Large Hadron Collider Test

TooFastTim said:
... we find that the field strength required will be 1.221T...
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Some interesting LHC facts:

Number of dipoles 1232
Number of RF cavities 8 per beam
Peak dipole field 8.33 T
Dipole current 15 kA
Dipole temperature 1.9 K
Internal pressure 10-13 atm

The only way they can do this is because the magnets are superconducting, made from niobium-titanium. Here is some useful info on the LHC magnets.
 
Kalvaer said:
Oh and another thing that interesting, Part of the reason why the LHC was built underground was not safety, it was for cost. Building underground allowed them to get away with certain land rights and thus make it cheaper :D
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That's exactly the reason :) When they built LEP (which was in the tunnel that the LHC now uses) it was cheaper to excavate a 27km long tunnel 100km underground, than to buy the land at the surface!

Kalvaer said:
There was also another article where a beam did go off course. I think it was at the tevatron and the punched holes through thier magnets, Do you know which one it was? I've asked Claire but she cant seem to remember :confused:
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yeah... not sure, sorry :o
 
Kalvaer said:
I cant remember what the composition is exactly now (something like carbon/kevlar/lead blocks). Even with the LHC being underground through, a stray beam would break the surface wouldn't it if it couldn't be dumped?
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Graphite/Carbon is commonly used for beam dumps AFAIK. Graphite has a nasty side effect called the Wigner effect. It spontaneously ignites. That's why Windscale had a fire.

Kalvaer said:
There was also another article where a beam did go off course. I think it was at the tevatron and the punched holes through thier magnets, Do you know which one it was? I've asked Claire but she cant seem to remember :confused:
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Oh I've done that! It's pretty common.

Basically the beam is set up at small currents and then the current is ramped up, but if it suddenly does soemthing odd there's not a lot you do about it except scream.
 
TooFastTim said:
I doubt that :D
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Lol sorry I meant 100m

(I blame it on the cold I have that feels like my brain is leaking out my nose)

... also I've just been teaching where I've been talking about the speed of light and so saying "km" a lot :)
 
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claire.lee said:
Some interesting LHC facts:

Number of dipoles 1232
Number of RF cavities 8 per beam
Peak dipole field 8.33 T
Dipole current 15 kA
Dipole temperature 1.9 K
Internal pressure 10-13 atm

The only way they can do this is because the magnets are superconducting, made from niobium-titanium. Here is some useful info on the LHC magnets.
Click to expand...

I was pretty sure I remembered that the field strength was about 8.5 T. It means that theres some room for expansion.

NED (see above) is a 15T dipole!
 
Howzit Claire, I see you've "moved". So did I. Now in Aus with ANSTO.
 
TooFastTim said:
I was pretty sure I remembered that the field strength was about 8.5 T. It means that theres some room for expansion.
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Yeah... though the power to run just gets horrendous. They're planning to run through Nov 09 - Feb 2010 because of the break (they normally shut down over that period) and because electricity prices skyrocket in winter in Europe it's gonna cost an extra 6M euros or something!

TooFastTim said:
NED (see above) is a 15T dipole!
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Sweet!
 
I cant seem to find the original thread in here since I cant search for the word LHC on the forums as its to short. I was able to find this one though so thought I'd use it instead of starting a whole new on and end up having 5 threads in here

Anyway, Claire did an article for cosmic diary for the IYoA and its currently the featured article of the month http://www.cosmicdiary.org/latest_feature.html (Seems that there are some spaces missing though in certain places :D but that's not her fault)

PS: To those interested, she should be leaving for CERN in a months time and hopefully be there for the start up if all goes well. (That's if she every decides to get her VISA's but her tickets are booked.)

I've already got my tickets booked and just need one more VISA that we need to get together and I'll be joining her in Geneva ............ if they haven't blown it up yet on the 11th of December
 
How long are you in Geneva? I might be joining you guys in the new year. New Saffie head of the Aus nuclear board is hell bent on a big proton synchrotron and I'm on the steering committee.
 
Kalvaer said:
I cant seem to find the original thread in here since I cant search for the word LHC on the forums as its to short. I was able to find this one though so thought I'd use it instead of starting a whole new on and end up having 5 threads in here
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google is your friend ;)

"lhc site:mybroadband.co.za/vb"

I've already got my tickets booked and just need one more VISA that we need to get together and I'll be joining her in Geneva ............ if they haven't blown it up yet on the 11th of December
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My cousin, who lives in Switzerland, says they've already had temps below 0°C, so enjoy!
 
I think Al meant the outside ambient temperature :)
I'm fine with that though, I wanna do some snow boarding while I am there.

TFT, Claire will be there for 5-6 weeks, I'm only spending a weeke there and heading off to the UK for 3 weeks. You can join us if you want for new years, Tickets from Geneva to the UK are 38 pounds... Makes me sick thinking about it and how they rip us off here
 
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Kalvaer, dunno what's happening before the new year but I'll keep you and Clair posted.

I was a bit sarcy with Big Al but last I heard was that 'bout 80% of the LHC was at operating temps (+- 2.7K, which is a "tad" off ambient). They successfully inject lead (Pb) ions into the LHC but not around it.

Tell Clair to have a look on FB, I've sent her a friend request. It'll be easier than talking thru' forums.
 
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Kalvaer said:
I think Al meant the outside ambient temperature :)
I'm fine with that though, I wanna do some snow boarding while I am there.
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I wouldn't mind going to have a look at the LHC myself (even though it's not in my field), but couldn't handle those outside temps. So, do enjoy the snowboarding, and don't forget the pics!
 
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