谐振环是一种利用较小的储能产生高射频峰值功率的行波腔 .本文描述了谐振环的基本原理 ,介绍了在S 波段直线对撞机 (SBLC)中的高功率谐振环的结构、性能、调谐程序、测量方法及结果 .目前谐振环已经成功地运行 ,其功率增益为 1 0dB ,峰值功率为 2 0 0MW .本文还对速调管窗的初步高功率试验进行了讨论 . Resonant ring is a kind of traveling wave cavity that generates high RF peak power with smaller energy storage. This paper describes the basic principle of resonant ring and introduces the structure of high power resonant ring in S-band linear collider (SBLC) , Performance, tuning procedures, measurement methods and results.At present, the resonant ring has been successfully operated with a power gain of 10dB and a peak power of 200MW.This paper also discusses the preliminary high power test of the klystron.