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<p>(<b>PSB</b>), which accelerates the protons to 2 GeV, followed by the PS, which pushes the beam to 25 GeV. The protons are then sent to the Super Proton Synchrotron, and accelerated to 450 GeV before they are injected into the LHC. The PS also accelerates heavy <a href="page.php?w=ion">ion</a>s from the <a href="page.php?w=Low_Energy_Ion_Ring">Low Energy Ion Ring</a> (<b>LEIR</b>) at an energy of 72 MeV, for collisions in the LHC.</p>

<p><big>Background</big></p>
<p>The <a href="page.php?w=synchrotron">synchrotron</a> (as in Proton Synchrotron) is a</p><p>
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