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Major components of circular particle accelerators (for example LHC in CERN) are its magnets. In this Demonstration, you can study the forces on moving charged particles in a magnetic field. The locator represents a particle moving perpendicularly to the screen. If the particle is positively charged, it moves in the direction into the screen, away from you; if the particle is negative, it moves in the direction out of the screen, toward you. Magnetic dipoles are used to deflect the particle beam into a circular orbit. Magnetic quadrupole magnets, in addition, focus the beam in a transverse plane (vertically by focusing or horizontally by defocusing). Magnetic sextupoles are used to focus the beam in a longitudinal direction (changing the so-called chromaticity of the beam).
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