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field that can be produced with modern dipole electromagnets require synchrotrons/cyclotrons to increase in size (thus increasing the number of dipole magnets used) to compensate for increases in particle velocity. In the largest modern synchrotron, the
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form simple closed loops which emerge from the north pole, re-enter at the south pole, then pass through the body of the magnet. The simplest example of a dipole magnet is a
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Magnetic field of a cylindrical dipole magnet with a gap of near-constant field in the center. The same field configuration is obtained from two stacked current loops.
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to the direction of particle motion, and free in the direction orthogonal to it. Thus, a particle injected into a dipole magnet will travel on a circular or
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proton and ion accelerators. As the energy of the accelerated particles increases, they require more force to change direction and require larger
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The amount of force that can be applied to a charged particle by a dipole magnet is one of the limiting factors for modern
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over some distance. Particle motion in that field will be circular in a plane that is perpendicular to the field and
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trajectory. By adding several dipole sections on the same plane, the bending radial effect of the beam increases.
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in the design trajectory (or 'orbit') of the particles, as in circular accelerators. Other uses include:
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The force on a charged particle in a particle accelerator from a dipole magnet can be described by the
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Other uses of dipole magnets to deflect moving particles include isotope mass measurement in
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Such magnets are also used in traditional televisions, which contain a
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