Why must the electron beam be contained in an Ultra High Vacuum?
If the electrons were to travel through air as they orbited the storage ring they would quickly collide with air molecules and be lost from the electron beam. To minimise these losses, the electrons circulate around the storage ring in a vacuum chamber in which the pressure has been reduced to approximately one million million times lower than atmospheric pressure. At this pressure the useful lifetime of the electron beam is about 20 hours.
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