Numerical analysis on high frequency characteristics of MILO

Through numerical calculation, the high frequency characteristics of magnetically insulated line oscillator （MILO） coaxial slow wave structure(SWS)，the frequency of the eigen-modes and its distribution of coaxial SWS are presented. The sizes of MILO are:the inner radius of the primary SWS and RF choke 4.6 cm and 4.2 cm,respectively, the cathode radius 3 cm. When the frequency in MILO is from 3.6 to 4.4 GHz, the RF chock cavity stops leakage of microwaves toward the pulse power, unexpectedly increases the output power. The cutoff frequency of the primary SWS is from 4.5 to 4.9 GHz. A wave whose frequency is near cutoff is evanescent in the primary SWS. The eigen-frequency of MILO with open boundary was calculated and the Q-value in the cavity was given by the experimental results. The fr