Any perturbation, however, such as a bad soldering job on a splice, can cause resistance and heat the cable and cause it to lose its superconductivity in what physicists call a “quench.” Which is what happened on Sept. 19, when the junction between two magnets vaporized in a shower of sparks, soot and liberated heliumSuch was the day when the Large Hadron Collider went bung last year.
Not to mention the day they switched it back on, after repairs, to find that the biggest, most expensive physics machine in the world is still puttering along with thousands of bad electrical connections.
Handy dandy fact: magnets can be trained, and they can, mysteriously, lose their training, especially if trained-up then left sitting about for a year doing not much of anything. Kinda makes me want to rush out and buy a pet magnet.
Giant partical collider struggles