system
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human
What is the inside of the The Large Hadron Collider made of? and why that material particles doesn't gets accelerated as well?

[Title]
gpt
The machines themselves are made of many materials. For example you've got beam pipes which can be made of metals like aluminum. Then you've got NbTi (niobium-titanium alloys) for superconducting coils or SRF cavities. You've got iron for magnet cores, copper, steel, etc.

But the insides of the cavities and beamlines are held at very high vacuum. While there will always be some stray gas molecules inside the vacuum vessels, the vast majority of them are removed using very powerful pumps. These gas molecules are generally not electrically charged, so they are not affected by the electric and magnetic fields which may be present.