Rationale for size and number of accelerator rings

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    Accelerator Rings
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Large particle accelerators like CERN utilize multiple accelerator rings of varying diameters to optimize beam preparation for the main ring, similar to how gears function in a truck. The design constraints for selecting the number and size of these rings include factors such as the energy requirements, space availability, and the specific physics goals of the experiments. Often, older accelerator projects are repurposed as pre-accelerators for newer designs, enhancing efficiency and resource utilization. This approach allows for a more streamlined process in achieving high-energy collisions. Understanding these design principles is crucial for advancing accelerator technology and experimental capabilities.
houlahound
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large facilities like CERN have multiple rings of different diameters to prep the beam for the main ring. I get this is something like gears in a truck.

my question is what are the broad design constraints for choosing a specific number of rings of a specific diameter?
 
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Often a previous accelerator project, after it's work is done, it get's commissioned as a pre-accelerator for a newer grand design.
This happened at CERN, I am sure mfb will get on soon to fill you in on the details.
 

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