增頻磁鐵(英語:wiggler)是應用在同步加速器中的一種裝置[1],內置很多磁體,以特定的方式排列,使得帶電粒子束通過時產生橫向週期性往復擺動,這導致其加速度發生變化,因而能夠釋放與電子束方向相切的同步輻射。
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