Contents I. Introduction
With the development of HPM technology applied in many areas such as particle accelerator, plasma heating and radar [1]–[2], the requirement of HPM measurement becomes more and more strict. However, due to the characteristics of high peak power, short pulse width, single pulse and low repeating frequency of HPM, it is unlikely feasible to directly measure its peak power. One of the widely used methods is to measure the attenuated power, which requires a previously calibrated attenuator for calculation of the power. In most cases, the attenuator calibration is typically operated under the condition of low power and continuous wave [3]–[4], which is quite different from the practical conditions of single pulse, high power signal. At present, the injection power of the attenuation in HPM measurement can be up to tens of kilowatts, and the preliminary experimental results show that the attenuation varies a lot [5], which increases the uncertainty in measurements and severely limits the applicability of attenuator used in the HPM measurement.
