Search found 20 matches
- Sat Jun 25, 2011 5:34 am
- Forum: The Accelerator
- Topic: Does beam size spike when ramping up energy cause problems?
- Replies: 5
- Views: 8814
Re: Does beam size spike when ramping up energy cause proble
I would hazard a guess at the beam size spike being a symptom of a problem rather than the cause of a problem... it could be all sorts of things - including not really there at all and just a "feature" of the instrumentation under certain conditions. I get the impression that a large percentage of t...
- Mon May 30, 2011 9:19 pm
- Forum: The Accelerator
- Topic: Clock Distribution
- Replies: 4
- Views: 8487
Re: Clock Distribution
Thanks pcatom... millisecond timing I can cope with - after all ntp manages that just fine so it must be a relativley simple problem :D My brain melts just thinking about how to account for propagation losses at a sub nanosecond level; I am glad there are many more clever people than I on the proble...
- Fri May 27, 2011 5:45 am
- Forum: The Accelerator
- Topic: Clock Distribution
- Replies: 4
- Views: 8487
Re: Clock Distribution
Thanks for that link... it goes some way towards sorting it out in my head... I guess what I am looking for is how the trigger processors get the clock signal to the experiements before the beam arrives... thinking aloud - if the clock signal is just used to discipline :violence-stickwhack: the expe...
- Thu May 26, 2011 9:53 pm
- Forum: The Accelerator
- Topic: Clock Distribution
- Replies: 4
- Views: 8487
Clock Distribution
I can sort of understand how a clock is distributed across the circuits in a CPU and how the separate injection points can be made to run in synch however on the scale of a chip the distances and therefore propagation times are tiny. On a machine as big as the LHC complex, just how do they make sure...
- Sat Apr 23, 2011 5:24 pm
- Forum: The Accelerator
- Topic: NEW INTENSITY WORLD RECORD !!
- Replies: 3
- Views: 8531
Re: NEW INTENSITY WORLD RECORD !!
seems they will be breaking their own record fairly regularly now... just seen 5.2/4.8 on the progress table... onwards and upwards!!!
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- Wed Mar 16, 2011 6:40 pm
- Forum: Off topic
- Topic: When is your Birthday?
- Replies: 9
- Views: 15386
Re: When is your Birthday?
mine is 10th April... how many years ago I don't wish to remember - but at least 20 years fewer than some of the other posters here I think
- Fri Mar 04, 2011 6:32 pm
- Forum: The Accelerator
- Topic: 2011 Events Discussion
- Replies: 184
- Views: 260262
Re: 2011 Events Discussion
does anyone know why the beam intensity plots have swapped from being a nice line trace to being all spiky and, effectively, a filled in histogram? The spikes go to 4E15 protons which seems a little high to me and could possibly be noise in the measurement system however that is mere speculation. Ed...
- Fri Feb 25, 2011 7:16 am
- Forum: Controversial topics
- Topic: What happens when you stick your head in an accelerator
- Replies: 5
- Views: 18964
Re: What happens when you stick your head in an accelerator
On a serious note, it shows how much force and energy is going on at LHC while some like to refer to a mosquito in flight. The mosquito thing is right..... for individual protons. There are quite a few (British understatement there!) protons in a bunch and quite a few bunches in each ring. One thin...
- Mon Dec 06, 2010 4:35 pm
- Forum: The Accelerator
- Topic: Current Events Discussion
- Replies: 512
- Views: 615028
Re: Current Events Discussion
Is it? the schedule shows physics up to Friday...tomey36 wrote:today is the last day of the phyics runs this year.
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- Sat Nov 20, 2010 5:15 pm
- Forum: Off topic
- Topic: Tell me something exciting!!!
- Replies: 17
- Views: 22796
Re: Tell me something exciting!!!
Something exciting? A trip to the loo after one of my Chilli-con-Carnes - both exiting and exciting ... coincidentally there is one on the stove right now
- Tue May 18, 2010 11:03 am
- Forum: The Accelerator
- Topic: COOL links
- Replies: 57
- Views: 85184
Re: COOL links
Don't know if this counts as cool... a report (of sorts) about the LHC... I suspect there are one or two inaccuracies in there - typical journalists.
http://news.bbc.co.uk/1/hi/sci/tech/8685541.stm
http://news.bbc.co.uk/1/hi/sci/tech/8685541.stm
- Thu Mar 25, 2010 12:32 pm
- Forum: The Accelerator
- Topic: 2010 Briefings, Schedules and Problems
- Replies: 48
- Views: 61272
Re: 2010 Briefings, Schedules and Problems
Seems there was an emergency beam dump at 12:20-12:40ish CET ... after quite a while with beams running at 3.5TeV. Hope it isn't anything serious - but as it is commented on as successful I guess it was a useful test of the nQPS
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- Tue Mar 16, 2010 4:37 pm
- Forum: End Of The World
- Topic: Tinfoiltards mentioned in El. Reg.
- Replies: 13
- Views: 19610
Tinfoiltards mentioned in El. Reg.
oh yes, Lewis Page fined new sources of mirth and hilarity... see towards the end of the comments for a giggle (where the TFTs have posted that the El. Reg. article is favourable.... guess they don;t get irony)
Anyway enough of my rambling - Linkie
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Anyway enough of my rambling - Linkie
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- Tue Mar 02, 2010 4:14 pm
- Forum: The Accelerator
- Topic: COOL links
- Replies: 57
- Views: 85184
Re: COOL links
Anything to do with his noodly greatness?spagettifide
- Wed Dec 16, 2009 3:32 pm
- Forum: The Accelerator
- Topic: LHC Shutdown schedule
- Replies: 30
- Views: 39025
Re: LHC Shutdown schedule
I suspect the chilling load is actually quite small... the magnets take all the current (proportionally speaking). If they switch off the chilling they will have to start a large proportion of the commissioning again - if the temperature, of the magnets, rises too much I suspect that thermal stress ...