Photos of the Damage To the Large Hadron Collider 106
holy_calamity writes "CERN have released images of the damage done to the world's most powerful machine, the Large Hadron Collider, when an electrical fault caused a helium leak. New Scientist has posted them, along with explanations of what you can see. The sudden burst of gas shifted some of the huge superconducting magnets by half a meter, causing at least $21 million in damage."
I liked the earlier description... (Score:5, Informative)
http://news.cnet.com/8301-11386_3-10120215-76.html [cnet.com]
"A resistive zone developed in one of the electrical connections, creating an electrical arc that punctured one of the helium enclosures around a magnet, according to an analysis by CERN. The warming helium expanded in the vacuum enclosure of the central subsector of the pipe, damaging the vacuum barriers separating the central subsector from the neighboring subsectors."
Geordi La Forge couldn't have said it better.
Re:So (Score:2, Informative)
We don't need to rewire the whole system, only a small batch of magnets that received the bad soldering job. The rest are fine, and we now have better ways of checking the soldering points remotely (ie without having to heat up the other 7 sectors of the LHC).
The $21M covers all repair costs, including replacing some of the wiring in a batch of magnets in a particular sector. Actually, part of the plan is to use backup magnets (obviously double checked for this flaw) so as to save some time, but we don't have enough backup magnets to replace all of the ones that need to be fixed.
Re:MRI Quenching (Score:5, Informative)
That's not a feature, that's a side effect. Some types of failure cause the liquid helium to warm up until the magnet is no longer at superconducting temperatures. This causes a sudden resistance, which can damage the magnet, heats the whole system up (boiling off the coolant), et cetera. MRI systems generally have an emergency shutoff feature, the side effect of which is magnet quenching.
In this case, a quench is what happened -- resistance in the circuit caused helium boiloff, which destroyed superconductivity. They have many safeguards for this, as this was well-known before the first MRI or superconducting collider was built. Release valves allow the boiling helium to escape, and resistor banks are used to draw off electrical energy from the system. However, their system wasn't sufficient to handle the level of failure that occured.
Re:Wanna bet? (Score:3, Informative)