In accelerator physics, ionization cooling is a process by which the emittance of a charged particle beam can be reduced . In ionization cooling, particles are passed through some material. The momentum of the particles is reduced as they ionize atomic electrons in the material. Thus the normalised beam emittance is reduced. By re-accelerating the beam, for example in an RF cavity, the longitudinal momentum may be restored without replacing transverse momentum. Thus overall the angular spread and hence the geometric emittance in the beam will be reduced.
Ionization cooling can be spoiled by stochastic physical processes. Multiple Coulomb scattering in muons as well as nuclear scattering in protons and ions can reduce the cooling or even lead to net heating transverse to the direction of beam motion. In addition, energy straggling can cause heating parallel to the direction of beam motion.
Other articles related to "ionization cooling, cooling":
... The technique can be adapted to provide longitudinal as well as transverse cooling by using a dipole magnet as a dispersive prism to divide the particles by energy, and then ... A simple way is to fill the dipole itself with cooling material, so that more energetic particles following a larger orbit pass are cooled more ...
... The International Muon Ionization Cooling Experiment (or MICE) is a high energy physics experiment designed to observe ionization cooling of muons ... MICE will reduce 6D emittance over a single 5.5 m cooling cell and measure that reduction ... MICE will measure cooling performance over a range of beam momenta between about 150 and 250 MeV/c, for various absorber materials and magnetic field ...
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