Fermi National Laboratory

Operation Terminology

Bunch Rotation

Prior to extraction from the Main Injector at 120 GeV, the proton bunches destined to be used for antiproton production are rotated in momentum phase space by 90º so that a large momentum spread and smaller time spread (a given bunch is narrower in time) comes about. The antiprotons produced retain this structure. Upon injection into the Debuncher, the bunches are rotated 90º thereby reducing the momentum spread and broadening the time structure. This permits the Δ p/p of the antiproton injected into the accumulator to be greatly reduced, permitting smaller magnet apertures and more effective stochastic cooling.

last modified 10/28/2005   email Fermilab
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