本文叙述了按Kino方法设计的一种“M”型长枪所进行的实验。这种枪产生预定的电流值,但电子注的其他特性与理论结果并不符合。通过实验,可作出结论:电子注中存在射频不稳定性。此种不稳定性乃是在阴极处产生,并在漂移区内增长的。增长速率与MacFarlane和Hay的理论所给出的射频场增长速率有相同数量级。 This article describes an experiment performed on a “M” type rifle designed by the Kino method. This gun produces a predetermined current value, but other characteristics of the electron injection do not match the theoretical results. Through experiments, we can conclude that there is radio frequency instability in the electron injection. This instability is generated at the cathode and grows in the drift region. The rate of increase is about the same order of magnitude as the rate of increase of the radio frequency fields given by MacFarlane and Hay's theory.