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LHC will only operate at half power to try to detect problems earlier

The Large Hadron Collider may usher in a new era of particle physics as the world's most powerful particle accelerator.  However, the LHC has also been the victim of numerous delays, ever since its launch last September failed. 

At launch an electrical fault between two of the magnets reportedly caused an arc of electricity, which in turn triggered a helium leak and explosion.  As a result, the proton tube was contaminated with soot, and the magnets were broken off from their mountings.  Months of repairs revealed more leaks in the vacuum of the insulating layer surrounding the proton tube.

Now the European Center for Nuclear Research, or CERN has declared that the repairs are done.  States CERN in a press release, "[Tests] will initially run at an energy of 3.5 TeV per beam when it starts up in November this year.  This news comes after all tests on the machine's high-current electrical connections were completed last week [the week of July 27], indicating that no further repairs are necessary for safe running."

Still, the restart represents caution on CERN's part -- 3.5 TeV is only half of the beam's full intended operational power.  States CERN Director General Rolf Heuer, "We've selected 3.5 TeV to start because it allows the LHC operators to gain experience [with] running the machine safely while opening up a new discovery region for the experiments."

There remain concerns about whether the device is capable of running at full power.  Describes CERN:

Following the incident of [Sept. 19, 2008] that brought the LHC to a standstill [due to a faulty magnet connection], testing has focused on the 10,000 high-current superconducting electrical connections like the one that led to the fault. These consist of two parts: the superconductor itself, and a copper stabilizer that carries the current in case the superconductor warms up and stops superconducting, a so-called quench. In their normal superconducting state, there is negligible electrical resistance across these connections, but in a small number of cases abnormally high resistances have been found in the superconductor. These have been repaired. However, there remain a number of cases where the resistance in the copper stabilizer connections is higher than it should be for running at full energy.

However, CERN also says that it has tested and repaired a large number of these faulty copper connections.  It says that the final two sectors it tested revealed no abnormalities.  Nonetheless, after all the headaches, it plans to throttle up the 17-mile long accelerator loop slowly, just in case there's still undetected problems.



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RE: better safe than sorry
By lco45 on 8/10/2009 7:39:44 PM , Rating: 2
Because it sucks using gravity only, so for it to suck the dust hard enough to just make it float off the carpet it would need the mass of the earth.
Could get tricky pushing a vacuum cleaner with the mass of the earth.
Even trickier stopping it once you get it up to speed ;-)

Luke


RE: better safe than sorry
By HotFoot on 8/11/2009 10:13:01 AM , Rating: 2
Party pooper.

But it wouldn't need anywhere near the mass of the Earth, considering how much closer the black hole in your vacuum cleaner would be to the object than the centre of the Earth. It's like a small magnet that's really close has a bigger effect than a huge magnet many many miles away.

Anyway, the black hole would be constantly sucking in the atmosphere around it, creating a vaccum, and you'd be cleaning the old-fashioned way, with good ol' static pressure pushing dirt down the tube.

Yes, it's still ridiculous...


RE: better safe than sorry
By MrPoletski on 8/12/2009 4:24:50 AM , Rating: 2
umm, some remedial physics lessons reccomended.

1/r^2 dude.


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