The Large Hadron Collider is such a huge and sophisticated machine that the slightest alteration requires an enormous amount of work. During the second long shutdown (LS2), teams are hard at work reinforcing the electrical insulation of the accelerator’s superconducting dipole diodes. The LHC contains not one, not two, but 1232 superconducting dipole magnets, each with a diode system to upgrade. That’s why no fewer than 150 people are needed to carry out the 70 000 tasks involved in this work.
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Source: Phys.org