Title :
Modeling and analysis of a high current electron beam focused by a permanent-magnet quadrupole lattice in a helical traveling-wave circuit
Author :
Abe, D.K. ; Levush, B. ; Petillo, J.J. ; Kishek, R.A. ; Chernin, D.
Author_Institution :
U.S. Naval Res. Lab., Washington, DC, USA
Abstract :
In comparison to conventional periodic permanent-magnet (PPM) lattices, the periodic permanent-magnet quadrupoles (PMQ) lattices have the potential to provide the strong focusing required to transport higher current electron beams. Here, analyses of the interaction between the elliptical beam formed by the PMQ lattice and a helical traveling-wave circuit are presented. The large-signal traveling-wave tube (TWT) code, CHRISTINE 1-D, have used to explore the sensitivity of the amplifier performance to variations in beam radius. In addition to enabling higher rf power operation, also showed the higher beam currents afforded by PMQ focusing enable a higher power gain per unit length and the result in more compact form factors and higher amplifier power densities compared with PPM-focused circuits.
Keywords :
electron beam focusing; form factors (nuclear); nuclear electronics; permanent magnets; travelling wave tubes; CHRISTINE 1-D; PMQ focusing; PMQ lattices; PPM lattices; PPM-focused circuits; TWT code; amplifier sensitivity performance; beam currents; beam radius; compact form factors; conventional periodic permanent-magnet; elliptical beam; helical traveling-wave circuit; high current electron beam; higher amplifier power densities; higher rf power operation; large-signal traveling-wave tube code; permanent-magnet quadrupole lattice; Circuits; Design methodology; Design optimization; Electron beams; Laboratories; Lattices; Particle beams; Plasma devices; Radiofrequency amplifiers; USA Councils;
Conference_Titel :
Plasma Science - Abstracts, 2009. ICOPS 2009. IEEE International Conference on
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2617-1
DOI :
10.1109/PLASMA.2009.5227759