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Communication Dans Un Congrès Année : 2017

Linear discriminant based prey-predator analysis of hot electron effects on the X-pinch produced K-shell Al plasmas

Résumé

Linear Discriminant Analysis (LDA) is applied to investigate the electron beam effects on the X-pinch produced K-shell Aluminum spectra. The radiating plasma is produced by the explosion of two 25-μm Al wires (XP622) on a compact L-C (40kV, 200kA and 200ns) generator and was analyzed using the full set of diagnostics: current signals by close-to-load B-dot probing, fast filtered PCDs, time-integrated x-ray pinhole imaging and time-integrated crystal spectrometry in the keV region. The electron temperature and density, and the hot electron beam fraction in the Al plasma, were extracted using coefficients of linear discriminant components derived from the non-LTE collisionally radiative K-shell Al model and compared with the ones obtained by principal component analysis method [1]. As a result, LDA can also be used for plasma diagnostics and can investigate the electron beam effects on the synthetic spectra, especially in the details of intercombination and dielectronic satellite lines of weak transitions. Linear discriminant vector spectra analysis shows that the weak transitions of Al He Ly and He to move in Langmuir wave type oscillations. A 3-D representation of linear discriminant analysis shows that the addition of a fraction of electrons in an energetic beam, reflects the quantized clusters as well as outward spiral turbulence. These spirals are modeled with logistic growth with predator called Predator-prey model. This modeling suggests that the electron beams and ions represent the preys and predator, respectively. The center region of the spirals has low temperatures (50-100 eV) but more stability in which the low ionization is fixed by the electron beams. Also not only LD [2] but also LD [3] coefficients obtained from LDA are used to estimate the temperature of a given test plasma which makes a significant improvement compare to due to the less information loss. The modeled plasma electron temperatures and densities are about Te = 75 eV and ne = 1x1019 cm-3 in the presence of electron beams with fraction of f = 0.2 and energy centered at 10 keV. oral presentation
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Dates et versions

hal-02894233 , version 1 (08-07-2020)

Identifiants

  • HAL Id : hal-02894233 , version 1

Citer

M. F. Yilmaz, Y. Danisman, Jean Larour, Léonid Arantchouk. Linear discriminant based prey-predator analysis of hot electron effects on the X-pinch produced K-shell Al plasmas. International Conference on Dense Z-Pinches, Aug 2017, Lake Tahoe, Nevada, United States. ⟨hal-02894233⟩
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