Closing the Gap: The Evolution of CMS at CERN

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Discussion Overview

The discussion revolves around the operational status and structural design of the Compact Muon Solenoid (CMS) at CERN, particularly focusing on the gap between its two halves during maintenance phases and how they are brought together for operation. The scope includes technical explanations and conceptual clarifications regarding the CMS detector's functionality and maintenance procedures.

Discussion Character

  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant questions whether the gap in the CMS is sealed and if the picture was taken before it started operating.
  • Another participant clarifies that the CMS is shown during a maintenance phase when the detector is opened, which occurs typically every winter.
  • A participant expresses satisfaction with their understanding and asks how the two halves of the detector are brought together after maintenance, noting the absence of visible rail mechanisms.
  • A response indicates that the halves can float on air pads to move together, referencing structural elements visible in the CMS design.
  • Additional links to resources and photos are shared to provide further context and visual understanding of the CMS structure.

Areas of Agreement / Disagreement

Participants generally agree on the operational procedures during maintenance phases, but there are questions regarding the specific mechanisms used to align the two halves of the CMS, indicating some uncertainty about the details of the design.

Contextual Notes

The discussion does not resolve the specifics of the mechanism used to bring the halves together, leaving some assumptions about the design and operational procedures unaddressed.

Who May Find This Useful

Individuals interested in particle physics, engineering design of particle detectors, or the operational procedures at CERN may find this discussion relevant.

YoungPhysicist
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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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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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Thanks! I am correct for the first time! By the way, I got another question: when the maintenance 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)
 
Thanks you so much!
 
Last edited:

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