A 600 kV, 150 ns Rise-Time Pulse Transformer for Klystron Pulse Modulator

Summary form only given: A 600 kV, 150 ns rise-time pulse transformer with a 1:15 step-up ratio has been developed for klystron pulse modulators. This pulse transformer has been designed to produce pulses with a peak current of 1200 A, a peak voltage of 600 kV, a rise-time of 150 ns, a flat-top width of 400 ns, and a repetition rate of 50 pps. To realize a fast rise-time, the pulse transformer with a low stray capacitance and leakage inductance should be designed. One-turn primary winding as well as a bililer and tapered secondary winding design was adapted to minimize the leakage inductance. Additionally, amorphous alloy toroidal cores with a high magnetic flux swing and a high permeability were used to improve the pulse droop and core losses. The transmission characteristics and pulse time-response were measured to analyze the pulse transformer performance. The data were compared with a simplified lumped constant circuit model. The agreement with the model was very good. The results of high voltage tests using a dummy load are also presented.