Search found 100 matches
- Sat Jun 18, 2011 9:47 am
- Forum: The Accelerator
- Topic: 2011 Events Discussion
- Replies: 184
- Views: 259993
Re: 2011 Events Discussion
Looks like they're going for the next step - 1236b - this afternoon, at last!
- Thu Jun 09, 2011 5:05 pm
- Forum: The Accelerator
- Topic: Luminosity drop
- Replies: 2
- Views: 6064
Re: Luminosity drop
Oh right, thanks, I forgot that L ~ I²...
Was there a particular reason to push the intensity down by 10%? Too many UFOs I guess?
Was there a particular reason to push the intensity down by 10%? Too many UFOs I guess?
- Thu Jun 09, 2011 4:18 pm
- Forum: The Accelerator
- Topic: Luminosity drop
- Replies: 2
- Views: 6064
Luminosity drop
Hi, I think this speaks for itselft: http://cms-service-lumi.web.cern.ch/cms-service-lumi/publicplots/lumipeak-2011.png Peak lumi's been dropping steadily and is now around the peak lumi they got with 912 bunches, though they have more than 100 more in the machine... The beam currents are a little b...
- Sun Jun 05, 2011 12:17 pm
- Forum: Science
- Topic: Proton mass increase
- Replies: 7
- Views: 17829
Re: Proton mass increase
It it not quite correct to say the proton mass has increased... Special relativity modifies Newton's law F=ma, and in this particular case it is as if the proton mass had increased by the relativistic factor gamma. But the proton itself has not become "bigger"...
- Fri May 27, 2011 9:11 pm
- Forum: The Accelerator
- Topic: 2011 Events Discussion
- Replies: 184
- Views: 259993
Re: 2011 Events Discussion
At last stable beams!
Hey, the scale of the luminosity axis on the LHC dashboard reaches from 0 to 1664 s/µb...
I think that's made by purpose (cf. french beer brand) XD
Hey, the scale of the luminosity axis on the LHC dashboard reaches from 0 to 1664 s/µb...
I think that's made by purpose (cf. french beer brand) XD
- Thu May 26, 2011 8:52 pm
- Forum: The Accelerator
- Topic: The cost of days without runs
- Replies: 5
- Views: 9367
Re: The cost of days without runs
Isn't it possible to take advantage of this recovery time to work on some other independent parts of the machine?
For example right now they are performing "rf interlock tests" while the cryo is recovering...
For example right now they are performing "rf interlock tests" while the cryo is recovering...
- Thu May 26, 2011 4:38 pm
- Forum: The Accelerator
- Topic: The cost of days without runs
- Replies: 5
- Views: 9367
Re: The cost of days without runs
Hard to guess... It is direct cost due to the repairs or indirect cost due to the inactivity?
- Tue May 24, 2011 9:54 am
- Forum: The Accelerator
- Topic: 2011 Events Discussion
- Replies: 184
- Views: 259993
Re: 2011 Events Discussion
Does anybody know when they're moving for the next step?
There's nothing on the plan and if my memory's right they've already passed the (3 good fills && 20 hours) of stable beams with 912b.
Or do they want to run for a time with 912b to see how things are doing, like they did with 768b...
There's nothing on the plan and if my memory's right they've already passed the (3 good fills && 20 hours) of stable beams with 912b.
Or do they want to run for a time with 912b to see how things are doing, like they did with 768b...
- Thu May 19, 2011 8:05 pm
- Forum: The Accelerator
- Topic: Newbie: Lumi difference between Atlas and CMS
- Replies: 10
- Views: 15354
Re: Newbie: Lumi difference between Atlas and CMS
Since the new VdM scans the difference disappeared.
If I remember well the lumi in CMS was even slightliy higher than in ATLAS...
If I remember well the lumi in CMS was even slightliy higher than in ATLAS...
- Mon May 16, 2011 10:13 am
- Forum: The Accelerator
- Topic: Facebook page
- Replies: 15
- Views: 185447
Re: Facebook page
I'm sorry... No.Xymox wrote:So everybody go to facebook
- Tue Apr 26, 2011 9:40 am
- Forum: The Accelerator
- Topic: 2011 Events Discussion
- Replies: 184
- Views: 259993
Re: 2011 Events Discussion
The planning says they're going for stable beams with 640 bunches this afternoon...
This would yield between 650 and 750 (µb)-1, depending on the filling scheme.
Good luck guys!
This would yield between 650 and 750 (µb)-1, depending on the filling scheme.
Good luck guys!
- Thu Apr 21, 2011 10:07 pm
- Forum: The Accelerator
- Topic: 2011 Events Discussion
- Replies: 184
- Views: 259993
Re: 2011 Events Discussion
Great! They doubled luminosity in a single week!!
Do you happen to know why the lumi in CMS is always ~10% lower than in ATLAS, though the squeeze is tighter and the number of colliding bunches is the same?
Do you happen to know why the lumi in CMS is always ~10% lower than in ATLAS, though the squeeze is tighter and the number of colliding bunches is the same?
- Thu Apr 21, 2011 9:18 pm
- Forum: The Accelerator
- Topic: 2011 Events Discussion
- Replies: 184
- Views: 259993
Re: 2011 Events Discussion
That's why I said that; I didn't check during the fill...DCWhitworth wrote:Thought they'd make it easily but they only squeezed to 2m not 1.5m
Thanks for your explanation!
They're filling again and the intensities seem slightly higher...
- Thu Apr 21, 2011 7:23 pm
- Forum: The Accelerator
- Topic: 2011 Events Discussion
- Replies: 184
- Views: 259993
Re: 2011 Events Discussion
I was hoping for 500/ub/s easily with 480. Intensity could be higher. Perhaps the next fill will be better. Going up in 144 bunch steps is good. Yes it is a bit disappointing indeed. Perhaps because of the slightly lower bunch intensities (1.1e11 in state of ~1.25e11 for the first runs with 336b).....
- Sat Mar 26, 2011 11:56 am
- Forum: The Accelerator
- Topic: 2011 Events Discussion
- Replies: 184
- Views: 259993
Re: 2011 Events Discussion
Does anybody know the purpose of the current 1.38TeV run?