: ~350/pb Thursday, an all-time record certainly for the day (run 1 record was a bit below 300/pb for any given day) and probably for the 24 hours as well.
- Integrated luminosity in a single run: 350/pb (CMS value), an all-time record as well. (Edit: Updated with final number)

Integrated luminosity this year is now more than 2.1/fb for ATLAS and CMS, 125/pb for LHCb. More than 15% of that has been collected in the record fill.

Edit on Sunday: ATLAS got 375/pb integrated luminosity in ~18 hours, then the beams got dumped by machine protection. As comparison, that's about 3 months of Tevatron data, but at a higher energy. In this single run, more Higgs bosons were produced than at the Tevatron in 20 years.
2.8/fb in total.

mfb
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Re: What are the current records for LHC fills?

Post by mfb » Sun Jun 12, 2016 6:16 pm

The technical stop is over, and we directly got a record run! Started 0:20, dump is expected for 22:00 (in 2 hours), so the numbers will go up a bit more.

- Luminosity record: ~8.6*10^33, 86% design luminosity, displayed by ATLAS
- Integrated luminosity in 24 hours, in a single run, and within a day: At 430/pb for ATLAS so far (CMS: 410/pb), probably 450/pb for ATLAS by 22:00.

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Tau
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Re: What are the current records for LHC fills?

Post by Tau » Mon Jun 13, 2016 9:49 am

With only a bit of trouble between fills, there's another one going on.
If thing stay going this way, we are going to break the "maximum luminosity per week" record.
- Tau

mfb
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Re: What are the current records for LHC fills?

Post by mfb » Mon Jun 13, 2016 1:02 pm

Wednesday is reserved for beta*=2.5 km runs, no relevant luminosity from that day probably, but apart from that: sure.

Edit: >=24 hour run with 0.51/fb for ATLAS / 0.49/fb for CMS yesterday to today morning. Programmed dump after the luminosity was too low.

CERN discusses some of those records

2/fb in a single week is a record as well.

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