Analysis of 3-D phase space dynamics of pencil-to-sheet-electron-beam transformation in highly-non-paraxial quadrupole lens system

Summary form only given, as follows. Sheet electron beams have the potential to make possible higher power-sources of microwave radiation due to their ability to transport high currents, at reduced current densities, through a single narrow RF interaction structure. Previous investigations have indi...

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Bibliographic Details
Main Authors: McNeely, M.J., Booske, J.H., Scharer, J.E., Basten, M.A.
Format: Conference Proceeding
Language:English
Subjects:
Drives
Electron beams
Frequency measurement
Intermodulation distortion
Laboratories
Lenses
Numerical simulation
Phase distortion
Phase measurement
Plasma applications
Online Access:Request full text
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Summary:Summary form only given, as follows. Sheet electron beams have the potential to make possible higher power-sources of microwave radiation due to their ability to transport high currents, at reduced current densities, through a single narrow RF interaction structure. Previous investigations have indicated the feasibility for laboratory formation of an elliptical sheet beam using magnetic quadrupoles and a Pierce gun pencil-beam source. The configuration exhibits several unique physical features of phase space evolution not observed in more conventional, paraxial beam transport systems. Previous numerical simulations using MAGIC3-D indicate the r.m.s. phase space volume occupied by the sheetbeam increased longitudinally, which contradicts the principle of phase space conservation for a conservative system (Liouville's theorem). The explanation is that is Liouville's theorem does not strictly apply to r.m.s. emittance calculations and some alternative phase space measure might provide closer agreement with Liouville's theorem. The developed phase space measure is non-statistical and uses principles from mathematical morphology. We discuss and compare the results of numerical simulations using the TRACE3-D and MAGIC3-D codes. In addition, we discuss the morphological algorithm for computing phase space area and compare its results with that of the r.m.s. formalism for calculating phase space area.
ISSN:0730-9244
2576-7208
DOI:10.1109/PLASMA.1999.829367