Search found 288 matches

by Harbles
Sat Jan 02, 2010 3:44 am
Forum: New Users Start Here
Topic: HAPPY NEW YEAR!!!!!!!!!!!!!
Replies: 5
Views: 2359

Re: HAPPY NEW YEAR!!!!!!!!!!!!!

It's the twenty-tens for the next three years then it's the twenty-teens.
Enquiring minds want to know.
by Harbles
Mon Dec 21, 2009 2:33 am
Forum: Off topic
Topic: Happy Holidays!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Replies: 46
Views: 32385

Re: Happy Holidays!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

:scared-shocked: :happy-jumpyellow: :angry-screaming: :angry-steamingears: :violence-smack: :happy-jumpyellow: :scared-eek: :axe: :Heart: :angry-banghead: :sleeping-blue: :violence-smack: :goodman: :angry-chillpill: :angry-fire: :angry-tappingfoot: :scared-yipes: :scared-eek: :o :lol: :whistle: :pra...
by Harbles
Sun Dec 20, 2009 12:35 am
Forum: The GRID
Topic: CERN selects cloud computing partner
Replies: 3
Views: 11449

Re: CERN selects cloud computing partner

I was hoping it would be Google. They are doing amazing things with their in house designed server container data centre systems. http://www.youtube.com/watch?v=zRwPSFpLX8I And the brilliant idea of using motherboards that only need a single 12V supply so that each one has a gel cell battery to act ...
by Harbles
Sat Dec 19, 2009 11:46 pm
Forum: The Accelerator
Topic: LHC Shutdown schedule
Replies: 30
Views: 9293

Re: LHC Shutdown schedule

CERN has installed Helium storage tanks that can hold a fraction of the total amount in the LHC system. So I would assume that is a major factor in managing energy hence most sectors will stay at 4.5 K and act as helium storage. I have been looking for a log note or any other info on the Xmas break ...
by Harbles
Fri Dec 18, 2009 10:31 pm
Forum: The Accelerator
Topic: Daily Schedules and Hiccups
Replies: 41
Views: 13775

Re: Daily Schedules and Hiccups

Re: the PC trips of Tuesday I found an interesting entry in the AB-OP Elog LHC PO HC page at tues 15 Dec 23:02 abut the trip being caused by an unexpected large value short duration input from the real time feedback system. So it sounds like it's some thing they will sort out and not defective hardw...
by Harbles
Thu Dec 17, 2009 3:17 pm
Forum: The Accelerator
Topic: LHC Shutdown schedule
Replies: 30
Views: 9293

Re: LHC Shutdown schedule

I'm going to guess that they will allow sectors with no work scheduled to warm to 4.5 k so they can turn off the 1.8 k compressors, some sectors warm to 70 k for testing and some to warm right up if they need work. I hope it's not many because it will take at least 3 wks to cool down again. You can ...
by Harbles
Thu Dec 17, 2009 3:03 am
Forum: The Accelerator
Topic: LHC Shutdown schedule
Replies: 30
Views: 9293

Re: LHC Shutdown schedule

Well I guess this http://hcc.web.cern.ch/hcc/file/cmm.png answers my earlier question about Cryo maintain over xmas.
by Harbles
Wed Dec 16, 2009 5:27 pm
Forum: The Accelerator
Topic: LHC Shutdown schedule
Replies: 30
Views: 9293

Re: LHC Shutdown schedule

Well that's it for 2009.

AB-OP elog...
" 18:05 While people start drinking, we:
- stop all the magnets;
- clase all the valves;
- prepare access conditions."

And Page 1 message

"That's it folks

See you all next year..."

So no more vistar watching for a while.
by Harbles
Wed Dec 16, 2009 3:13 pm
Forum: New Users Start Here
Topic: Data volumes in pb^-1 and fb^-1
Replies: 2
Views: 1743

Re: Data volumes in pb^-1 and fb^-1

Here is a good item on Luminosity and cross section.

http://dorigo.wordpress.com/2006/08/28/ ... s-section/



Hopefully not a double post as I tried earlier and it never came up on the board.
by Harbles
Wed Dec 16, 2009 2:28 pm
Forum: The Accelerator
Topic: LHC Shutdown schedule
Replies: 30
Views: 9293

Re: LHC Shutdown schedule

Has anyone seen any mention of if they will keep the magnets at 1.9 deg K or let them warm up some to save cooling electricity?
by Harbles
Tue Dec 15, 2009 10:29 pm
Forum: The Accelerator
Topic: Daily Schedules and Hiccups
Replies: 41
Views: 13775

Re: Daily Schedules and Hiccups

They were running nice this afternoon with a 4 bunch at 1.18 TeV beam and another power converter tripped. This seems to be happening a lot. One log mentioned that they had already switched to the second card on that pc. I would love to hear the technical 'discussions' going on about pc reliability ...
by Harbles
Tue Dec 15, 2009 3:29 am
Forum: The Accelerator
Topic: basic accelerator theory from a great discussion in chat
Replies: 7
Views: 9624

Re: basic accelerator theory from a great discussion in chat

Very Educational. In the link that PCATOM left https://espace.cern.ch/be-dep/Lists/AXEL%20Courses/AXEL2009.aspx there are .PPT slides of the lectures in the "Introduction to Accelerator Physics" series (at the bottom) basically what he said in chat but expanded with pictures. The Machine courses are...
by Harbles
Tue Dec 15, 2009 12:05 am
Forum: The Accelerator
Topic: OLDER 2/15/10 ** current events and discussion **
Replies: 54
Views: 19170

Re: ** current events and discussion **

Aw They Broke Page one again It's saying 22:59 and it really 01:04 now.

Elog messages say they tried to restart it no joy.
by Harbles
Mon Dec 14, 2009 6:13 pm
Forum: The Accelerator
Topic: Do they use a check list when restarting the injections?
Replies: 1
Views: 1630

Do they use a check list when restarting the injections?

I 've been following along this afternoon and twice now they had the wrong settings for injection. First had the RF freq at 1.18 TeV setting not 450GeV injection freq. Then had the beam tune feedback set wrong. I guess if all you is loose a little time then no big deal but this sound like the sort o...
by Harbles
Sun Dec 13, 2009 3:05 am
Forum: The Accelerator
Topic: Next generation of collider to replace the LHC
Replies: 13
Views: 4567

Re: Next generation of collider to replace the LHC

And an interesting article.
Future colliders: Beyond the LHC
http://www.newscientist.com/article/mg2 ... e-lhc.html