Pulsed power supply for magnetic field to generate HPM from slow wave structures

A strong axial magnetic field is required to guide a relativistic pulsed electron beam. The magnetic field can be supplied either by a permanent magnet or an electromagnet. In a backward wave oscillator (BWO) experiment, as the required field is 0-1.2 T in a cylindrical volume having radius of a couple of centimeters and length of about 10-12 cm, an electromagnet is preferred. A large pulsed current is passed into a solenoid to generate a pulsed magnetic field. This current is provided by a capacitor bank. In the paper, development of a pulsed magnetic field system is described. The generated magnetic field is of strength 1.25T with the pulse duration of 2 ms. Inner diameter of solenoid is 5 cm and length is 12 cm. The magnetic field guides a relativistic electron beam that excites a slow wave structure to generate high power microwaves.In conclusion, a pulsed power supply of magnetic field generation is fabricated. We have used a spark gap as a switch. Magnetic field can be varied upto 1.25 T. The magnetic field is used to guide a pulsed electron beam of 150 ns. High power microwaves are generated using three different type of slow wave structures. Microwave pulses of50 ns are obtained.