Search found 20 matches

by BenM
Sat Jun 25, 2011 5:34 am
Forum: The Accelerator
Topic: Does beam size spike when ramping up energy cause problems?
Replies: 5
Views: 1755

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...
by BenM
Mon May 30, 2011 9:19 pm
Forum: The Accelerator
Topic: Clock Distribution
Replies: 4
Views: 2054

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...
by BenM
Fri May 27, 2011 5:45 am
Forum: The Accelerator
Topic: Clock Distribution
Replies: 4
Views: 2054

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...
by BenM
Thu May 26, 2011 9:53 pm
Forum: The Accelerator
Topic: Clock Distribution
Replies: 4
Views: 2054

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...
by BenM
Sat Apr 23, 2011 5:24 pm
Forum: The Accelerator
Topic: NEW INTENSITY WORLD RECORD !!
Replies: 3
Views: 3244

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!!!

B.
by BenM
Wed Mar 16, 2011 6:40 pm
Forum: Off topic
Topic: When is your Birthday?
Replies: 9
Views: 4038

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 :)
by BenM
Fri Mar 04, 2011 6:32 pm
Forum: The Accelerator
Topic: 2011 Events Discussion
Replies: 184
Views: 42737

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...
by BenM
Fri Feb 25, 2011 7:16 am
Forum: Controversial topics
Topic: What happens when you stick your head in an accelerator
Replies: 5
Views: 6377

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...
by BenM
Mon Dec 06, 2010 4:35 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 86057

Re: Current Events Discussion

tomey36 wrote:today is the last day of the phyics runs this year.
Is it? the schedule shows physics up to Friday...

B.
by BenM
Sat Nov 20, 2010 5:15 pm
Forum: Off topic
Topic: Tell me something exciting!!!
Replies: 17
Views: 3690

Re: Tell me something exciting!!!

Something exciting? A trip to the loo after one of my Chilli-con-Carnes - both exiting and exciting :P ... coincidentally there is one on the stove right now :angry-fire:
by BenM
Tue May 18, 2010 11:03 am
Forum: The Accelerator
Topic: COOL links
Replies: 57
Views: 20727

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
by BenM
Thu Mar 25, 2010 12:32 pm
Forum: The Accelerator
Topic: 2010 Briefings, Schedules and Problems
Replies: 48
Views: 10320

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 :D

B.
by BenM
Tue Mar 16, 2010 4:37 pm
Forum: End Of The World
Topic: Tinfoiltards mentioned in El. Reg.
Replies: 13
Views: 4942

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

B.
by BenM
Tue Mar 02, 2010 4:14 pm
Forum: The Accelerator
Topic: COOL links
Replies: 57
Views: 20727

Re: COOL links

spagettifide
Anything to do with his noodly greatness? :lol: :lol: :lol:
by BenM
Wed Dec 16, 2009 3:32 pm
Forum: The Accelerator
Topic: LHC Shutdown schedule
Replies: 30
Views: 6259

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 ...