CERN Accelerating science

Article
Title	34.272 GHz Multilayered Dielectric-Loaded Accelerating Structure
Author(s)	Jing, Chunguang ; Gai, Wei ; Kanareykin, Alex ; Liu Wan Ming ; Power, John G
Affiliation	(ANL, Argonne, Illinois) ; (Euclid Concepts, LLC, Solon, Ohio)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.1592
Subject category	Accelerators and Storage Rings
Abstract	A scheme of multilayered structure design of 34.272 GHz with alternating dielectric of 38 and 9.7 is presented. The multilayer structure employs the Bragg Fiber concepts where the dielectric layers are used to create multiple reflections in order to confine the accelerating fields, thus greatly reducing the power loss of from external metal wall. The structure will operate at TM03 mode instead of normal TM01 mode. Numerical examples for the 2- and 4-layers 34.272 GHz multilayered structures are presented with detailed analysis of TM (acceleration) modes and HEM (parasitic) modes. We found that the power attenuation of the proposed structure can be lowered from   20 dB/m for a single layer structure to   6 dB/m for 2 -4 layered structure in at 34.272 GHz. We will also present a coupler design for the multilayered dielectric-loaded accelerating structure, which has capability of mode selection and high efficient RF transmission.