Sai Dong

Measurement for the kanthal alloy used for collinear load and the s-band load design

We have developed the method to determine the permeability and the electrical conductivity of the Kanthal alloy available. The alloy is coated inside the 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 permeability and the calculated value of the conductivity, the computation study of the collinear load has been made by Microwave Studio. The attenuation in the collinear load is 16.02 dB.

Investigations of photonic band gap microwave-driven accelerating cavity

We report the calculation and cold test results for an 11.424 GHz photonic band gap (PBG) cell, which can be utilized as an accelerating cavity. Cold test results are compared with the theoretical design of the resonator. The S parameters and the field pattern were simulated for the PBG-based cavity by putting the six SiC rods, which are used as the microwave absorber, at the outer circle of the cavity instead of the six copper rods. The simulation results show that the higher-order-modes may be efficiently suppressed.

Model cavity investigations and calculations on hom for an x-band hybrid dielectric-iris-loaded accelerating structure

Some model cavities have been further developed and investigated for an X-band (f=9.37 GHz) hybrid dielectric-iris-loaded accelerating structure based on the calculated results about the effect of the dimension tolerance on the frequency. 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 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.

The Studies of X-Band Hybrid Dielectric-Iris-Loaded Accelerating Structure

The dispersion property and the propagation characteristic of the accelerating mode (TM01mode) about a X-band (f=9.37GHz) hybrid dielectric-iris-loaded accelerating structure has been analysed and discussed by the field matching method and Mafia code respectively. The ones of the HEM11mode have also been calculated by MAFIA code. Based on the experimental results of the used dielectric (ceramic). Mafia code has been used to make the optimization design for the new structure. Some model cavities have been developed and measured. The experimental investigations show that the results are nearly agreement with the theory design.

A low cost and high efficient facility for removal of SO/sub 2/ and NO/sub x/ in the flue gas from coal fire power plant

The emission of toxic gas, sulfur oxides and nitrogen oxides has become serious issue in the world. A review of EB method to remove the SO/sub x/ and NO/sub x/ in flue gas from coal-fired power plants was described in this paper. A design of an electron curtain accelerator of 600 keV was given, and a facility for purification of flue gas from coal combustion power plant of 10 MW was described here.

Coupler design and test for X-band hybrid loaded circular waveguide accelerator

The coupler for X-band hybrid dielectric-metal disk-loaded circular waveguide accelerator was designed and tested. The S parameters versus the coupler cavity radius b, the iris aperture w and its thickness h have been simulated by Microwave Studioreg. The optimized reflection coefficient Sn being 0.01 was got at 9.372 GHz. The experiment result of the standing-wave ratio SWR of the coupling cavity being 1.03 was obtained at 9.372 GHz. The simulated results are accorded with the tested results.

Simulation on S-band alternating periodic structure

Simulations of the RF characteristic (dispersion curves, operating frequency, and electric field distributions) of the alternating periodic structure (APS) are given. The dispersion relations of APS are compared with the uniformly periodic structure (UPS). The above results are accorded with the tested results of the Toshiba Research and Development Center. The simulations make the tuning process of the APS very easy.

Coupler design for x-band hybrid dielectric-iris-loaded accelerator

The coupler design for X-band hybrid dielectric-iris- loaded accelerator has been studied. Firstly, the S parameter versus the coupler cavity radius b, the iris aperture w and its thickness h has been simulated by Microwave Studio for the ordinary coupling cavity due to its simplicity. We have obtained the primary experiment result of the standing-wave ratio of the coupling cavity being 1.82. Secondly, the new coupler with the dual symmetric coupling ports , 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 dielectric accelerator section, has been calculated. The simulated results show that it is capable to convert the rectangular TE10 mode into circular TM01 mode with high efficiency.

The Simulation Calculations and Dielectric Characteristics Investigation of an X-Band Hybrid Dielectric-Iris-Loaded Traveling Accelerating Structure

Mafia code has been used to calculate the RF properties versus the geometric parameters and dielectric permittivity for the X-band (f=9.37GHz) hybrid dielectric-iris-loaded traveling accelerating structure. The simulation results show that when the range of the permittivity is about 5-9, the new structure may have lower ratio of peak surface electric field at the iris to axial accelerating electric field by optimizing the geometric parameters, while r/Q of the new structure being comparable to iris-loaded accelerating structure and r, Q being a little lower. The experimental investigations of the permittivity for selection about the dielectric (ceramics) have been made at the X-band by using the cavity perturbation technique. The measured results are consistent with the simulation results by Microwave Studio. Furthermore, the permittivity stability of the certain ceramic with varying frequency is examined. The experimental results show that the certain ceramic with permittivity of 5.81 is applied to the design of the new accelerating structure.