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Amplification and superradiant emission from a 33.3 GHz free electron laser with a reversed axial guide magnetic field

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2 Author(s)
M. E. Conde ; Dept. of Phys., MIT, Cambridge, MA, USA ; G. Bekefi

A new regime of free-electron laser (FEL) operation using a helical wiggler field and a reversed axial guide magnetic field is reported. The orientation of the axial field is such as to oppose the electron rotation imparted by the helical field. The 33.3-GHz FEL amplifier is driven by a mildly relativistic electron beam (750 kV 300 A, 30 ns) and generates 61 MW of radiation with a 27% conversion efficiency. The results are compared with those obtained when the axial guide field is in its conventional orientation, where considerable loss of power and efficiency is observed

Published in:

IEEE Transactions on Plasma Science  (Volume:20 ,  Issue: 3 )