Hybrid dielectric and iris-loaded periodic accelerating structure

Citation
P. Zou et al., Hybrid dielectric and iris-loaded periodic accelerating structure, J APPL PHYS, 90(4), 2001, pp. 2017-2023
Citations number
14
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF APPLIED PHYSICS
ISSN journal
00218979 → ACNP
Volume
90
Issue
4
Year of publication
2001
Pages
2017 - 2023
Database
ISI
SICI code
0021-8979(20010815)90:4<2017:HDAIPA>2.0.ZU;2-B
Abstract
One disadvantage of conventional iris-loaded accelerating structures is the high ratio of the peak surface electric field to the peak axial electric f ield useful for accelerating a beam. Typically this ratio E-s/E(a)greater t han or equal to2. The high surface electric field relative to the accelerat ing gradient may prove to be a limitation for realizing technologies for ve ry high gradient accelerators. In this article, we present a scheme that us es a hybrid dielectric and iris-loaded periodic structure to reduce E-s/E-a to near unity, while the shunt impedance per unit length r and the quality factor Q compare favorably with conventional metallic structures. The anal ysis based on MAFIA simulations of such structures shows that we can lower the peak surface electric field close to the accelerating gradient while ma intaining high acceleration efficiency as measured by r/Q. Numerical exampl es of X-band hybrid accelerating structures are given. (C) 2001 American In stitute of Physics.