Study on Unsymmetrical Collector for Traveling Wave Tube

Nowadays traveling wave tube(TWT)development are towards miniaturization,high power and high frequency.The unsymmetrical collector structure optimization on one-dimensional or multidimensional is an important route for miniaturization.Ellipse collector has larger inner area and smaller one-dimensional size than traditional circular ones.According to the effect of quasi-quadrupole lens,when electron beam pass through the entrance of the collector,the shape of circular cylindrical electron beam become quasi-ellipse,which is better for being collected.The re-designed collector is simulated using CAD software,and the result could guide the practical design of unsymmetrical collector.