CMS gap problem

  • #1
In this picture of CMS, there is a huge gap between the two sides. There is no way that the collision occur directly in midair right?

So is the gap already been sealed? ( which means the picture was taken before it started to operate) Or I am completely wrong?
 

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  • #2
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You see CMS during a maintenance phase where the detector was opened to access it. This typically happens every winter, with longer shutdowns (for 1-2 years) every few years.
During collisions it is closed.
 
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  • #3
Thanks! I am correct for the first time! By the way, I got another question: when the maintainance is over, are the detector’s two halves brought together to seal the gap or an extra section is removed while mainiainance and installed back afterwards?(Since I didn’t see any sign of some sort of rail mechanism which makes the two halves moveable)
 

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