Alias Sampling Effect on the Calculation of MHD Mode Number in Fusion Plasma
Nan Chu · arXiv (Cornell University) · 2019
Detailed alias frequency formula and the effect of alias sampling on the calculation of MHD mode number are derived. It is discovered that the absolute MHD mode number/structure does not change under alias sampling. This discovery can help us to determine the structure of the high frequency MHD mode with low frequency sampled diagnostics even when the Nyquist-Shannon sampling theorem is no longer valid.