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Theoretical studies of the ion-hose instability in a plasma-focused free-electron laser

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3 Author(s)
Whittum, David H. ; Nat. Lab. for High Energy Phys., Ibaraki, Japan ; Hiramatsu, S. ; Kim, J.-S.

An `ion-focused' relativistic electron beam traversing a magnetic wiggler is subject to a transverse two-steam or `in-hose' instability, resulting from the coupling of transverse displacements of the beam centroid to the `slosh' motion of the (beam-focused) nonneutral ion plasma, and driven by the `V×B' deflection in the wiggler field. The equations of motion are resolved into an inhomogeneous `beam breakup' equation, and asymptotic growth is computed in the limit of linear focusing. The effect of nonlinearities is assessed numerically with a `distributed-mass' model. As examples, ion-hose growth is considered in a UV FEL and a microwave FEL two-beam accelerator

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Plasma Science, IEEE Transactions on  (Volume:21 ,  Issue: 1 )