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He, X. D.

Paper Title Page
WEPMN048 Measurement for the Kanthal Alloy Used for Collinear Load and S-band Load Design 2146
  • X. D. He, S. Dong, Y. J. Pei, C.-F. Wu
    USTC/NSRL, Hefei, Anhui
  Funding: National Nature Science Foundation No.10675116 No.10375060

We have developed the mathod to determine the permittivity and permeability of Kanthal alloy available. The alloy is coated on the inside walls of disk-loaded cavities,which is used for the collinear load. The collinear load absorbs the remaining rf-power over the last cells of the section while still accelerating the beam. Based on the experimental results of the permittivity and permeability,the computation study of the constant power-loss collinear load has been made by Microwave Studio. The design data about the S-band collinear load are present.

WEPMN050 Model Cavity Investigations and Calculations on HOM for a X-Band Hybrid Dielectric-Iris-Loaded Accelerating Structure 2149
  • C.-F. Wu, S. Dong, X. D. He, H. Lin, L. Wang
    USTC/NSRL, Hefei, Anhui
  Funding: National Nature Science Foundation of China, Grant No.10375060 and No.10675116

Some model cavities have been further developed and investigated for a X-band (f=9.37GHz) hybrid dielectric-iris-loaded accelerating structure based on the calculated results about the effect of the dimension tolerance on the RF properties. The dispersion curve fitted by using the measurement value is consistent with the one calculated. The r/Q values of the dipole modes have been calculated by the Mafia code. The theoretical results show that the r/Q values of dipole modes for the new accelerating structure are lower than those for the iris-load accelerating structure.

WEPMN051 Coupler Design for X-Band Hybrid Dielectric-Iris-Loaded Accelerator 2152
  • C.-F. Wu, S. Dong, X. D. He, H. Lin
    USTC/NSRL, Hefei, Anhui
  Funding: National Nature Science Foundation of China, Grant No.10375060 and No.10675116

The coupler design for X-band hybrid dielectric-iris-loaded accelerator has been studied. Firstly, the S parameters versus the coupler cavity radius, the width and the height of the coupling hole have been simulated by Microwave Studio for the ordinary coupling cavity. We have obtained the primary measurement result of the standing-wave ratio of the coupling cavities being 1.8275. Secondly, the new couplers, which first converts RF from TE to TM mode in a pure metal section and then a tapered transition section is added for high efficiency transmission to the accelerator section, have been calculated for both single and dual coupling ports. The simulated results show that both types are capable to convert the TE 10 mode into TM 01 mode with high efficiency over a relatively wide bandwidth.