Synopsis of resistive wall effects in very short wavelength free electron lasers

摘要

The finite resistivity of the beam tube in the wiggler of a free electron laser (FEL) can give rise to longitudinal and transverse effects that may limit the performance of the FEL amplifiers and oscillators. Potential limiting effects may be (1) longitudinal- head-to-tail energy sweep or modulation in a beam pulse train or (2) transverse-coherent transverse oscillation of the beam pulse of pulse train growing from head to tail in a pulse or pulse train. This brief synopsis outlines the constraints placed on FEL design by the wall effects. (GH)