Analysis of Quadrupole Focusing Lattices for Electron Beam Transport in Traveling-Wave Tubes

Author

Nichols, K. ; Carlsten, Bruce ; Schamiloglu, Edl

Author_Institution

Electr. & Comput. Eng. Dept., Univ. of New Mexico, Albuquerque, NM, USA

Volume

61

Issue

6

fYear

2014

fDate

Jun-14

Firstpage

1865

Lastpage

1870

Abstract

Analysis of quadrupole focusing lattices for high-frequency traveling-wave tubes is presented. This paper is motivated by recent work performed at the Naval Research Laboratory which demonstrated an advantageous case for strong focusing employing a Halbach quadrupole lattice. Using realistic permanent magnet quadrupole (PMQ) field cancellation, the advantage of using PMQ to transport higher current densities than a permanent periodic magnet disappears, while other advantages for employing quadrupole focusing remain.

Keywords

current density; electron beam focusing; permanent magnets; travelling wave tubes; Halbach quadrupole lattice; electron beam transport; permanent magnet quadrupole field cancellation; quadrupole focusing lattices; traveling wave tubes; Current density; Electron beams; Focusing; Lattices; Lenses; Magnetic analysis; Beam transport; periodic permanent magnet; quadrupole strong focusing; traveling-wave tube (TWT); traveling-wave tube (TWT).;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2014.2299432

Filename

6784006