CMS means Compact Muon Solenoid... but it is very big! It is in a cavern underground, 90 metres deep... This is like a 30-floor building. Fortunately, there's an elevator! Near the cavern where the detector is, there is a smaller cavern that houses all the computers and electronics needed to control the operation of the detector, and to store all the data that it generates. There are lots of aisles full of computers:
And also many other scientific equipment:
These computers generate so much heat that they have to put huge fans to cool them:
This is the "old" control room, from where they made sure that everything was working fine when they built the detector.
With so many computers, you need lots of cables to move the data from here to there, so this is how the space between floors looks like...
Safety is taken very seriously: there are lots of cabinets with protective equipment.
This is how the 27-km-long tunnel looks like... unfortunately we couldn't visit it, but they have a nice poster to get an idea.
And here is one photo of the detector... doesn't it remind you of an spacecraft from "Star Wars"?
And,, finally, here I am in front of the detector, with the guide that showed us everything.
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