Author: Toyokawa, H.
Paper Title Page
Toward High Power Efficiency and High Gradient Dielectric Assist Accelerating Structures  
  • D. Satoh, R. Kuroda, H. Toyokawa
    AIST, Tsukuba, Ibaraki, Japan
  • S. Mori, M. Yoshida
    KEK, Ibaraki, Japan
  A dielectric assist accelerating (DAA) structure, a type of dielectric loaded accelerating structures, is greatly superior in power efficiency compared with the conventional disk-loaded copper structures. The advantage of DAA structure is that it has an extremely high quality (Q0 > 105) factor and a high shunt impedance (Zsh > 600 MOhm/m) at room temperature since the electromagnetic field distribution of the accelerating mode can be controlled by the geometry of its structure to reduce the wall loss on metallic surface. However, in a prototype of a DAA structure, multipactor discharge occurred between the ceramic cells, and high gradient operation has not been achieved. In order to solve this issue while maintaining the high-power efficiency of DAA structure, we have been studying ceramic materials and the surface coating so as to reduce the secondary electron emission coefficient. The structural optimization of the DAA structure for high gradient operation is examined by the cavity simulations. In this conference, the latest results of the simulation study and the experiments of DAA structure are reported.  
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