Frequency domain signal processing with axial B-dot beam angle monitor

A new method with frequency domain processing was used in processing the output signals of axial B-dot beam angle monitor. By this method, the valuable signals were derived from the signals in frequency domain with other disturbing signals eliminated and with a certain amount that were related with beam position. This method is a good complement to that with time domain processing and more suitable for modeling of actual complex axial B-dot circuit, but the measurement errors caused by the alignment error could not be reduced while the displacements of beam are large. The measurement error of frequency domain processing was approximate to that of time domain processing with value of 1 mrad according to the measurement using a test stand.