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      Alias Sampling Effect on the Calculation of MHD Mode Number in Fusion Plasma

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          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of the high frequency MHD mode with low frequency sampled diagnostics even when the Nyquist-Shannon sampling theorem is no longer valid.

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          Most cited references 3

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          Communication in the Presence of Noise

           C.E. Shannon (1949)
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            Short term spectral analysis, synthesis, and modification by discrete Fourier transform

             J J Allen (1977)
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              A high resolution Mirnov array for the Mega Ampere Spherical Tokamak

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                Author and article information

                Journal
                21 October 2019
                Article
                1910.09181

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                Custom metadata
                5 pages, 6 figures
                physics.plasm-ph

                Plasma physics

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