Main Injector
The Main Injector, completed in 1999, has become Fermilab's "particle switchyard" with three functions: it accelerates protons; it delivers protons for antiproton production; it accelerates antiprotons coming from the Antiproton Source. Inside the Main Injector tunnel, physicists have also installed an Antiproton Recycler (green ring). It stores antiprotons that return from a trip through the Tevatron, waiting to be re-injected.

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