L-band hard-tube magnetically insulated line oscillator

According to the requirement of hard-tube magnetically insulated line oscillator(MILO), the diode of MILO is investigated. It has an insulator made of porcelain with ring slot and its shelter is improved. The length of the diode is shortened. With the improved diode, the device of MILO is optimized. In order to condense the apparatus, the integrity of the radiation antenna and microwave mode converter is also optimized. The experimental results are given: employing an electron beam of about 450 kV and 35 kA, L-band hard-tube MILO generates over 1.5 GW high power microwave with over 20 ns pulse duration at 1.22 GHz, the power efficiency is about 10%.