電子ストレージリングにおけるダストトラッピング現象

概要

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Stored beams in electron storage rings are susceptible to the trapping of a micron-sized dust particle. This phenomenon, called “dust trapping”, can significantly reduce the beam lifetime and occasionally lasts for tens of minutes, whereby the experiments utilizing accelerator beams can be severely disrupted. Numerous observations and theoretical analyses have led to some credible models, for instance, the stably trapped dust particle reaches thermal equilibrium between energy transfer from the electron beam and cooling by heat radiation. Recently the trapped dust was found to be observable by video cameras, and the visual observation is becoming a promising method for the dust-trapping research.