Abstract
The "fast kicker" of the Brookhaven National Laboratory's AGS, normally used for orbit perturbation at high energy as part of the fast ejected beam system is used to eject the circulating proton beam in the energy region of 50-400 MeV. Beam behavior in the early part of the acceleration cycle is studied by measuring the ejected beam vertical phase space emittance and density distribution. Effective phase space dilution and beam intensity dependent effects have been observed. The observed distributions are consistent with a four or six dimensional gaussian distribution.

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