(9) 



U— - 



—-J 



(b) 



TIME, t 



(C) 



Ce) 



Fig. 3- — Power pulser. 



(a) Simplified circuit diagram showing charging tube at left, bias supply Eo, plate 

 power supply Eb, linear coil Li, non-linear coil L2, output condenser C2, and load resistor R2. 



(b) Rectangular wave of grid voltage impressed upon the tetrode of Fig. 3a. The tube 

 conducts during the time t in each cycle, and is cut off outside that interval. 



(c) Plate current wave (h) corresponding to time scale of (b). During interval /, 

 current is drawn through the paralleled inductors and the charging tube. At the end of 

 this interval the tul)e is cut off and remains so until the start of the next cycle. During 

 II, the magnetically stored energy is transferred to the condenser through K2- At the 

 same time the non-linear coil is brought toward saturation. During III saturation is 

 reached; energy stored in C2 is transferred to the load resistor through L2 in a short pulse. 



(d) B-H loop of non-linear coil used in the circuit of (a). Letters mark the most 

 important transitions. During interval I magnetization proceeds from the lower left 

 through a up to h; during II magnetization decreases past c down to d, and during III 

 it extends far Ijeyond the limits of the Figure to the left, returning to the neighborhood 

 of d upon completion of the output pulse. 



(e) Plot of current in linear coil during charging interval I against the product of coil 

 voltage and time. Enclosed area represents energy stored in the linear coil. The rec- 

 tangular area under the dashed line drawn through ?o represents that part of the stored 

 energy which varies with bias current. 



608 



