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Radiation damping
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<p>Radiation damping in <a href="/facts/Accelerator_physics/2cgsbvQ6">accelerator physics</a> is a phenomenon where <a href="/facts/Betatron_oscillations/fpNcRWQ3">betatron oscillations</a> and longitudinal oscillations of the particle are damped due to energy loss by <a href="/facts/Synchrotron_radiation/mTsSKmRz">synchrotron radiation</a>. It can be used to reduce the <a href="/facts/Beam_emittance/r2RFcRs4">beam emittance</a> of a high-velocity <a href="/facts/Charged_particle_beam/aES4kaGn">charged particle beam</a>. </p><p>The two main ways of using radiation damping to reduce the emittance of a particle beam are the use of <i>undulators</i> and <i>damping rings</i> (often containing undulators), both relying on the same principle of inducing <a href="/facts/Synchrotron_radiation/mTsSKmRz">synchrotron radiation</a> to reduce the particles' momentum, then replacing the momentum only in the desired direction of motion. </p>