Experimental investigation of X-band long pulse high-power microwave generation

Obtaining long-pulse high power microwave(HPM) is one of the most important aims for HPM sources technology. In the paper, difficulties in generating long pulse HPM for sources using slow-wave structures are discussed from the view point of physical mechanism, and some suggestions are given. By using of a long pulse pulsed power driver and an overmoded slow-wave structure HPM source, X-band long pulse HPM generating experiments were carried out. In the experiments, a kind of dielectric-copper cathode was adopted and the slow-wave structures of the HPM device were coated with Cr film. Under the condition of guiding magnetic field of 0.7 T, diode voltage of 400 kV，beam current of 10 kA with duration of 200 ns, an X-band long pulse HPM was obtained with power of 500 MW, duration of 100 ns an