前几年,在加利福尼亚大学进行大功率冷阴极磁控管研制过程中(主要由D. H. Sloan及其同事)曾反复出现一个令人注视的结果。人们观察到;在结构形状、阴极材料(二次发射系数)和尺寸完全不同的情况下,若在一个迥旋频率周期内电子行进的距离相当于阴极-阳极间距,那么,起振所需之功率为最小。这种在一般磁控管中早就观察到的现象在此是在无互作用结构下(“光筒”磁控管)观察到。以前早就由(?)和另一些学者暗示过,迴旋波长对阴阳极间距之比在正交场器件中起着重大作用,并当同光壁(或线路)的互作用为最小 A few years ago, one of the most dramatic results in the development of high-power cold cathode magnetrons at the University of California (mainly by D. H. Sloan and colleagues) has been repeated. It has been observed that if the distance traveled by the electrons in a cyclic frequency corresponds to the cathodic-anodic spacing with a completely different shape of the structure, the cathode material (secondary emission coefficient) and the size of the cathode, Power is minimum. This phenomenon, which has long been observed in typical magnetrons, is observed here under the non-interacting structure (“light tube” magnetron). It has been previously suggested by (?) And others that the ratio of gyro wavelength to cathode-anode spacing plays a major role in orthogonally-fielding devices and minimizes the interaction with the optical wall (or circuit)