Here is the latest on the Hump from Evian
http://indico.cern.ch/getFile.py/access ... fId=107310
The UPS is now the prime suspect.
Search found 135 matches
- Fri Dec 10, 2010 10:05 am
- Forum: The Accelerator
- Topic: The Hump
- Replies: 20
- Views: 30945
- Tue Nov 16, 2010 9:50 am
- Forum: The Accelerator
- Topic: Prospects for 2011 (via reuters)
- Replies: 12
- Views: 16823
Prospects for 2011 (via reuters)
Interesting and optimistic Reuters report on prospects for next year
http://feeds.reuters.com/~r/reuters/sci ... QU20101115
http://feeds.reuters.com/~r/reuters/sci ... QU20101115
- Tue Nov 16, 2010 9:48 am
- Forum: The Accelerator
- Topic: Current Events Discussion
- Replies: 512
- Views: 613166
Re: Current Events Discussion
The reason for going back to proton physics is that the source of lead ions ran dry. It will take a couple of days to fill it so in the meantime they can do a bit more proton MD. They will return to ion physics on Friday but I guess they might run again and get another three days for protons.
- Sun Nov 07, 2010 7:21 pm
- Forum: The Accelerator
- Topic: What to ask the LHC team about its operations or displays
- Replies: 25
- Views: 33609
Re: What to ask the LHC team about its operations or displays
Z means the atomic number which is 82 for lead, so the energy per ion is 3.5 x 82 TeV
- Sun Nov 07, 2010 6:23 pm
- Forum: The Accelerator
- Topic: Current Events Discussion
- Replies: 512
- Views: 613166
Re: Current Events Discussion
It now says the energy is 3.5 Z TeV. Z is the atomic number which is 82 so the energy per beam is 3.5x82 = 287 TeV. Since there are 208 nucleons in the ion, the energy per nucleon is 287/208 = 1.38 TeV and the centre of mass energy per nucleon is 3x1.38 = 2.76 TeV. That was the number they were talk...
- Tue Oct 26, 2010 7:26 am
- Forum: The Accelerator
- Topic: LHC to shut down for a whole year
- Replies: 8
- Views: 12762
Re: LHC to shut down for a whole year
The latest planning chart shows ion setup starting on 3rd, 4th or 5th of Novemeber depending on how quickly they can collect pp data. Ion physics is due to run from 11th November until 6th December. Obviously these dates can change depending on how things go.
- Mon Oct 25, 2010 9:42 am
- Forum: The Accelerator
- Topic: LHC to shut down for a whole year
- Replies: 8
- Views: 12762
Re: LHC to shut down for a whole year
On Nov 5th they stop proton physics and switch to heavy Ion physics. Then on 6th Dec they close down for the winter until February. There will be meetings in Evian and Chamonix to thrash out a plan for next year.
- Mon Oct 25, 2010 9:34 am
- Forum: The Accelerator
- Topic: What to ask the LHC team about its operations or displays
- Replies: 25
- Views: 33609
Re: What to ask the LHC team about its operations or displays
The nominal spacing is 25ns, and 50ns spacing may start this week.Kasuha wrote: LHC is designed for as low as 50 ns spacing but getting there will take some time.
- Sun Oct 24, 2010 6:51 am
- Forum: The Accelerator
- Topic: What to ask the LHC team about its operations or displays
- Replies: 25
- Views: 33609
Re: What to ask the LHC team about its operations or displays
I think AFS stands for Active Filling Scheme
- Sun Oct 03, 2010 7:56 pm
- Forum: The Accelerator
- Topic: Current Events Discussion
- Replies: 512
- Views: 613166
Re: Current Events Discussion
There was a lot more info about the UFOs on Myers' recent talk http://indico.cern.ch/conferenceDisplay ... fId=105780 slides 22-27 but see the video for the full story.
- Tue Sep 28, 2010 4:30 pm
- Forum: The Accelerator
- Topic: Current Events Discussion
- Replies: 512
- Views: 613166
Re: Current Events Discussion
To put more than 384 bunches in they need to decrease the separation again. That would require more setting up and there isnt time for it. It is better to run as much as possible with 384 bunches to get as much data as possible before they have to stop.
- Tue Sep 28, 2010 6:44 am
- Forum: The Accelerator
- Topic: Current Events Discussion
- Replies: 512
- Views: 613166
Re: Current Events Discussion
They are now on the third good run with 104 bunches, which qualifies them to go to the next step. They seem to keep changing their mind about how long to make the bunch trains. Last week the plan was to start with 8 bunches per train, then 12 then 24. They wanted to keep the number of injections bel...
- Sun Sep 26, 2010 7:06 am
- Forum: The Accelerator
- Topic: Current Events Discussion
- Replies: 512
- Views: 613166
Re: Current Events Discussion
ALICE is designed to study the heavy ion collisions that will run in Novemeber, so it does not need high luminosity now. They have configured the fill to give it just 8 bunch collisions per turn compared to 93 for the others, plus they have offset the beams so they only just collide.
- Sat Sep 25, 2010 11:20 am
- Forum: The Accelerator
- Topic: Current Events Discussion
- Replies: 512
- Views: 613166
Re: Current Events Discussion
Last fill was a bit rubbishy, but it doesn't seem to matter. Next fill 104 bunches ...
- Thu Sep 23, 2010 5:34 pm
- Forum: The Accelerator
- Topic: Current Events Discussion
- Replies: 512
- Views: 613166
Re: Current Events Discussion
20/μb/s at peak, that's twice the previous record.