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Re: The energy missing...Halted!!!








Section damaged


On Friday, a failure, known as a quench, caused around 100 of the LHC's super-cooled magnets to heat up by as much as 100C.


The fire brigade were called out after a tonne of liquid helium leaked into the tunnel at Cern, near Geneva.


More at link... :confused:



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Re:Back to the past... The energy missing...




The first beams were fired successfully around the accelerator's 27km (16.7 miles) underground ring over a week ago.


The crucial next step is to collide those beams head on. However, the fault appears to have ruled out any chance of these experiments taking place for the next two months at least.


The quench occurred during final testing of the last of the LHC's electrical circuits to be commissioned.


At 1127 (0927 GMT) on Friday, the LHC's online logbook recorded a quench in sector 3-4 of the accelerator, which lies between the Alice and CMS detectors.


The entry stated that helium had been lost to the tunnel and that vacuum conditions had also been lost.


The superconducting magnets in the LHC must be supercooled to 1.9 Kelvin (-271C; -456F), to allow them to steer particle beams around the circuit.


As a result of the quench, the temperature of some magnets in the machine's final sector rose dramatically.


The setback came just a day after the LHC's beam was restored after engineers replaced a faulty transformer that had hindered progress for much of the past week.







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Re:First Images Emerge of Damage to the LHC




On September 19th, CERN announced that the Large Hadron Collider had suffered a major incident, known as a "quench". An electrical short between two of the superconducting magnets had kick-started a helium coolant leak inside the tunnels housing the accelerator ring. The quench caused the magnets to rapidly heat up, severely damaging them. The violent release of coolant ripped equipment from their concrete anchors, ensuring a huge repair operation would need to be carried out. However, it was a while before engineers were able to access the damage and the news wasn't good: The LHC would be out of commission until the spring of 2009 at the earliest. That was such a sad day.




Caption said:


In this second image, the extent of the damage is pretty clear. Assuming the accelerator beam-line used to be straight (unfortunately, there is no "before" picture), the violent displacement of a huge magnet (weighing several tonnes) is obvious.


takken from:


Link to universetoday.com :confused:



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