【摘 要】
：
In this paper, a new mechanism of electromagnetic instability, the induced ion-channel instability, is studied. It is based on the transverse driven betatron os
【机 构】
：
Shanghai Institute of Applied Physics
【基金项目】
：
国家重点基础研究发展计划(973计划);上海市科委资助项目;the Exploration Project of Knowledge Innovation Program of CAS
论文部分内容阅读
In this paper, a new mechanism of electromagnetic instability, the induced ion-channel instability, is studied. It is based on the transverse driven betatron oscillation of relativistic electron beam induced by an additional magnetic undulator with a period close to the betatron wavelength in an ion channel. As its amplitude is sensitive to the electron beam energy, the driven betatron oscillation may determine electron beam grouping in the ponderomotive potential by selecting the undulator strength and period, and it provides a new mechanism of electron bunching, resulting in electromagnetic instability. Under proper condition, a new free-electron laser based on this mechanism may be realized.
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