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Cooling of Ultracold Neutrons by Propagating Magnetic Field

Since a neutron has a magnetic moment, it interacts with a magnetic field. A possible configuration to confine ultracold neutrons (UCN) is a combination of a toroidal multipole field and a toroidal field; the latter prevents spin flip at the separatrix of the multipole field. It results in effective cooling to apply an appreciable ripple to the toroidal field which propagates at the resonant phase velocity. The cooling rate which is the power removed by a propagating toroidal magnetic wave was obtained through the quasilinear theory of the transit-time dumping for a plasma, and compared to the particle simulations.