Byrd J M, Leemans W P, Loftsdottir A, Marcelis B, Martin Michael C, McKinney W R, Sannibale F, Scarvie T, Steier C
Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, USA.
Phys Rev Lett. 2002 Nov 25;89(22):224801. doi: 10.1103/PhysRevLett.89.224801. Epub 2002 Nov 8.
Bursts of coherent synchrotron radiation at far-infrared and millimeter wavelengths have been observed at several storage rings. A microbunching instability has been proposed as the source for the bursts. However, the microbunching mechanism has yet to be elucidated. We provide the first evidence that the bursts are due to a microbunching instability driven by the emission of synchrotron radiation in the bunch. Observations made at the Advanced Light Source are consistent with the values predicted by the proposed microbunching model. These results demonstrate a new instability regime for high energy synchrotron radiation sources and could impact the design of future sources.
在几个储存环中观测到了远红外和毫米波波长的相干同步辐射爆发。一种微聚束不稳定性已被提出作为爆发的源头。然而，微聚束机制尚未得到阐明。我们提供了首个证据，表明这些爆发是由束团中同步辐射的发射驱动的微聚束不稳定性所致。在先进光源上所做的观测与所提出的微聚束模型预测的值相符。这些结果证明了高能同步辐射源的一种新的不稳定性机制，并且可能会影响未来光源的设计。
