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三端环形器装在MEVATRON—12型医用加速器微波传输系统中。它的作用是让磁控管输出的微波功率全部传向加速导管,以加速电子达到足够的能量。同时把加速波导管反射回来的剩余微波功率传向水负载,不让反射功率回到磁控管,避免反射功率损害磁控管。当三端环形器损坏时,就失去了上述单向传输控制作用。加速波导管中被加速电子得不到足够的微波能量。因而加速器不出射线。故障现象加速器在治疗运行中突然出现削波(Clip)联锁讯号,同时可听到加速器发出噪声——微波传输波导中三端环形器打火的声音。用示波器监视磁控管电流波形,因出现联锁的时间很
The three-end circulator is installed in the MEVATRON-12 medical accelerator microwave transmission system. Its role is to let the microwave power output by the magnetron be transmitted to the acceleration catheter to accelerate the electrons to reach sufficient energy. At the same time, the remaining microwave power reflected by the accelerating waveguide is transmitted to the water load, so that the reflected power is not returned to the magnetron and the reflected power is prevented from damaging the magnetron. When the three-end circulator is damaged, the above-described unidirectional transmission control effect is lost. Accelerated electrons in the waveguide do not receive enough microwave energy. Therefore, the accelerator does not emit rays. Symptom Accelerator suddenly shows a clip interlock signal during the treatment run, and at the same time it can hear noise from the accelerator—the sound of a three-terminal circulator in the microwave transmission waveguide. Using an oscilloscope to monitor the magnetron current waveform, due to the interlocking time