Page 9 of 13
Re: 2011 Events Discussion
Posted: Thu Jun 16, 2011 2:58 pm
by PhilG
Just 17 days later and they have doubled that to 1/fb
https://lhc-statistics.web.cern.ch/LHC-Statistics/
Re: 2011 Events Discussion
Posted: Sat Jun 18, 2011 9:47 am
by Bornerdogge
Looks like they're going for the next step - 1236b - this afternoon, at last!
Re: 2011 Events Discussion
Posted: Tue Jun 21, 2011 4:24 am
by tomey36
or not
i was excited aswell, i guess they wanted to do one more run to check for any problems after the cryo loss. hoping for tomorrow
Re: 2011 Events Discussion
Posted: Tue Jun 21, 2011 4:10 pm
by oldboson
New production record on a single fill here... #1883 ATLAS yield >47 pb-1 and counting...
Kinda they postponed dumping (15pm, then 18pm, now 18.30pm...) to get a new record, well done guys, the machine is running smoothly!
Oldboson.
Re: 2011 Events Discussion
Posted: Tue Jun 21, 2011 5:55 pm
by conrad
What are -RF problems? What does RF stand for? Why, after 18 hours to prepare, can't the SPS have a beam? a newbie.
Re: 2011 Events Discussion
Posted: Tue Jun 21, 2011 6:49 pm
by Kasuha
conrad wrote:What are -RF problems? What does RF stand for? Why, after 18 hours to prepare, can't the SPS have a beam? a newbie.
RF stands for "Radio Frequency" I believe and it means the high frequency cavities (klystrons) which are accelerating the beam and keeping it organized in bunches.
Postponing beam dump in case there is technical problem on SPS is normal - without SPS they cannot refill.
Re: 2011 Events Discussion
Posted: Wed Jun 22, 2011 9:49 am
by pjotertje
Now.
Protestation movement
no beam, no access
Re: 2011 Events Discussion
Posted: Wed Jun 22, 2011 12:13 pm
by DCWhitworth
pjotertje wrote:Now.
Protestation movement
no beam, no access
Ummm, what ? Page 1 says access ongoing.
Re: 2011 Events Discussion
Posted: Wed Jun 22, 2011 12:42 pm
by pjotertje
DCWhitworth wrote:pjotertje wrote:Now.
Protestation movement
no beam, no access
Ummm, what ? Page 1 says access ongoing.
That was this morning on CPS page!!
Re: 2011 Events Discussion
Posted: Wed Jun 22, 2011 1:18 pm
by StevieB
pjotertje wrote:DCWhitworth wrote:pjotertje wrote:Now.
Protestation movement
no beam, no access
Ummm, what ? Page 1 says access ongoing.
That was this morning on CPS page!!
Something to do with this maybe?
http://cdsweb.cern.ch/journal/CERNBulle ... 7595?ln=en
Re: 2011 Events Discussion
Posted: Wed Jun 22, 2011 3:14 pm
by adam_jeff
pjotertje wrote:DCWhitworth wrote:pjotertje wrote:Now.
Protestation movement
no beam, no access
Ummm, what ? Page 1 says access ongoing.
That was this morning on CPS page!!
There was a 4 hour work stoppage by CERN staff this morning in protest at proposed changes to their pension scheme. I don't know how many people took part or what effect it had on the operation of the various machines though.
Re: 2011 Events Discussion
Posted: Fri Jun 24, 2011 8:07 am
by DCWhitworth
Now filling with 1236 bunches - at last !
Re: 2011 Events Discussion
Posted: Fri Jun 24, 2011 6:03 pm
by jmc2000
DCWhitworth wrote:Now filling with 1236 bunches - at last !
Watch for the spikes in the beam size when filling. It's usually a good indication of things being amiss.
Re: 2011 Events Discussion
Posted: Sun Jun 26, 2011 4:37 pm
by conrad
In the last 24 hours there were 5 successful fills for physics. The average run was about 2 hours. Things kept going wrong. Is this just bad luck?
Re: 2011 Events Discussion
Posted: Sun Jun 26, 2011 6:18 pm
by jmc2000
conrad wrote:In the last 24 hours there were 5 successful fills for physics. The average run was about 2 hours. Things kept going wrong. Is this just bad luck?
They had problems with vacuum in B2 IR4 dumping the beam three times before changing the threshold. I don't think it's anything to do with bad luck as such, but what happens when a large machine is being commissioned in unknown territory.