Analysis of indefinite divertor footprint with proper orthogonal decomposition in hydrogen/deuterium plasmas in LHD

Tanaka, Hirohiko; Masuzaki, S.; Kawamura, G.; Kobayashi, M.; Suzuki, Y.; Morisaki, T.; Ohno, Noriyasu

doi:10.1016/j.nme.2019.03.014

Cited by 1 publication

(1 citation statement)

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“…In recent studies, we have applied the proper orthogonal decomposition (POD) method, which is also called the principal component analysis (PCA) and one of the multivariable analysis techniques, to the ion-saturationcurrent dataset obtained by using a large number of Langmuir probes embedded on the LHD divertor plates (called "toroidal divertor probe arrays") [9,10]. As a result, a characterization index of the divertor particle flux distribution (r 2/1 ) was evaluated from the ratio of two dominant orthogonal bases in the POD analysis outputs.…”

Section: Introductionmentioning

confidence: 99%

Correlation of the Orthogonal Basis of the Core Plasma Distribution to the Divertor Footprint Distribution in LHD

Tanaka

Masuzaki

Kawamura

et al. 2023

Plasma and Fusion Research

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We have applied the multivariable analysis technique called the proper orthogonal decomposition (POD) to both the divertor particle flux distribution and the electron pressure distribution in the core region of LHD. The cross-correlation analysis indicates that 3rd, 4th, and 5th POD modes of the electron pressure distribution are highly correlated with the divertor footprint index which is a measure of where the peak position of the particle flux distribution is located on the inner divertor plate. Both the 3rd and 4th modes seem to correspond to the shift of the electron pressure peak position from the magnetic-axis radius. In contrast, 5th mode has a strong influence on the peripheral gradient of the electron pressure distribution. Their relationships with the divertor footprint could be explained by the finite β and the Pfirsch-Schlüter current effects.

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Section: Introductionmentioning

confidence: 99%