The application of the 3dB directional coupler is very extensive,such as the phase shifter,the attenuator and the RF pulse compressor etc.The performance of the 3dB directional coupler is very important for these comp...The application of the 3dB directional coupler is very extensive,such as the phase shifter,the attenuator and the RF pulse compressor etc.The performance of the 3dB directional coupler is very important for these components. Optimization design has been done using the HFSS code.The new phase shifter prototype using the new optimization results has been tested.The tested results are in agreement with the measured ones.展开更多
The transient response analysis of the SLED based on the equivalent circuit is described. Then, a C-band SLED using TE0,1,15 mode cylindrical cavity with TE10-TE01 mode converter has been designed. According to the ma...The transient response analysis of the SLED based on the equivalent circuit is described. Then, a C-band SLED using TE0,1,15 mode cylindrical cavity with TE10-TE01 mode converter has been designed. According to the main RF parameters of the accelerator, the coupling coefficient is optimized to obtain the maximum multiplication factor. The key components of the pulse compressor include a 3 dB directional coupler, a TE10-TE01 mode converter, and a cylindrical cavity, which are simulated and optimized using 3D electromagnetic field simulation software. In addition, the function defining the relation between the coupling factor and aperture size is derived by a mathematical fitting method.展开更多
The pulse compressor plays an important role in accelerators by enhancing the RF peak power.An S-band(2856 MHz)spherical cavity pulse compressor consisting of a special 3 dB coupler and a single spherical energy stora...The pulse compressor plays an important role in accelerators by enhancing the RF peak power.An S-band(2856 MHz)spherical cavity pulse compressor consisting of a special 3 dB coupler and a single spherical energy storage cavity has been developed in Institute of High Energy Physics.The special 3 dB coupler converts the TE10 mode in rectangular waveguide to two polarization degenerated TE11 modes in cylindrical waveguide.It is also a circular polarizer and its general scattering matrix is given for the first time.The magnitude and the phase difference of the two TE11 modes are−3.016,−3.005 dB and 90.02◦in HFSS,while it is−3.01,−3.01 dB and 89.79◦in CST.The simulated S parameters show agreement with the general scattering matrix.The TE114 mode with an unloaded Q factor of 190,000 has been chosen to resonate in the spherical cavity.An energy multiplication factor of 1.75 and a peak power gain of 5.75 were obtained for the whole pulse compressor,which agrees with the design requirements.A good pulse compression performance is also proved by the CST time-domain simulation.In addition,the scheme for tuning and detuning is designed and given in detail.Compared to the traditional SLED type,the spherical cavity pulse compressor uses only one spherical cavity to realize the pulse compression,which makes it compact as a whole.展开更多
文摘The application of the 3dB directional coupler is very extensive,such as the phase shifter,the attenuator and the RF pulse compressor etc.The performance of the 3dB directional coupler is very important for these components. Optimization design has been done using the HFSS code.The new phase shifter prototype using the new optimization results has been tested.The tested results are in agreement with the measured ones.
文摘The transient response analysis of the SLED based on the equivalent circuit is described. Then, a C-band SLED using TE0,1,15 mode cylindrical cavity with TE10-TE01 mode converter has been designed. According to the main RF parameters of the accelerator, the coupling coefficient is optimized to obtain the maximum multiplication factor. The key components of the pulse compressor include a 3 dB directional coupler, a TE10-TE01 mode converter, and a cylindrical cavity, which are simulated and optimized using 3D electromagnetic field simulation software. In addition, the function defining the relation between the coupling factor and aperture size is derived by a mathematical fitting method.
基金Supported by the Youth Found of National Natural Science Foundation of China (11505199).
文摘The pulse compressor plays an important role in accelerators by enhancing the RF peak power.An S-band(2856 MHz)spherical cavity pulse compressor consisting of a special 3 dB coupler and a single spherical energy storage cavity has been developed in Institute of High Energy Physics.The special 3 dB coupler converts the TE10 mode in rectangular waveguide to two polarization degenerated TE11 modes in cylindrical waveguide.It is also a circular polarizer and its general scattering matrix is given for the first time.The magnitude and the phase difference of the two TE11 modes are−3.016,−3.005 dB and 90.02◦in HFSS,while it is−3.01,−3.01 dB and 89.79◦in CST.The simulated S parameters show agreement with the general scattering matrix.The TE114 mode with an unloaded Q factor of 190,000 has been chosen to resonate in the spherical cavity.An energy multiplication factor of 1.75 and a peak power gain of 5.75 were obtained for the whole pulse compressor,which agrees with the design requirements.A good pulse compression performance is also proved by the CST time-domain simulation.In addition,the scheme for tuning and detuning is designed and given in detail.Compared to the traditional SLED type,the spherical cavity pulse compressor uses only one spherical cavity to realize the pulse compression,which makes it compact as a whole.
