The Impedance of Flat Metallic Plates with Small Corrugations

K. Bane
This report summarizes recent work on using a device composed of two flat, metallic plates with small corrugations (sometimes called a dechirper) at the end of linac-based, X-ray free electron lasers (FELs) for energy chirp control and as a passive fast kicker. We present an analytical theory of the wakefields/impedances of such dechirpers, followed by comparisons with numerical simulations, and comparisons with measurements at the Linac Coherent Light Source (LCLS). We show that agreement in...
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