Linear accelerator 2

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Linear accelerators use <a href="/about/engineering/radiofrequency-cavities">radiofrequency cavities</a> to charge cylindrical conductors. The protons pass through the conductors, which are alternately charged positive or negative. The conductors behind them push the particles and the conductors ahead of them pull, causing the particles to accelerate. Small quadrupole magnets ensure that the protons remain in a tight beam.</p> <p>The proton source was a bottle of hydrogen gas at one end of Linac2. The hydrogen was passed through an electric field to strip off its electrons, leaving only protons to enter the accelerator. By the time they reached the other end, the protons had reached the energy of 50 MeV and gained 5% in mass. 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