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A synchrotron-based upgrade of Fermilab accelerator complex for high intensity physics with Project X is described. It consists of: 1 GeV pulse linac, 1-8 GeV superconducting rapid cycling synchrotron (SRCS), dual 8 GeV storage ring (SR1,2), and 60 GeV Main Injector(MI). Pulse linac and SRCS operate at 10 Hz while SR1, SR2, and MI operate at 1.33 Hz. SR1 stores 3 and SR2 4 SRCS pulses making physics cycle 0.7 s. SR1 batch is extracted in 0.5 s at 3 locations of its ring providing beams to kaon and 2 muon experiments. SR2 batch is transferred to MI, accelerated to 60 GeV, and extracted to 3 neutrino production targets for Minos, Nova, and LBNE experiments. Main synchrotron parameters are listed and magnet systems described. Projected beam power is compared to expectations with linac-only based upgrade as well as with current and planned similar accelerator facilities elsewhere.
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