|TUPB021||Study of Plasma Effect in Longitudinal Space Charge Induced Microbunching Instability||522|
The longitudinal space charge (LSC) plays an important role in introducing the microbunching instability in the LINAC of a free electron laser (FEL) facility. The current model of LSC impedance  derived from the fundamental electromagnetic theory  is widely used to explain the growth of the microbunching instability . However, in the case of highly bright relativistic electron beams, the plasma effect starts to play a role. In this article, the basic model of LSC impedance including the plasma effect is built , and the modifications to the microbunching instability based on the new model are discussed in various conditions.
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