Alias Sampling Effect on the Calculation of MHD Mode Number in Fusion Plasma
Nan Chu
TL;DR
This paper derives a formula for alias frequency and investigates how alias sampling affects the calculation of MHD mode numbers in fusion plasma, revealing that the true mode structure remains unchanged despite aliasing.
Contribution
It introduces a detailed alias frequency formula and shows that MHD mode structure is unaffected by alias sampling, aiding high-frequency mode analysis with low-frequency diagnostics.
Findings
The absolute MHD mode number remains unchanged under alias sampling.
Alias frequency formula for MHD modes is derived.
High-frequency MHD modes can be characterized even when Nyquist theorem fails.
Abstract
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of the high frequency MHD mode with low frequency sampled diagnostics even when the Nyquist-Shannon sampling theorem is no longer valid.
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Taxonomy
TopicsAnomaly Detection Techniques and Applications · Magnetic confinement fusion research · Time Series Analysis and Forecasting