Large Hadron Collider turns back on - Earth survives!

just wait until they start colliding them.....:boxedin:

(i love how cutting edge physics basically boils down to getting two objects and hitting them together really hard just to see what happens.. :) )
 
andyandy said:
(i love how cutting edge physics basically boils down to getting two objects and hitting them together really hard just to see what happens.. :) )
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From an early-90's British comedy show:
Physics is either accelerating subatomic particles to near light-speeds in an attempt to discover the ultimate origins of the universe, or it's melting some ice in a bucket.
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Seems like there will be no High energy collisions this year, 1,2 TeV in each beam maximum with a little luck. Still makes it the worlds most powerfull accelerator.

A little bit OT, Does anyone know how cold the Tevatron is? As cold as the LHC?
 
I live next door to CERN. There was a very odd smell all across the village yesterday afternoon, but I assume it was because the farmers had been putting stuff on the fields rather than the fabric of space-time being altered.
 
Wallmott said:
Seems like there will be no High energy collisions this year, 1,2 TeV in each beam maximum with a little luck. Still makes it the worlds most powerfull accelerator.

A little bit OT, Does anyone know how cold the Tevatron is? As cold as the LHC?
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And how cold is the RHIC?
 
malbui said:
I live next door to CERN. There was a very odd smell all across the village yesterday afternoon, but I assume it was because the farmers had been putting stuff on the fields rather than the fabric of space-time being altered.
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Likely a spot of dark matter. :o
 
Wallmott said:
Seems like there will be no High energy collisions this year, 1,2 TeV in each beam maximum with a little luck. Still makes it the worlds most powerfull accelerator.

A little bit OT, Does anyone know how cold the Tevatron is? As cold as the LHC?
Click to expand...

The figures I could find for each machines dipole magnets (bending magnets that steer the particles around the corners) are:

RHIC 4.3 - 4.6K

Tevatron 3.56K (lower than original design spec after an upgrade to the cryogenic system)

LHC 1.9K

It seem that the colder the machine is, the higher energies it can achieve. As to why this is I don't know, I'm not a particle physicist but there are some folk here who are.
 
Wallmott said:
A little bit OT, Does anyone know how cold the Tevatron is? As cold as the LHC?
Click to expand...

Yes, it is. They cool the Tevatron down to liquid helium temperatures - about 4 Kelvin.

ETA: My bad, the LHC is cooler than that, about 2 Kelvin. The reason for this is that the cryogenics cool down the superconducting electromagnets which are used to steer and focus the proton beams. At the velocities of the proton beams (roughly 99.9999991% lightspeed) they have an amazingly high relativistic mass and are therefore extremely difficult to turn, which requires a huge magnetic field to provide the necessary Lorentz force to turn the beamline.
 
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