Title :
PBG cavities for single-beam and multi-beam electron devices
Author :
Smirnov, Alexander ; Newsham, D. ; Yu, D.
Author_Institution :
DULY Res. Inc., Rancho Palos Verdes, CA, USA
Abstract :
PBG cavity having one or six defects is studied in the frequency domain. External Q-factors are found numerically for different portal configurations. A new type of hybrid HOMs with coupled monopole and multipole field patterns is found. A novel radial transmission line method is introduced to evaluate the external Q-factor of modes with quasi-absorbing external boundary. A flat-field, rectangular cavity loaded with linear arrays of rods and defects is designed and compared with the planar barbell cavity. Loss-factor and modal spectra are compared with conventional cavities for both circular and planar PBG cavities.
Keywords :
accelerator cavities; electron accelerators; electron beams; photonic band gap; transmission line theory; PBG cavities; defect-loaded cavity; external Q-factors; flat-field rectangular cavity; frequency domain; hybrid HOM; loss-factor spectrum; modal spectrum; monopole field pattern; multibeam electron device; multipole field pattern; photonic band gap; planar barbell cavity; portal configurations; quasiabsorbing external boundary; radial transmission line method; rod-loaded cavity; single-beam electron device; Couplings; Electron devices; Frequency domain analysis; Lattices; Optical losses; Periodic structures; Photonic band gap; Planar transmission lines; Portals; Q factor;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289636
