研究目的
Investigating the design of polarizers with smooth grooves for the electron cyclotron heating and current drive system using the coordinate transformation method.
研究成果
The coordinate transformation method combined with Fourier expansion is effective for designing smooth-grooved polarizers for ECH&CD systems. Experimental results show good agreement with numerical predictions, validating the method. It offers a simpler alternative to other complex design methods and can be used for practical applications in fusion engineering.
研究不足
The method may have limitations in handling very complex groove shapes or extremely high frequencies beyond the tested range. Manufacturing and measurement errors, such as deviations in inclination angle for trapezoidal grooves, can affect accuracy. The truncation of Fourier series might introduce small errors in numerical calculations.
1：Experimental Design and Method Selection:
The study employs the coordinate transformation method (C-method) for designing polarizers, involving coordinate transformation to simplify boundary conditions and Fourier expansion for numerical calculations. A code is developed based on this method to design polarizers with smooth grooves.
2：Sample Selection and Data Sources:
Four polarizers are designed and tested: two with sinusoidal grooves and two with trapezoidal grooves. Parameters such as groove depth and period are specified based on design requirements at 105 GHz frequency.
3：List of Experimental Equipment and Materials:
A low power test platform is used, including a microwave signal generator, multiplier, horn antenna, rotatable platform for the polarizer, diode detector, power meter for calibration, and spectrum analyzer for frequency check. The polarizers are manufactured with specific groove shapes.
4：Experimental Procedures and Operational Workflow:
The polarizers are manufactured and their parameters measured. The test involves generating a 105 GHz wave, reflecting it off the polarizer, and measuring the polarization characteristics by rotating the polarizer from 0° to 180°. Data is processed to obtain rotation and ellipticity angles of the reflected wave.
5：0°. Data is processed to obtain rotation and ellipticity angles of the reflected wave.
Data Analysis Methods:
5. Data Analysis Methods: The polarization parameters (alpha and beta angles) are analyzed and compared with numerical results from the developed code. Calibration is done to reduce measurement errors.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
