摘要
The program about the C-band linac for high energy density physics needs a high current photocathode electrongun with very short pulse which is designed in IMP. The quantity of the electric charge is 1nC per pulse, and thepulse width is several ps. The cavity about the gun is formed by a whole cell cavity and a 0.6 cell cavity. The RFcharacteristic about the 1.6 cell cavity of the electron gun is simulated with Superfish[1] and Parmela.Fig. 1 shows the equivalent circuit diagram of the 1.6 cell C-band photocathode electron gun. In this figure, L1,C1 are the capacitor and inductor about the 0.6 cell cavity, and L2, C2 are the capacitor and inductor about the 1cell cavity. The natural frequency of the 0.6 cell cavity is f1, and the natural frequency of the 1 cell cavity is f2.
