Modeling of soft N, M and L X-ray lines from tungsten relevant to plasma parameters in the WEST tokamak

Syrocki, Ł.; Słabkowska, K.; Węder, E.; Starosta-Sztuczka, J.; Polasik, M.

doi:10.1016/j.nimb.2017.05.054

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…In the case of changes in plasma evolution it has been shown that with Bayesian learning and maximum of fuzzy entropy can be reached all probabilistic distributions, including non-Gibbsians distributions [24,25]. As reference papers concerning the diagnostic of high-temperature plasma conditions in tokamak reactors under the effect of plasmawall interaction see [26][27][28][29].…”

Section: Resultsmentioning

confidence: 99%

Investigation of Stabilities and Instabilities at Tokamak Plasma Behavior and Machine Learning with Big Data

Rastovic¹

2017

IJMTP

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We investigate the problem of stability and instability at tokamak plasma behavior. Generally, Jaynes maximum entropy method and Bayesian decision can be applied for recognizing the shape of the plasma.In the case of the power law behavior and the instabilities of plasma we introduce a new method. The maximization of mathematical expectations for events and fuzzy entropy is used for applications of fuzzy Bayesian neural networks for optimization and simulation without assumption on recurrence. In this case, it is possible to consider also the non-Gibbsian probability distribution functions with the power law case. The new calibration method for the non-equilibrium systems has been given.

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Section: Resultsmentioning

confidence: 99%

Investigation of Stabilities and Instabilities at Tokamak Plasma Behavior and Machine Learning with Big Data

Rastovic¹

2017

IJMTP

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Theoretical interpretation of W soft X-ray spectra collected by the pulse height analysis system on Wendelstein 7-X stellarator

Syrocki,

Kubkowska,

Jabłoński

et al. 2024

Physics of Plasmas

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In many fusion devices, such as tokamaks or stellarators like Wendelstein 7-X (W7-X), soft x-ray pulse height analysis (PHA) system diagnostics are routinely used during the experiments. The PHA system is dedicated to providing information about the impurity content, and average along line-of-sight electron temperature in the plasma conditions. Moreover, it is also able to estimate impurity density and an average effective charge from the comparison of experimental spectra with the modeled ones. However, the experimental x-ray spectra can be interpreted in terms of interesting plasma parameters only when the theoretical radiation models first identify and then take into account all the relevant factors that affect the spectrum. Therefore, for this purpose, a theoretical model has been applied. Flexible Atomic Code, which allows for calculation of various atomic properties such as energy levels, cross sections for excitation and ionization by electron impact, transition probabilities for radiative transitions and autoionization, and any others as needed in the collisional–radiative approximation. The chosen spectra collected during the W7-X campaign (OP1.2b) were examined, trying to obtain an agreement between the observed and simulated spectra. The analysis carried out allowed for a reliable interpretation of experimental x-ray spectra, estimation of the electron temperature, and obtaining information on the content of tungsten impurities.

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Modeling of soft N, M and L X-ray lines from tungsten relevant to plasma parameters in the WEST tokamak

Cited by 2 publications

References 21 publications

Investigation of Stabilities and Instabilities at Tokamak Plasma Behavior and Machine Learning with Big Data

Investigation of Stabilities and Instabilities at Tokamak Plasma Behavior and Machine Learning with Big Data

Theoretical interpretation of W soft X-ray spectra collected by the pulse height analysis system on Wendelstein 7-X stellarator

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