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One
of two electrostatic pre-accs accelerates H- ions to 750 keV.
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The
linac accelerates these ions to 400 MeV
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The
ions are injected over several (up to 12) turns into the booster, and
passed
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through
a foil to strip off the electrons.
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The
booster accelerates the protons from 400 MeV to 8 GeV.
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The
booster lattice is in an offset 15 Hz (line/4) resonant circuit. This sets an overall
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quantum
of time for the whole accelerator (tick, click, clink).
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Instantaneous
15 Hz rep rate routinely achieved.
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Average
rep rate limited by
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Power
dissipation of ramped elements
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Above
ground radiation (safety issues)
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Below
ground radiation (activation issues)
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Some
numbers:
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Historical high*: 3E12 ppp @2.5 Hz (3E16 pph)
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Run II needs: 5E12 ppp @.7 Hz (1.3E16 pph)
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BooNE+Run II: 5E12 ppp @5.7 Hz (1E17 pph)
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NuMI + Run II: 5E12 ppp @3.2 Hz (6E16 pph)
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