Effect of Resonator Parameters on Frequency and Quality Factor of Gyrotron Resonators

The influence of some cavity parameters on the resonance frequency and quality factor is investigated with the aim of comparing various methods of optimization. As an example, the geometry of the designed resonator for an experiment on a multifrequency gyrotron that would operate at 140 GHz in the TE_22,8 mode is considered. This is a weakly–tapered conventional cavity resonator with parabolic–roundings. The influence of the roundings on the quality factor is at least as important as that of the cavity length and the output taper angle.     

LOW POWER MEASUREMENTS ON THE NEW RF OUTPUT SYSTEM OF A 170 GHZ, 2 MW COAXIAL CAVITY GYROTRON

The design of the quasi optical (q. o.) RF output system for the first industrial prototype of the European 170 GHz, 2 MW, CW coaxial cavity gyrotron for electron cyclotron heating and current drive in ITER has been verified at a low power level. Results of measurements with a high quality TE_34,19-mode generator are in good agreement with the design calculations. This strengthens the confidence both to the employed design codes and to the manufacturing quality of the launcher and mirrors.     

ECRCVD技术淀积太阳电池的减反膜

本文报道了用电子回旋共振化学气相淀积(ECRCVD)技术实现了低温(50℃)淀积SiON/SiN膜作硅太阳电池减反射膜的实验研究.探讨了影响薄膜性能的主要工艺参数,设计了具有较佳抗反效果的双层减反膜,并对膜层的反射率和太阳电池参数进行了测定.结果表明:该减反膜具有良好的减反效果,能实现较宽波段范围内的均匀增透,使太阳电池短路电流密度提高了42%,电池转换效率提高了45%.