Longitudinal 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 passing the resultant "rainbow" beam though a tapered wedge of cooling material. Thus, faster particles are cooled more and slower particles are cooled less. 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.
Read more about this topic: Ionization Cooling
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